CN109828098B - Method and device for determining heterogeneous reservoir aggregation reservoir formation coefficient and storage medium - Google Patents
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Abstract
The application discloses a method and a device for determining a reservoir formation coefficient of a heterogeneous reservoir, and a storage medium, and belongs to the field of oil and gas exploration and development. The method comprises the following steps: a median depth of the heterogeneous reservoir is determined. And determining the lower reservoir porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir. And determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir. And obtaining the displacement pressure lower limit of the heterogeneous reservoir according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir. And determining the aggregation accumulation coefficient of the heterogeneous reservoir through the displacement pressure lower limit of the heterogeneous reservoir. The method and the device can determine the aggregation and reservoir formation coefficient of the heterogeneous reservoir, and improve the accuracy of the judgment result compared with the judgment of the difficulty degree of aggregation and reservoir formation through the lower limit of the displacement pressure of single lithology.
Description
Technical Field
The application relates to the field of oil and gas exploration and development, in particular to a method and a device for determining a heterogeneous reservoir aggregation reservoir formation coefficient and a storage medium.
Background
Petroleum and natural gas are indispensable strategic resources for national survival and development, and have immeasurable effect on guaranteeing national economic and social development and national defense safety. After oil and gas are produced from the source rock, they are transported into the reservoir and collected into a reservoir. Capillary force, the viscous force of rock and adsorption force can be used as the oil gas accumulation resistance, the capillary force is the main body of the accumulation resistance, and the larger the capillary force is, the larger the difficulty of oil gas accumulation is. Therefore, the determination of the capillary force is important for judging the possibility of oil and gas accumulation. In the past, the displacement pressure obtained by mercury intrusion experiment calculation is mostly adopted to represent the capillary force, and the larger the displacement pressure is, the larger the capillary force is. Due to limited experimental data, the calculated displacement pressure can only represent the displacement pressure at the sampling point or the displacement pressure of a single lithologic homogeneous reservoir. However, in an actual underground situation, the heterogeneous reservoir formed by lithology is the main body of the reservoir, so that the displacement pressure of the lithology heterogeneous reservoir represented by the displacement pressure of the lithology homogeneous reservoir is not accurate enough, the precision is not high enough, and the judgment on the possibility of oil gas gathering and storing is not accurate enough.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining the accumulation coefficient of a heterogeneous reservoir and a storage medium, and can solve the problem that the judgment of the possibility of oil gas accumulation is not accurate enough. The technical scheme is as follows:
in a first aspect, a method for determining the aggregation and reservoir formation coefficients of a heterogeneous reservoir is provided, the method comprising:
determining a median depth of the heterogeneous reservoir, wherein the median depth refers to the depth of a middle position of the thickness of the heterogeneous reservoir from the surface of the earth;
determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the single lithologies;
determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient;
performing weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir;
determining an aggregate-to-reserve coefficient of the heterogeneous reservoir from a lower drainage pressure limit of the heterogeneous reservoir, the aggregate-to-reserve coefficient being indicative of a difficulty of the aggregation of the heterogeneous reservoir to reserve.
Optionally, the determining, according to the median depth of the heterogeneous reservoir and the stored first type lithology coefficients of the plurality of single lithologies, a lower reservoir formation porosity limit of each single lithology reservoir in the heterogeneous reservoir includes:
for any single lithology reservoir A in the heterogeneous reservoir, obtaining a first lithology coefficient of the single lithology reservoir A from the stored first lithology coefficients of the single lithology;
determining a lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A by the following first formula;
the first formula: phin＝anln(H)+bn
Wherein, the phinRefers to the lower reservoir formation porosity limit of the single lithologic reservoir A, an、bnRefers to the first type lithology coefficient of the single lithology reservoir A, and the H refers to the median depth.
Optionally, the determining, according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient, a lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir includes:
for any single lithologic reservoir A in the heterogeneous reservoir, determining a displacement pressure lower limit of the single lithologic reservoir A according to a second formula below and according to a lower reservoir porosity limit of the single lithologic reservoir A and the stored second lithologic coefficient;
the second formula:
wherein, the PnThe lower displacement pressure limit of the single lithologic reservoir A is referred to, and the c and the d refer to the second type lithology coefficient.
Optionally, the performing a weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness ratio of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir includes:
determining the lower displacement pressure limit of the heterogeneous reservoir according to the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
third publicationFormula (II): p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P is the lower exclusion pressure limit of the heterogeneous reservoir, and P is1，P2，P3...PnAnd the lower displacement pressure limit of each single lithologic reservoir is obtained, and the X, Y, Z.
Optionally, the determining the aggregate pay-off coefficient of the heterogeneous reservoir from the drainage pressure lower limit of the heterogeneous reservoir comprises:
determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone
Wherein f is the aggregation reserve coefficient of the heterogeneous reservoir, P is the lower displacement pressure limit of the heterogeneous reservoir, and P isSandstoneRefers to the lower displacement pressure limit of the sandstone reservoir.
In a second aspect, there is provided an apparatus for determining the clustering bearing coefficients of heterogeneous reservoirs, the apparatus comprising:
the device comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for determining the median depth of the heterogeneous reservoir, and the median depth refers to the depth of the middle position of the thickness of the heterogeneous reservoir from the surface;
the second determination module is used for determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the single lithologies;
the third determination module is used for determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoirs according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoirs and the stored second lithologic coefficient;
the weighting operation module is used for carrying out weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir so as to obtain the displacement pressure lower limit of the heterogeneous reservoir;
a fourth determination module, configured to determine an aggregate pay-per-view coefficient of the heterogeneous reservoir from a drainage pressure lower limit of the heterogeneous reservoir, where the aggregate pay-per-view coefficient is used to indicate how easy the heterogeneous reservoir is to aggregate into a pay-per-view.
Optionally, the second determining module includes:
the obtaining sub-module is used for obtaining a first type lithology coefficient of any single lithology reservoir A in the heterogeneous reservoir from the stored first type lithology coefficients of the single lithology reservoirs A;
the first determination sub-module is used for determining a lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A through a first formula;
the first formula: phin＝anln(H)+bn
Wherein, the phinRefers to the lower reservoir formation porosity limit of the single lithologic reservoir A, an、bnRefers to the first type lithology coefficient of the single lithology reservoir A, and the H refers to the median depth.
Optionally, the third determining module includes:
the second determination sub-module is used for determining the displacement pressure lower limit of any single lithologic reservoir A in the heterogeneous reservoir according to the lower limit of the reservoir formation porosity of the single lithologic reservoir A and the stored second lithologic coefficient and according to the following second formula;
the second formula:
wherein, the PnThe lower displacement pressure limit of the single lithologic reservoir A is referred to, and the c and the d refer to the second type lithology coefficient.
Optionally, the weighting operation module includes:
the third determination sub-module is used for determining the displacement pressure lower limit of the heterogeneous reservoir according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
the third formula: p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P is the lower exclusion pressure limit of the heterogeneous reservoir, and P is1，P2，P3...PnAnd the lower displacement pressure limit of each single lithologic reservoir is obtained, and the X, Y, Z.
Optionally, the fourth determining module includes:
the fourth determination sub-module is used for determining the aggregation reservoir formation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone
Wherein f is the aggregation reserve coefficient of the heterogeneous reservoir, P is the lower displacement pressure limit of the heterogeneous reservoir, and P isSandstoneRefers to the lower displacement pressure limit of the sandstone reservoir.
In a third aspect, a computer-readable storage medium is provided, in which a computer program is stored, which, when executed by a processor, implements any of the methods provided in the first aspect above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise: in the embodiment of the application, for the heterogeneous reservoir, the reservoir formation porosity lower limit of each single lithologic reservoir in the heterogeneous reservoir may be determined first. And determining the lower displacement pressure limit of each single lithologic reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir and the stored second lithologic coefficient. And then, carrying out weighting operation according to the displacement pressure lower limit of each single lithologic reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir. In this way, the aggregate reservoir formation coefficient of the heterogeneous reservoir can be determined through the displacement pressure lower limit of the heterogeneous reservoir. That is, by the method provided by the application, the aggregation and reservoir formation coefficient of the heterogeneous reservoir can be determined, and the difficulty level of aggregation and reservoir formation can be further judged. Compared with the method for determining the difficulty degree of accumulation of a single lithologic reservoir only through a mercury intrusion experiment, the method provided by the application is wider in application range and more suitable for actual reservoir conditions. In addition, the aggregation accumulation coefficient enables a method of determining the difficulty level of aggregation accumulation to be quantified, and is more intuitive than a method of determining the difficulty level of aggregation accumulation by excluding the lower limit of pressure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining an aggregation reservoir formation factor of a heterogeneous reservoir according to an embodiment of the present application;
FIG. 2 is a flow chart of another method for determining the aggregation reservoir formation coefficients of a heterogeneous reservoir according to an embodiment of the present application;
FIG. 3 is a graph of porosity versus percent content provided by an example of the present application;
FIG. 4 is a schematic structural diagram of an apparatus for determining the aggregation and accumulation coefficients of a heterogeneous reservoir provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of another apparatus for determining the aggregation and accumulation coefficients of a heterogeneous reservoir provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining an aggregation reservoir formation coefficient of a heterogeneous reservoir according to an embodiment of the present application. The method is applied to the determination device of the heterogeneous reservoir aggregation reservoir coefficient, and the determination device of the heterogeneous reservoir aggregation reservoir coefficient can be a computer device. Referring to fig. 1, the method includes:
step 101: determining a median depth of the heterogeneous reservoir, wherein the median depth refers to the depth of a middle position of the thickness of the heterogeneous reservoir from the surface of the earth;
step 102: determining a reservoir formation porosity lower limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the single lithologicalities;
step 103: determining the lower limit of the displacement pressure of each single lithologic reservoir in the heterogeneous reservoir according to the lower limit of the reservoir forming porosity of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient;
step 104: performing weighted operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir;
step 105: and determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the displacement pressure lower limit of the heterogeneous reservoir, wherein the aggregation accumulation coefficient is used for indicating the difficulty degree of aggregation accumulation of the heterogeneous reservoir.
In the embodiment of the application, for the heterogeneous reservoir, the reservoir formation porosity lower limit of each single lithologic reservoir in the heterogeneous reservoir may be determined first. And determining the lower displacement pressure limit of each single lithologic reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir and the stored second lithologic coefficient. And then, carrying out weighting operation according to the displacement pressure lower limit of each single lithologic reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir. In this way, the aggregate reservoir formation coefficient of the heterogeneous reservoir can be determined through the displacement pressure lower limit of the heterogeneous reservoir. That is, by the method provided by the application, the aggregation and reservoir formation coefficient of the heterogeneous reservoir can be determined, and the difficulty level of aggregation and reservoir formation can be further judged. Compared with the method for determining the difficulty degree of accumulation of a single lithologic reservoir only through a mercury intrusion experiment, the method provided by the application is wider in application range and more suitable for actual reservoir conditions. In addition, the aggregation accumulation coefficient enables a method of determining the difficulty level of aggregation accumulation to be quantified, and is more intuitive than a method of determining the difficulty level of aggregation accumulation by excluding the lower limit of pressure.
Optionally, determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first lithologic coefficients of the plurality of single lithologies, including:
for any single lithology reservoir A in the heterogeneous reservoir, obtaining a first lithology coefficient of the single lithology reservoir A from the stored first lithology coefficients of the single lithology;
determining a lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A by the following first formula;
the first formula: phin＝anln(H)+bn
Wherein phinRefers to the lower reservoir porosity limit, a, of a single lithologic reservoir An、bnRefers to the first type lithology coefficient of a single lithology reservoir a, and H refers to the median depth.
Optionally, determining a lower drainage pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient, including:
for any single lithologic reservoir A in the heterogeneous reservoir, determining the lower displacement pressure limit of the single lithologic reservoir A according to the lower limit of the reservoir porosity of the single lithologic reservoir A and the stored second lithologic coefficient and the following second formula;
the second formula:
wherein, PnThe lower limit of the displacement pressure of the single lithologic reservoir A is indicated, and the c and the d are lithologic coefficients of the second type.
Optionally, performing a weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir, including:
determining the displacement pressure lower limit of the heterogeneous reservoir according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
the third formula: p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P is the lower exclusion pressure limit of the heterogeneous reservoir, P1，P2，P3...PnAnd the lower displacement pressure limit of each single lithologic reservoir, and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir.
Optionally, determining the aggregate pay-off coefficient of the heterogeneous reservoir from a lower drainage pressure limit of the heterogeneous reservoir comprises:
determining the aggregation reservoir formation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone
Wherein f is heterogeneousAggregate reservoir formation coefficient of a heterogeneous reservoir, P being the lower drainage pressure limit of the heterogeneous reservoir, PSandstoneRefers to the lower displacement pressure limit of a sandstone reservoir.
All the above optional technical solutions can be combined arbitrarily to form an optional embodiment of the present application, and the present application embodiment is not described in detail again.
Fig. 2 is a flowchart of another method for determining the aggregation reservoir formation coefficients of the heterogeneous reservoir according to the embodiment of the present application. The method is applied to a determination device for the heterogeneous reservoir aggregation reservoir coefficient, wherein the determination device for the heterogeneous reservoir aggregation reservoir coefficient can be a computer device, and referring to fig. 2, the method comprises the following steps:
step 201: determining a median depth of the heterogeneous reservoir, wherein the median depth refers to the depth of a middle position of the thickness of the heterogeneous reservoir from the surface.
Specifically, the thickness of the heterogeneous reservoir and the distance from the uppermost end of the heterogeneous reservoir to the ground surface are determined, and then the median depth of the heterogeneous reservoir is determined according to the thickness of the heterogeneous reservoir and the distance from the uppermost end of the heterogeneous reservoir to the ground surface. Assuming that the median depth of the heterogeneous reservoir is H, the thickness is T, and the distance from the uppermost end of the heterogeneous reservoir to the surface is L, the median depth of the heterogeneous reservoir may be represented by the following fifth formula:
the fifth formula:
step 202: and determining the lower reservoir porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first lithologic coefficients of the plurality of single lithologicalities.
In one possible implementation, determining a lower reservoir formation porosity limit of each single lithology reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first lithology coefficients of the plurality of single lithologies may be implemented by the following steps (1) - (2):
(1) and for any single lithology reservoir A in the heterogeneous reservoir, obtaining the first lithology coefficient of the single lithology reservoir A from the stored first lithology coefficients of the single lithology.
The first lithology coefficients of a plurality of single lithologies can be obtained in advance through experimental data derivation and stored in the device for determining the heterogeneous reservoir aggregation reservoir formation coefficients. In this way, for a single lithology reservoir a in the heterogeneous reservoir, the first lithology coefficient corresponding to the single lithology reservoir a may be selected from the stored first lithology coefficients of the plurality of single lithologies.
(2) And determining the lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A by the following first formula.
The first formula: phin＝anln(H)+bn
Wherein phinRefers to the lower reservoir porosity limit, a, of a single lithologic reservoir An、bnRefers to the first type lithology coefficient of a single lithology reservoir A, and H refers to the median depth.
In the first formula, the lithology coefficient of the first type a is due to the median depth Hn、bnAre all known, so H, a will ben、bnThe lower reservoir porosity limit phi of the single lithologic reservoir A can be determined by taking the first formulan。
Exemplarily, when the single lithologic reservoir a is sandstone, in the heterogeneous reservoir with the depth interval of 2035-2055m, because the first type lithology coefficient of sandstone is known as aSandstone、bSandstoneAnd a is aSandstone-8.93、b82.835 sandstoneThe median depth of the depth interval 2035-2055m is H-2045, and a isSandstone、bSandstoneAnd the value of H is substituted into the first formula, then: phiSandstone＝-8.93ln(2045)+82.835≈14.76(％)
It should be noted that, since the single lithologic reservoir a is a reservoir of any lithologic property in the heterogeneous reservoir, the lower reservoir porosity limit of the single lithologic reservoir a can be determined not only through the above steps (1) - (2), but also through the above steps (1) - (2), and the process for determining the lower reservoir porosity limit of other single lithologic reservoirs in the embodiments of the present application is not described in detail.
Typically, b in the lithology coefficients of the first type for each single lithology reservoirnMay not be very different, therefore, in another possible implementation, when determining the lower reservoir formation porosity limit of each single lithology reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first lithology coefficients of the plurality of single lithologies, b in the first lithology coefficients of each single lithology reservoir may be usednSet to the same value, that is, in this case, for any single lithology reservoir A in the heterogeneous reservoirs, only the median depth of the heterogeneous reservoir and a in the first type lithology coefficient of the single lithology reservoir A need be considerednBy the above first formula (in this case, b in the above first formula)nConstant), the lower reservoir formation porosity limit for a single lithologic reservoir a is determined.
In the embodiment of the present application, the lower reservoir porosity limit of each single lithologic reservoir in the heterogeneous reservoir may be determined not only by the above step 202, but also by other means. For example, the lower reservoir porosity limit for each single lithologic reservoir in the heterogeneous reservoir may be determined from the log data. Specifically, for any single lithologic reservoir a in the heterogeneous reservoir, the total volume of a plurality of first volumes and valid reservoirs in the single lithologic reservoir a and the total volume of a plurality of second volumes and invalid reservoirs may be obtained from the logging data, where the plurality of first volumes refer to the volume of partial reservoirs with porosity of a plurality of different first porosities in the valid reservoir of the single lithologic reservoir a, and the plurality of second volumes refer to the volume of partial reservoirs with porosity of a plurality of different second porosities in the invalid reservoir of the single lithologic reservoir a. Determining the percentage of the first volumes in the single lithologic reservoir A to the total volume of the effective reservoir to obtain a plurality of first percentages. Determining a percentage of the plurality of second volumes in the single lithologic reservoir a to the total volume of the ineffective reservoir to obtain a plurality of second percentages. And according to the plurality of first percentages, drawing a porosity curve corresponding to the effective reservoir in the single lithologic reservoir A in a porosity-percentage diagram. And according to the plurality of second percentages, drawing a porosity curve corresponding to the ineffective reservoir in the single lithologic reservoir A in a porosity-percentage diagram. And determining the porosity corresponding to the intersection point between the porosity curve corresponding to the effective reservoir and the porosity curve corresponding to the ineffective reservoir in the porosity-percentage content diagram as the lower reservoir formation porosity limit of the single lithologic reservoir A.
Wherein, an effective reservoir and an ineffective reservoir may exist in the single lithology reservoir, and different positions of the single lithology reservoir may have different porosities, so that a plurality of first volumes may be determined for the effective reservoir in the single lithology reservoir, and a plurality of second volumes may be determined for the ineffective reservoir in the single lithology reservoir. The effective reservoir is an oil layer, a gas layer, an oil-containing water layer, an oil-water layer, a poor oil layer and the like, and the ineffective reservoir is a dry layer.
For example, referring to fig. 3, in a heterogeneous reservoir with a depth of 2000-2200m, the porosities and the percentages of the effective reservoir and the ineffective reservoir of the single lithologic reservoir a are respectively projected onto the same porosity-percentage diagram, so as to obtain an intersection point, and the porosity corresponding to the intersection point is 15.6%, so that 15.6% is the lower limit of the reservoir-forming porosity of the single lithologic reservoir a.
Step 203: and determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient.
And for any single lithologic reservoir A in the heterogeneous reservoir, determining the lower displacement pressure limit of the single lithologic reservoir A according to the lower reservoir porosity limit of the single lithologic reservoir A and the stored second lithologic coefficient and the following second formula.
The second formula:
wherein, PnThe lower limit of the displacement pressure of the single lithologic reservoir A is indicated, and the c and the d are lithologic coefficients of the second type.
Because in the second formula, c and d refer to lithology coefficients of the second type, phinHaving determined so from step 202, c, d, and ΦnThe lower displacement pressure limit P of the single lithologic reservoir A can be determined by taking the second formulan。
Exemplarily, when the single lithologic reservoir a is sandstone, in a heterogeneous reservoir with a depth interval of 2035-SandstoneHaving determined in step (2), the value ΦSandstone14.76%, so according to the second equation, one can obtain:
Psandstone＝35.794e-0.212*14.76≈1.566(MPa)
In general, in the heterogeneous reservoir, the second lithology coefficients c and d are both used as a constant, however, in practical cases, the second lithology coefficients of each single lithology reservoir in the heterogeneous reservoir may be slightly different, that is, each single lithology reservoir corresponds to a group of second lithology coefficients, respectively, so that, in order to make the precision of the lower displacement pressure limit of the single lithology reservoir a higher, in another possible implementation manner, when the lower displacement pressure limit of the single lithology reservoir a is determined according to the lower reservoir formation porosity limit of the single lithology reservoir a and the stored second lithology coefficients and according to the second formula, the corresponding second lithology coefficients of the single lithology reservoir a may be fitted to the single lithology reservoir a, and then the fitted second lithology coefficients are substituted into the second formula to obtain the lower displacement pressure limit of the single lithology reservoir a, the accuracy of the lower limit of the displacement pressure thus obtained is higher.
When the second type lithology coefficient corresponding to the single lithology reservoir is fitted, the lower limit of the drainage pressure of the single lithology obtained by mercury intrusion test is taken as a vertical axis, the lower limit of the reservoir porosity of the single lithology is taken as a horizontal axis, the lower limit of the drainage pressure of the single lithology corresponding to different depths and the lower limit of the reservoir porosity of the single lithology are respectively projected into a lower limit diagram of the drainage pressure,by fitting a curve to the projection points in the displacement pressure lower limit diagram, a form is obtained
Wherein the constants at the c and d positions are the second lithology coefficients corresponding to the single lithology reservoir A.
The lower limit of the displacement pressure is a graph with the lower limit of the displacement pressure of single lithology obtained in a mercury intrusion test as a vertical axis and the lower limit of the reservoir porosity of single lithology as a horizontal axis.
It should be noted that, since the single lithology reservoir a is a reservoir of any lithology in the heterogeneous reservoirs, the displacement pressure lower limit of the single lithology reservoir a may be determined not only through the step 203, but also through the step 203, and the determination process of the displacement pressure lower limit of the other single lithology reservoir is not described in detail in this embodiment of the application.
Step 204: and performing weighted operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir.
Specifically, for each single lithologic reservoir in the heterogeneous reservoir, a lower drainage pressure limit for the single lithologic reservoir is determined, and the product of the thickness fraction of the single lithologic reservoir in the heterogeneous reservoir. Thus, for a plurality of single lithologic reservoirs in the heterogeneous reservoir, a plurality of products are obtained, and the sum of the products is determined as the lower displacement pressure limit of the heterogeneous reservoir.
The heterogeneous reservoir comprises three single lithologic reservoirs, and the lower displacement pressure limits of the three single lithologic reservoirs are respectively P1、P2And P3The thickness ratio of the three single lithologic reservoirs to the heterogeneous reservoir is X, Y and Z, so that the lower displacement pressure limit P of the heterogeneous reservoir can be expressed by the following third formula:
P＝XP1+YP2+ZP3
wherein X + Y + Z is 1
It should be noted that the heterogeneous reservoir may include reservoirs with multiple lithologies, that is, includes multiple single lithology reservoirs, each single lithology reservoir has a certain thickness, and the sum of the thicknesses of the single lithology reservoirs is equal to the total thickness of the heterogeneous reservoir, that is, the sum of the thicknesses of the single lithology reservoirs in proportion to the total thickness of the heterogeneous reservoir is 1.
Step 205: and determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the displacement pressure lower limit of the heterogeneous reservoir, wherein the aggregation accumulation coefficient is used for indicating the difficulty degree of aggregation accumulation of the heterogeneous reservoir.
Since sandstone reservoirs are usually ideal reservoirs, the lower drainage pressure limit P of a nonhomogeneous reservoir and the lower drainage pressure limit P of a sandstone reservoir are usually usedSandstoneThe ratio of (a) to (b), as an aggregation-to-pool coefficient indicating the heterogeneous reservoir, the aggregation-to-pool coefficient indicating how easy the heterogeneous reservoir is aggregated to pool, can be expressed by a fourth formula:
f＝P/Psandstone
f is the aggregation and accumulation coefficient of the heterogeneous reservoir, when f is larger than 1, the possibility of oil and gas aggregation and accumulation is low, and when f is smaller than 1, the possibility of oil and gas aggregation and accumulation is high.
Exemplarily, the heterogeneous reservoir with the depth interval of 2035-2055m comprises three reservoirs of conglomerate, sandstone and siltstone, the thickness ratios of the three reservoirs to the heterogeneous reservoir are respectively 0.11, 0.75 and 0.14, and the first lithology coefficients of the conglomerate, the sandstone and the siltstone are respectively aConglomerate-8.77、bConglomerate 86.557，aSandstone-8.93、b82.835 sandstone，aSiltstone-8.86 ═、b81.658-powdered sandstoneThe second lithology coefficient of the heterogeneous reservoir is c-35.794, d-0.212, and the median depth H of the heterogeneous reservoir is 2045, so that the first formula Φ is usedn＝anln(H)+bnTherefore, the following steps are carried out:
Φconglomerate＝-8.77ln(2045)+86.557≈19.70(％)
ΦSandstone＝-8.93ln(2045)+82.835≈14.76(％)
ΦSiltstone＝-8.86ln(2045)+81.658≈14.11(％)
According to a second formula
Therefore, the following steps are carried out:
Pconglomerate＝35.794e-0.212*19.70≈0.550(MPa)
PSandstone＝35.794e-0.212*14.76≈1.566(MPa)
PSiltstone＝35.794e-0.212*14.11≈1.798(MPa)
According to a third formula P ═ XP1+YP2+ZP3It can be seen that the lower exclusion pressure limit P of the heterogeneous reservoir:
P＝0.11*0.550+0.75*1.566+0.14*1.798≈1.487
according to a fourth formula f ═ P/PSandstoneA 1 is to PSandstoneAnd P is substituted into the fourth formula to know:
f＝1.487/1.566≈0.95
because the aggregation accumulation coefficient f ≈ 0.95 is less than 1, the probability that the heterogeneous reservoir is aggregated into the accumulation is judged to be high.
In the embodiment of the application, first, the lower reservoir porosity limit of each single lithologic reservoir in the heterogeneous reservoir is determined. And determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient. And then, performing weighted operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir. And finally, determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the displacement pressure lower limit of the heterogeneous reservoir. Compared with the method which can only be applied to a single lithologic reservoir and judges the difficulty of the accumulation of the reservoir through mercury intrusion experiments, the method which judges the difficulty of the accumulation of the reservoir through determining the lower limit of the displacement pressure of the heterogeneous reservoir has wider application range and better accords with the actual reservoir condition. In addition, the aggregation accumulation coefficient enables a method of determining the difficulty level of aggregation accumulation to be quantified, and is more intuitive than a method of determining the difficulty level of aggregation accumulation by excluding the lower limit of pressure.
Referring to fig. 4, the present application provides an apparatus for determining a reservoir formation coefficient of heterogeneous reservoirs, which includes a first determining module 401, a second determining module 402, a third determining module 403, a weighting operation module 404, and a fourth determining module 405.
The first determining module 401 is configured to determine a median depth of the heterogeneous reservoir, where the median depth is a depth from a middle position of a thickness of the heterogeneous reservoir to a surface of the earth;
a second determining module 402, configured to determine a lower reservoir formation porosity limit of each single lithology reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first lithology coefficients of the plurality of single lithologies;
a third determining module 403, configured to determine a displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower limit of the reservoir formation porosity of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient;
the weighting operation module 404 is configured to perform weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness ratio of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir, so as to obtain the displacement pressure lower limit of the heterogeneous reservoir;
a fourth determination module 405, configured to determine an aggregate-to-reserve coefficient of the heterogeneous reservoir according to a displacement pressure lower limit of the heterogeneous reservoir, where the aggregate-to-reserve coefficient is used to indicate how easy the heterogeneous reservoir is to aggregate into a reserve.
Optionally, the second determining module includes:
the acquisition sub-module is used for acquiring a first lithology coefficient of a single lithology reservoir A from the stored first lithology coefficients of a plurality of single lithologies for any single lithology reservoir A in the heterogeneous reservoir;
the first determining sub-module is used for determining the lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A through a first formula;
the first formula: phin＝anln(H)+bn
Wherein phinRefers to the lower reservoir porosity limit, a, of a single lithologic reservoir An、bnRefers to the first type lithology coefficient of a single lithology reservoir A, and H refers to the median depth.
Optionally, the third determining module includes:
the second determination sub-module is used for determining the displacement pressure lower limit of any single lithologic reservoir A in the heterogeneous reservoir according to the lower limit of the reservoir forming porosity of the single lithologic reservoir A and the stored second lithologic coefficient and a second formula;
the second formula:
wherein, PnThe lower limit of the displacement pressure of the single lithologic reservoir A is indicated, and the c and the d are lithologic coefficients of the second type.
Optionally, the weighting operation module includes:
the third determination sub-module is used for determining the displacement pressure lower limit of the heterogeneous reservoir according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
the third formula: p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P refers to the lower displacement pressure limit of the heterogeneous reservoir,P1，P2，P3...Pnand N is the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir.
Optionally, the fourth determining module includes:
the fourth determination sub-module is used for determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone
Wherein f is the aggregation accumulation coefficient of the heterogeneous reservoir, P is the lower limit of the displacement pressure of the heterogeneous reservoir, and P is the lower limit of the displacement pressure of the heterogeneous reservoirSandstoneRefers to the lower displacement pressure limit of a sandstone reservoir.
In summary, in the embodiment of the present application, first, the lower reservoir porosity limit of each single lithologic reservoir in the heterogeneous reservoir is determined. And determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient. And then, performing weighted operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir. And finally, determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the displacement pressure lower limit of the heterogeneous reservoir. Compared with the method which can only be applied to a single lithologic reservoir and judges the difficulty of the accumulation of the reservoir through mercury intrusion experiments, the method which judges the difficulty of the accumulation of the reservoir through determining the lower limit of the displacement pressure of the heterogeneous reservoir has wider application range and better accords with the actual reservoir condition. In addition, the aggregation accumulation coefficient enables a method of determining the difficulty level of aggregation accumulation to be quantified, and is more intuitive than a method of determining the difficulty level of aggregation accumulation by excluding the lower limit of pressure.
It should be noted that: the device for determining heterogeneous reservoir aggregation reservoir formation coefficients provided in the above embodiment is only illustrated by the division of the above functional modules when determining the heterogeneous reservoir aggregation reservoir formation coefficients, and in practical applications, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the determination device for the heterogeneous reservoir aggregation reservoir formation coefficient and the determination method embodiment for the heterogeneous reservoir aggregation reservoir formation coefficient provided in the above embodiments belong to the same concept, and the specific implementation process thereof is described in the method embodiment and is not described herein again.
Fig. 5 is a schematic structural diagram of another apparatus for determining heterogeneous reservoir aggregation reservoir coefficients, according to an embodiment of the present disclosure, where the apparatus 500 for determining heterogeneous reservoir aggregation reservoir coefficients may generate relatively large differences due to different configurations or performances, and may include one or more processors (CPUs) 501 and one or more memories 502, where the memory 502 stores at least one instruction, and the at least one instruction is loaded and executed by the processor 501. Certainly, the determining apparatus 500 for heterogeneous reservoir aggregation pooling coefficients may further include a wired or wireless network interface, a keyboard, an input/output interface, and other components, so as to perform input and output, and the determining apparatus 500 for heterogeneous reservoir aggregation pooling coefficients may further include other components for implementing device functions, which is not described herein again.
In an exemplary embodiment, a computer-readable storage medium, such as a memory, including instructions executable by a processor in the computer device to perform the method of predicting oil production in the above embodiments is also provided. For example, the computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. A method for determining the aggregate bearing coefficients of heterogeneous reservoirs, the method comprising:
determining a median depth of the heterogeneous reservoir, wherein the median depth refers to the depth of a middle position of the thickness of the heterogeneous reservoir from the surface of the earth;
determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the single lithologies;
determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient;
performing weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to obtain the displacement pressure lower limit of the heterogeneous reservoir;
determining an aggregate-to-reserve coefficient of the heterogeneous reservoir from a drainage pressure lower limit of the heterogeneous reservoir, the aggregate-to-reserve coefficient being indicative of a difficulty of the aggregation of the heterogeneous reservoir to reserve;
wherein the determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the plurality of single lithologies comprises:
for any single lithology reservoir A in the heterogeneous reservoir, obtaining a first lithology coefficient of the single lithology reservoir A from the stored first lithology coefficients of the single lithology;
determining a lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A by the following first formula;
the first formula: phin＝anln(H)+bn；
Wherein, the phinRefers to the lower reservoir formation porosity limit of the single lithologic reservoir A, an、bnRefers to the first type lithology coefficient of the single lithology reservoir A, and the H refers to the median depth;
determining a replacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir according to the lower limit of the reservoir formation porosity of each single lithologic reservoir in the heterogeneous reservoir and the stored second lithologic coefficient, wherein the determining comprises:
for any single lithologic reservoir A in the heterogeneous reservoir, determining a displacement pressure lower limit of the single lithologic reservoir A according to a second formula below and according to a lower reservoir porosity limit of the single lithologic reservoir A and the stored second lithologic coefficient;
the second formula:
wherein, the PnThe lower displacement pressure limit of the single lithologic reservoir A is referred to, and the c and the d are the lithologic coefficients of the second type;
the determining the aggregate pay-off coefficient of the heterogeneous reservoir from the lower drainage pressure limit of the heterogeneous reservoir comprises:
determining the aggregation accumulation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone；
Wherein f is the aggregation reserve coefficient of the heterogeneous reservoir, P is the lower displacement pressure limit of the heterogeneous reservoir, and P isSandstoneRefers to the lower displacement pressure limit of the sandstone reservoir.
2. The method of claim 1, wherein the performing a weighted operation according to the lower drainage pressure limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness ratio of each single lithologic reservoir in the heterogeneous reservoir to obtain the lower drainage pressure limit of the heterogeneous reservoir comprises:
determining the lower displacement pressure limit of the heterogeneous reservoir according to the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
the third formula: p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P is the lower exclusion pressure limit of the heterogeneous reservoir, and P is1，P2，P3...PnAnd the lower displacement pressure limit of each single lithologic reservoir is obtained, and the X, Y, Z.
3. An apparatus for determining the concentration coefficients of heterogeneous reservoirs, the apparatus comprising:
the device comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for determining the median depth of the heterogeneous reservoir, and the median depth refers to the depth of the middle position of the thickness of the heterogeneous reservoir from the surface;
the second determination module is used for determining a lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoir according to the median depth of the heterogeneous reservoir and the stored first type lithologic coefficients of the single lithologies;
the third determination module is used for determining the lower displacement pressure limit of each single lithologic reservoir in the heterogeneous reservoirs according to the lower reservoir formation porosity limit of each single lithologic reservoir in the heterogeneous reservoirs and the stored second lithologic coefficient;
the weighting operation module is used for carrying out weighting operation according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir so as to obtain the displacement pressure lower limit of the heterogeneous reservoir;
a fourth determination module, configured to determine an aggregate pay-per-view coefficient of the heterogeneous reservoir from a drainage pressure lower limit of the heterogeneous reservoir, the aggregate pay-per-view coefficient being indicative of a difficulty of the heterogeneous reservoir in aggregating into a pay-per-view;
wherein the second determining module comprises:
the obtaining sub-module is used for obtaining a first type lithology coefficient of any single lithology reservoir A in the heterogeneous reservoir from the stored first type lithology coefficients of the single lithology reservoirs A;
the first determination sub-module is used for determining a lower reservoir formation porosity limit of the single lithologic reservoir A according to the median depth of the heterogeneous reservoir and the first lithologic coefficient of the single lithologic reservoir A through a first formula;
the first formula: phin＝anln(H)+bn；
Wherein, the phinRefers to the lower reservoir formation porosity limit of the single lithologic reservoir A, an、bnRefers to the first type lithology coefficient of the single lithology reservoir A, and the H refers to the median depth;
the third determining module includes:
the second determination sub-module is used for determining the displacement pressure lower limit of any single lithologic reservoir A in the heterogeneous reservoir according to the lower limit of the reservoir formation porosity of the single lithologic reservoir A and the stored second lithologic coefficient and according to the following second formula;
the second formula:
wherein, the PnThe lower displacement pressure limit of the single lithologic reservoir A is referred to, and the c and the d are the lithologic coefficients of the second type;
the fourth determining module includes:
the fourth determination sub-module is used for determining the aggregation reservoir formation coefficient of the heterogeneous reservoir according to the lower displacement pressure limit of the heterogeneous reservoir and the lower displacement pressure limit of the sandstone reservoir and the following fourth formula;
the fourth formula: f is P/PSandstone；
Wherein f is the aggregation reserve coefficient of the heterogeneous reservoir, P is the lower displacement pressure limit of the heterogeneous reservoir, and P isSandstoneRefers to the lower displacement pressure limit of the sandstone reservoir.
4. The apparatus of claim 3, wherein the weighting operation module comprises:
the third determination sub-module is used for determining the displacement pressure lower limit of the heterogeneous reservoir according to the displacement pressure lower limit of each single lithologic reservoir in the heterogeneous reservoir and the thickness proportion of each single lithologic reservoir in the heterogeneous reservoir to the heterogeneous reservoir by the following third formula;
the third formula: p ═ XP1+YP2+ZP3+...+NPn(X+Y+Z+...+N＝1)
Wherein P is the lower exclusion pressure limit of the heterogeneous reservoir, and P is1，P2，P3...PnAnd the lower displacement pressure limit of each single lithologic reservoir is obtained, and the X, Y, Z.
5. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1-2.
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