CN114382460B - Logging evaluation method and device for low-permeability and tight gas reservoir water outlet result - Google Patents
Logging evaluation method and device for low-permeability and tight gas reservoir water outlet result Download PDFInfo
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Abstract
The embodiment of the invention discloses a logging evaluation method and device for a water outlet result of a hypotonic tight gas reservoir. Wherein the method comprises the following steps: determining pore structure parameters, strongly-bound water saturation and weakly-bound water saturation of at least one core sample in a target formation; determining the strong irreducible water saturation change trend and the weak irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation, the weak irreducible water saturation and the pore structure parameters of each core sample; and determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum. By executing the technical scheme provided by the embodiment of the invention, the fine explanation and evaluation of the hypotonic and compact gas reservoirs can be realized, and the method has important guiding significance for the production and development of the gas reservoirs, thereby improving the economic benefit.
Description
Technical Field
The embodiment of the invention belongs to the technical field of oil and gas exploration, and particularly relates to a logging evaluation method and device for a water outlet result of a hypotonic tight gas reservoir.
Background
With the increase of the social and economic development on the energy demand and the increase of the strategic success difficulty of the conventional oil gas resources, the exploration and development of the unconventional oil gas resources become the main melody of the post oil gas era, and the hypotonic and compact gas reservoir occupies an extremely important position in the unconventional oil gas.
However, due to factors such as complex mineral components of reservoirs of hypotonic and compact gas reservoirs, generally large burial depth, complex diagenetic reconstruction effect and the like, the hypotonic and compact gas reservoirs have the characteristics of poor physical development, strong heterogeneity, complex pore structures and the like, and quantitative evaluation on fluid components of the hypotonic and compact gas reservoirs is not available in the prior art, so that water outlet phenomena with different degrees are easy to occur in the production and development processes of the hypotonic and compact gas reservoirs, the life cycle of the gas reservoirs is shortened, and the economic benefit is drastically reduced.
Disclosure of Invention
The embodiment of the invention provides a logging evaluation method and a logging evaluation device for the water outlet result of a hypotonic and compact gas reservoir, which can realize the fine interpretation evaluation of the hypotonic and compact gas reservoir, have important guiding significance for the production and development of the gas reservoir, and further can improve the economic benefit.
In a first aspect, an embodiment of the present invention provides a logging evaluation method for a water output result of a hypotonic tight gas reservoir, where the method includes:
Determining pore structure parameters, strongly-bound water saturation and weakly-bound water saturation of at least one core sample in a target formation; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
Determining a strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
Determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend, the weak-constraint water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
In a second aspect, an embodiment of the present invention further provides a logging evaluation device for a water outlet result of a hypotonic tight gas reservoir, where the device includes: the rock core sample information determining module is used for determining pore structure parameters, strong irreducible water saturation and weak irreducible water saturation of at least one rock core sample in the target stratum; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
The irreducible water saturation change trend determining module is used for determining the strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining the weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
The water outlet result determining module is used for determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
one or more processors;
storage means for storing one or more programs,
When the one or more programs are executed by the one or more processors, the one or more processors implement a logging evaluation method for the water output of the hypotonic tight gas reservoir according to any one of the embodiments of the present invention.
In a fourth aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a logging evaluation method for the water production results of a hypotonic, tight gas reservoir according to any of the embodiments of the present invention.
According to the technical scheme provided by the embodiment of the invention, the pore structure parameter, the strong irreducible water saturation and the weak irreducible water saturation of at least one core sample in a target stratum are determined; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir; determining a strong-constraint water saturation change trend of the target stratum according to the strong-constraint water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak-constraint water saturation change trend of the target stratum according to the weak-constraint water saturation of each core sample and the pore structure parameter of each core sample; determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend of the target stratum and the weak-constraint water saturation change trend of the target stratum; the change trend of the water saturation of the target stratum is determined by the airtight coring saturation of each core sample. By executing the technical scheme provided by the embodiment of the invention, the fine explanation and evaluation of the hypotonic and compact gas reservoirs can be realized, and the method has important guiding significance for the production and development of the gas reservoirs, thereby improving the economic benefit.
Drawings
FIG. 1 is a flow chart of a logging evaluation method for the water output result of a hypotonic tight gas reservoir provided by an embodiment of the invention;
FIG. 2 is a flow chart of another well logging evaluation method for low permeability, tight gas reservoir drainage results provided by embodiments of the present invention;
FIG. 3 is a schematic diagram of a multi-stage centrifugal force nuclear magnetic T2 spectrum of a core sample of a formation according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a strongly bound water limit model and a weakly bound water limit model of a formation provided by an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a logging evaluation device for the water output result of a hypotonic tight gas reservoir according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a flowchart of a logging evaluation method for a low permeability and tight gas reservoir water output result, where the method may be performed by a logging evaluation device for a low permeability and tight gas reservoir water output result, and the device may be implemented in software and/or hardware, and the device may be configured in an electronic device for logging evaluation of a low permeability and tight gas reservoir water output result. The method is applied to the scene of fine quantitative evaluation of the components of the hypotonic and compact gas reservoir fluid. As shown in fig. 1, the technical solution provided by the embodiment of the present invention specifically includes:
And S110, determining pore structure parameters, strong irreducible water saturation and weak irreducible water saturation of at least one core sample in the target stratum.
Wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir.
The target stratum can be a stratum of the whole well section, the type of the target stratum can be a conventional reservoir in the hypotonic-tight gas reservoir, the type of the target stratum can also be a hypotonic reservoir in the hypotonic-tight gas reservoir, and the type of the target stratum can also be a tight reservoir in the hypotonic-tight gas reservoir. The target formation is composed of a plurality of core samples, and the scheme can determine the pore structure parameter, the strong irreducible water saturation and the weak irreducible water saturation of at least one core sample in the target formation. According to the technical scheme, physical experiments are carried out on collected core samples, the core porosity and permeability of each core sample can be determined, experimental data such as core analysis porosity and permeability are used as calibration in combination with actual geological profiles of research areas, a high-precision porosity and permeability calculation model is built, and the square root of the ratio of the permeability of each core sample to the core porosity is calculated to determine pore structure parameters of each core sample. The strong and weak irreducible water saturation of each core sample may be determined by determining the strong capillary pressure and the weak capillary pressure of each core sample after saturated water treatment by using a multistage centrifugal force nuclear magnetic experiment, taking the average value of each strong capillary pressure as the average strong capillary pressure of each core sample, taking the average value of each weak capillary pressure as the average weak capillary pressure of each core sample, and determining by using the capillary pressure curve of each core sample, the average strong capillary pressure of each core sample and the average weak capillary pressure of each core sample determined by the capillary pressure experiment.
And S120, determining the strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining the weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample.
Specifically, the method can construct a power function relation between the strong irreducible water saturation of each core sample and pore structure parameters corresponding to each core sample, fit a strong irreducible water limit model of a target stratum, and determine the strong irreducible water saturation change trend of the target stratum according to the strong irreducible water limit model. And the weak irreducible water saturation of each core sample and the pore structure parameters corresponding to each core sample can be constructed into a power function relation, a weak irreducible water limit model of the target stratum is fitted, and the weak irreducible water saturation change trend of the target stratum is determined according to the weak irreducible water limit model.
And S130, determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum.
The water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
According to the method, the water saturation of each core sample can be determined, the actual geological profile of a research area is combined, core analysis closed coring saturation experimental data are used as calibration, a high-precision water saturation calculation model is built based on the calibrated water saturation of each core sample, and then the water saturation change trend of a target stratum is determined. The water production results of the target formation may be a fine assessment of the fluid composition developed by the target formation gas reservoir and a water production prediction. For example, the target formation may range from how deep to how many meters, whether it is a pure gas formation or a water-bearing gas formation. If the target formation is a hydrocarbon bearing formation, the target formation is composed of what types of water, e.g., whether the target formation is composed of strongly bound water and weakly bound water, or is composed of strongly bound water, weakly bound water, and free water, each type of water is in what proportion. Wherein, for a core of saturated water, the water components can be classified into three categories by flowability: strongly bound water, weakly bound water, and free water. The strongly bound water refers to bound water which is endowed inside the micropore throat, inside the clay and on the surface of the rock particles, the amount of the strongly bound water component is related to the pore structure, and the component is not movable; the weakly bound water refers to water components in medium holes, corners and pore throats with poor connectivity, in an actual gas reservoir, the quantity of the weakly bound water components is influenced by pore structures and reservoir forming power, and when the production pressure difference is larger than the reservoir forming power, the components can be produced together with natural gas to cause gas reservoir water outflow; free water refers to the water component which is endowed with good connectivity and is in the inter-particle pores and the coarse throat, and the water component can flow freely under a small pressure difference.
Hypotonic, dense gas occupies an extremely important place in unconventional oil and gas, which is defined as natural gas reservoirs that are assigned to low pore-hypotonic and even dense sandstone reservoirs, and that have no or very low natural capacity, and that require fracturing or special means to form an industrial gas stream. Due to the factors of complex mineral components of reservoirs, large burial depth, complex diagenetic reconstruction effect and the like, the hypotonic and compact gas reservoirs have the characteristics of poor physical property development, strong heterogeneity, complex pore structure and the like, so that the problems of reservoir omission, pores, seepage, inaccurate saturation calculation, difficult physical property lower limit, difficult fluid identification, difficult fluid component quantitative evaluation method to be innovated and determined and the like exist in well logging interpretation evaluation, meanwhile, water outlet phenomena with different degrees are extremely easy to occur in the production and development processes of the hypotonic and compact gas reservoirs, the life cycle of the gas reservoirs is shortened, and the economic benefit is rapidly reduced.
According to the technical scheme provided by the embodiment of the invention, the pore structure parameter, the strong irreducible water saturation and the weak irreducible water saturation of at least one core sample in a target stratum are determined; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir; determining a strong-constraint water saturation change trend of the target stratum according to the strong-constraint water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak-constraint water saturation change trend of the target stratum according to the weak-constraint water saturation of each core sample and the pore structure parameter of each core sample; determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend of the target stratum and the weak-constraint water saturation change trend of the target stratum; the change trend of the water saturation of the target stratum is determined by the airtight coring saturation of each core sample. By executing the technical scheme provided by the embodiment of the invention, the fine explanation and evaluation of the hypotonic and compact gas reservoirs can be realized, and the method has important guiding significance for the production and development of the gas reservoirs, thereby improving the economic benefit.
Fig. 2 is a flowchart of a logging evaluation method for a drainage result of a hypotonic and tight gas reservoir according to an embodiment of the present invention, which is optimized based on the above embodiment. As shown in fig. 2, the logging evaluation method of the water output result of the hypotonic tight gas reservoir in the embodiment of the invention may include:
and S210, determining pore structure parameters, strong irreducible water saturation and weak irreducible water saturation of at least one core sample in the target stratum.
In this embodiment, optionally, the determining process of the strong irreducible water saturation and the weak irreducible water saturation includes: determining the average strong capillary pressure and the average weak capillary pressure of each core sample; and determining the strong irreducible water saturation of each core sample under the average strong capillary pressure and the weak irreducible water saturation under the average weak capillary pressure by adopting a capillary pressure experiment.
For example, the capillary pressure curve of each core sample can be determined by using a capillary pressure experiment in the scheme. The capillary pressure curve of the core sample can reflect the corresponding relation between the irreducible water saturation of the core sample and each capillary pressure. Therefore, assuming that the average strong capillary pressure determined by the scheme is 300Psi and the average weak capillary pressure is 100Psi, the scheme can determine the strong irreducible water saturation of each core sample at 300Psi and the weak irreducible water saturation of each core sample at 100 Psi.
According to the technical scheme, capillary pressure experiments can be carried out after all core samples are subjected to saturated water treatment, so that capillary pressure curves of the core samples are obtained. There are three methods for capillary pressure measurement: a baffle method, a mercury-pressing method, and a centrifugation method. The three methods have advantages and disadvantages, and a proper method is selected according to actual conditions when the capillary pressure is measured. Compared with other two methods, the baffle method experiment is closer to the actual gas reservoir wetting condition, but the maximum breakthrough pressure of the common pore baffle is only 0.25MPa, and the common capillary pressure in the actual hypotonic and compact gas reservoir is not reached. Because mercury-air wetting systems are used in mercury-pressing methods, mercury-pressing capillary pressures are converted into corresponding gas-water wetting systems for gas reservoirs prior to use. However, because the interfacial tension of the fluid and the wetting contact angle in the actual gas reservoir are difficult to determine, and the existence of the clay binding water in the hypotonic and compact gas reservoirs has a great influence on the capillary pressure curve, the capillary pressure obtained by converting the mercury-pressing capillary pressure curve has a certain error with the capillary pressure of the actual gas reservoir. Centrifugal capillary pressure measurement has a faster efficiency than the baffle method, but is not suitable for measuring rock samples with strong heterogeneity. After the core capillary pressure curve is obtained, the strong capillary pressure and the weak capillary pressure with specific sizes are calibrated according to actual production test data and a multistage centrifugal force nuclear magnetic experiment.
Thus, the average strong capillary pressure and the average weak capillary pressure of each core sample are determined; the capillary pressure experiment is adopted to determine the strong irreducible water saturation of each core sample under the average strong capillary pressure and the weak irreducible water saturation under the average weak capillary pressure, so that the interpretation and evaluation of the strong irreducible water saturation and the weak irreducible water saturation can be realized, reliable data sources are provided for determining the strong irreducible water saturation change trend and the weak irreducible water saturation change trend of the target stratum, and further, the accurate water outlet result of the target stratum can be helped to be determined.
In this embodiment, optionally, determining the average strong capillary pressure and the average weak capillary pressure of each core sample includes: determining the strong capillary pressure and the weak capillary pressure of each core sample after saturated water treatment by adopting a multistage centrifugal force nuclear magnetic experiment; taking the average value of the strong capillary pressure as the average strong capillary pressure of each core sample; the average value of the weak capillary pressure is taken as the average weak capillary pressure of each core sample.
As shown in fig. 3, the present solution may perform a multi-stage centrifugal force nuclear magnetic resonance experiment on each core sample, and measure the nuclear magnetic T2 spectrum of each core sample under the condition of saturated water and after centrifugal force displacement of 50, 100, 150, 200, 250, 300, 400, 500Psi, respectively. The change in the T2 spectrum was observed as follows: as the displacement differential pressure increases, the peak area of the T2 spectrum of the core sample shows a significant decrease. At small differential pressure displacements, there is a significant decrease in the T2 spectrum signal above the cutoff value. As the displacement pressure differential increases to 100-150 Psi, the T2 spectrum above the cutoff has been substantially signal free, and the T2 spectrum signal below the cutoff has been attenuated to a different extent. And the core sample is proved to be preferentially discharged under the action of small displacement pressure difference, the signals of the core magnetic T2 spectrum larger than the cut-off value are rapidly weakened, and a small amount of weakly bound water components are discharged. As the displacement pressure differential further increases, the weakly bound water component is further expelled and the signal for the nuclear magnetic T2 spectrum less than the cutoff decreases. After the displacement pressure difference reaches 300Psi, the nuclear magnetism T2 spectrum is basically unchanged, and the T2 spectrum signal reflects the strongly bound water component. Thus, the displacement differential pressure when the nuclear magnetic T2 spectrum signal of each core sample greater than the cutoff value is attenuated to be substantially no signal is counted, and the critical displacement differential pressure (i.e., the weak capillary pressure) of a plurality of core samples is averaged and calibrated to be the average weak capillary pressure P1, for example, 100Psi. The displacement pressure difference (i.e., the strong capillary pressure) when the nuclear magnetic T2 spectrum of each core sample is substantially unchanged as a whole is averaged and calibrated to be the average strong capillary pressure P2, e.g., 300Psi.
The strong capillary pressure and the weak capillary pressure of each core sample after saturated water treatment are determined by adopting a multistage centrifugal force nuclear magnetic experiment; taking the average value of the strong capillary pressure as the average strong capillary pressure of each core sample; the average value of the weak capillary pressure is taken as the average weak capillary pressure of each core sample. The method can provide reliable data sources for determining the strong irreducible water saturation change trend and the weak irreducible water saturation change trend of the target stratum, and further can be helpful for determining the accurate water outlet result of the target stratum.
And S220, determining a strong irreducible water limit model of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameters of each core sample.
Because the pore structure parameter and the strong irreducible water saturation of each core sample are known, the method can fit the pore structure parameter and the strong irreducible water saturation of each core sample by adopting a numerical analysis method, and finally, a function which can embody the corresponding relation between the pore structure parameter and the strong irreducible water saturation of the target stratum is obtained.
In a possible embodiment, optionally, determining the strongly-bound water boundary model of the target stratum according to the strongly-bound water saturation of each core sample and the pore structure parameter of each core sample includes: and fitting the strong irreducible water saturation of each core sample and the pore structure parameters of each core sample by adopting a power function to determine the strong irreducible water limit model of the target stratum.
Illustratively, as shown in fig. 4, in a rectangular coordinate system, each coordinate point represents a strongly-tethered water saturation of a core sample corresponding to a pore structure parameter of the core sample. According to the scheme, a power function can be adopted to carry out nonlinear fitting on each coordinate point in a rectangular coordinate system, and a function which reflects the relation between the strong irreducible water saturation and the pore structure parameter of the target stratum, such as y= 26.207x -0.285, namely a strong irreducible water limit model of the target stratum is finally obtained.
And fitting the pore structure parameters of each core sample by adopting a power function to determine a strong-constraint water limit model of the target stratum. The method can provide reliable data sources for determining the strong irreducible water saturation change trend of the target stratum, and further can determine the accurate water outlet result of the target stratum.
And S230, determining the strong irreducible water saturation change trend of the target stratum according to the strong irreducible water limit model.
Illustratively, since the strongly-bound water limit model of the target stratum is known, and the pore structure parameters of the target stratum are known, the method can determine the strongly-bound water saturation change trend of the target stratum according to the strongly-bound water limit model and the pore structure parameters of the target stratum.
And S240, determining a weakly-bounded water limit model of the target stratum according to the weakly-bounded water saturation of each core sample and the pore structure parameters of each core sample.
Because the pore structure parameter and the weak irreducible water saturation of each core sample are known, the method can fit the pore structure parameter and the weak irreducible water saturation of each core sample by adopting a numerical analysis method, and finally a function which can embody the corresponding relation between the pore structure parameter and the weak irreducible water saturation of the target stratum is obtained.
In another possible embodiment, optionally, determining the weakly-bounded water boundary model of the target formation according to the weakly-bounded water saturation of each core sample and the pore structure parameter of each core sample includes: and fitting the weak irreducible water saturation of each core sample and the pore structure parameters of each core sample by adopting a power function to determine a weak irreducible water limit model of the target stratum.
Illustratively, as shown in fig. 4, in a rectangular coordinate system, each coordinate point represents weak irreducible water saturation of a core sample corresponding to a pore structure parameter of the core sample. According to the scheme, nonlinear fitting can be carried out on all coordinate points by adopting a power function in a rectangular coordinate system, and finally, a relational expression showing the relation between the weak irreducible water saturation and the pore structure parameter of the target stratum is obtained, for example, y= 34.399x -0.355, namely, a weak irreducible water boundary model of the target stratum.
And fitting the weak irreducible water saturation of each core sample and the pore structure parameters of each core sample by adopting a power function to determine a weak irreducible water limit model of the target stratum. The method can provide reliable data sources for determining the change trend of the weak irreducible water saturation of the target stratum, and further can determine the accurate water outlet result of the target stratum.
S250, determining the change trend of the weak irreducible water saturation of the target stratum according to the weak irreducible water limit model.
Illustratively, since the weakly bound water limit model of the target stratum is known, the pore structure parameter of the target stratum is known, and therefore the method can determine the change trend of the weakly bound water saturation of the target stratum according to the weakly bound water limit model and the pore structure parameter of the target stratum.
The execution sequence of step S220 and step S240 is not limited, and may be executed simultaneously or sequentially. However, step S230 must be performed after the completion of step S220, and step S250 must be performed after the completion of step S240.
And S260, determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum.
The depth range of the target stratum can be known, and the relative magnitude relation among the strong irreducible water saturation, the weak irreducible water saturation and the water saturation in the depth range of the target stratum can be determined according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum, so that the water outlet result of the target stratum can be determined.
In yet another possible embodiment, optionally, determining the water output result of the target formation according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend, and the water saturation change trend of the target formation includes: if the strong bound water saturation of the target stratum is greater than or equal to the water saturation of the target stratum, determining that the target stratum only comprises strong bound water; or if the water saturation of the target stratum is determined to be greater than the strong irreducible water saturation of the target stratum and the water saturation of the target stratum is less than or equal to the weak irreducible water saturation of the target stratum, determining that the target stratum comprises strong irreducible water and weak irreducible water; or if the water saturation of the target formation is determined to be greater than the weakly water saturation of the target formation, determining that the target formation includes strongly bound water, weakly bound water, and free water.
By way of example, the present solution may represent the strong water saturation of the target formation by Sw2, the weak water saturation of the target formation by Sw1, the water saturation of the target formation by Swe, and may perform fine evaluation of the fluid composition of the target formation and predict the water output of the target formation:
When Swe of the target stratum is less than or equal to Sw2, the hiding power of the target stratum is strong, and only the strongly bound water component exists. If the water saturation Swe is equal to the strongly-irreducible water saturation Sw2, then the target formation is indicated to be a premium reservoir. The gas reservoir has no formation water production in production and development, or only produces trace condensate water.
When Sw2 of the target stratum is less than Swe and less than or equal to Sw1, the formation power of the target stratum is slightly weaker than that of a high-quality gas reservoir, the strong irreducible water component and the weak irreducible water component exist, the saturation of the strong irreducible water is Sw2, and the saturation of the weak irreducible water is Swe-Sw2. In the production and development of the gas reservoirs, water is discharged when the flow pressure difference reaches a certain critical pressure value, and the produced water component is a weakly bound water component, wherein the critical pressure value is the reservoir forming power of the gas reservoirs. When the flow differential is greater than the reservoir power, the primary formation water in the reservoir will be produced along with the natural gas.
When the water saturation of the target stratum is less than 60 percent and Swe is more than Sw1, the low-gas saturated gas reservoir with three water components of strong bound water, weak bound water and free water is indicated that the reservoir forming power of the target stratum is weak. Wherein, the saturation of strongly-bound water is Sw2, the saturation of weakly-bound water is Sw1-Sw2, and the saturation of free water is Swe-Sw1. The target stratum is extremely easy to produce water in production and development due to insufficient hiding power, basically has no natural productivity under the conditions of low permeability and compactness, and has no development value.
Thus, by determining that only strongly-bound water is included in the target formation if the strongly-bound water saturation of the target formation is determined to be greater than or equal to the water saturation of the target formation; or if the water saturation of the target stratum is determined to be greater than the strong-constraint water saturation of the target stratum and the water saturation of the target stratum is less than or equal to the weak-constraint water saturation of the target stratum, determining that the target stratum comprises strong-constraint water and weak-constraint water; or if the water saturation of the target formation is determined to be greater than the weakly bound water saturation of the target formation, determining that the target formation includes strongly bound water, weakly bound water, and free water. The method can realize the fine evaluation of the fluid components of the gas reservoir, further perfects the water outlet mechanism of the hypotonic-compact gas reservoir, further recognizes the occurrence form of each fluid component in the hypotonic-compact gas reservoir and the contribution of each fluid component to the water outlet, and has important guiding significance for the production and development of the gas reservoir.
According to the technical scheme provided by the embodiment of the invention, the pore structure parameter, the strong irreducible water saturation and the weak irreducible water saturation of at least one core sample in a target stratum are determined; determining a strong-constraint water limit model of the target stratum according to the strong-constraint water saturation of each core sample and the pore structure parameters of each core sample; determining the strong-constraint water saturation change trend of the target stratum according to the strong-constraint water limit model; determining a weakly-bounded water limit model of the target stratum according to the weakly-bounded water saturation of each core sample and the pore structure parameters of each core sample; determining the change trend of the saturation of the weakly-bound water of the target stratum according to the weakly-bound water limit model; and determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum. By executing the scheme, the fine interpretation and evaluation of the hypotonic and compact gas reservoirs can be realized, and the method has important guiding significance for the production and development of the gas reservoirs, so that the economic benefit can be improved.
Fig. 5 is a schematic structural diagram of a logging evaluation device for a water output result of a hypotonic and tight gas reservoir according to an embodiment of the present invention, where the device may be configured in an electronic device for logging evaluation of a water output result of a hypotonic and tight gas reservoir, as shown in fig. 5, and the device includes:
a core sample information determining module 310, configured to determine pore structure parameters, strongly-tethered water saturation, and weakly-tethered water saturation of at least one core sample in a target formation; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
the irreducible water saturation change trend determining module 320 is configured to determine a strong irreducible water saturation change trend of the target formation according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determine a weak irreducible water saturation change trend of the target formation according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
A water output result determining module 330, configured to determine a water output result of the target formation according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend, and the water saturation change trend of the target formation; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
Optionally, the irreducible water saturation change trend determining module 320 includes a strong irreducible water limit model determining unit, configured to determine a strong irreducible water limit model of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample; the strong-constraint water saturation change trend determining unit is used for determining the strong-constraint water saturation change trend of the target stratum according to the strong-constraint water limit model; the weakly-bounded water limit model determining unit is used for determining a weakly-bounded water limit model of the target stratum according to the weakly-bounded water saturation of each core sample and the pore structure parameters of each core sample; and the weak irreducible water saturation change trend determining unit is used for determining the weak irreducible water saturation change trend of the target stratum according to the weak irreducible water limit model.
Optionally, the strongly-bound water limit model determining unit is specifically configured to fit the strongly-bound water saturation of each core sample and the pore structure parameter of each core sample by using a power function to determine a strongly-bound water limit model of the target stratum.
Optionally, the weakly-bounded water boundary model determining unit is specifically configured to fit the weakly-bounded water saturation of each core sample and the pore structure parameter of each core sample by using a power function to determine a weakly-bounded water boundary model of the target stratum.
Optionally, the water output result determining module 330 is specifically configured to determine that the target formation includes only strongly-bound water if it is determined that the strongly-bound water saturation of the target formation is greater than or equal to the water saturation of the target formation; or if the water saturation of the target stratum is determined to be greater than the strong irreducible water saturation of the target stratum and the water saturation of the target stratum is less than or equal to the weak irreducible water saturation of the target stratum, determining that the target stratum comprises strong irreducible water and weak irreducible water; or if the water saturation of the target formation is determined to be greater than the weakly water saturation of the target formation, determining that the target formation includes strongly bound water, weakly bound water, and free water.
Optionally, the core sample information determining module 310 includes: the capillary pressure determining unit is used for determining average strong capillary pressure and average weak capillary pressure of each core sample; and the irreducible water saturation determining unit is used for determining the strong irreducible water saturation of each core sample under the average strong capillary pressure and the weak irreducible water saturation under the average weak capillary pressure by adopting capillary pressure experiments.
Optionally, the capillary pressure determining unit comprises a capillary pressure determining subunit, and is used for determining the strong capillary pressure and the weak capillary pressure of each core sample after saturated water treatment by adopting a multistage centrifugal force nuclear magnetic experiment; the average strong capillary pressure determining subunit is used for taking the average value of the strong capillary pressures as the average strong capillary pressure of each core sample; and the average weak capillary pressure determining subunit is used for taking the average value of the weak capillary pressures as the average weak capillary pressure of each core sample.
The device provided by the embodiment can execute the logging evaluation method of the low permeability and tight gas reservoir water outlet result provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 6, where the device includes:
one or more processors 410, one processor 410 being illustrated in fig. 6;
A memory 420;
the apparatus may further include: an input device 430 and an output device 440.
The processor 410, memory 420, input means 430 and output means 440 in the apparatus may be connected by a bus or otherwise, in fig. 6 by way of example.
The memory 420 is used as a non-transitory computer readable storage medium for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to a logging evaluation method for low permeability, tight gas reservoir water production results in an embodiment of the present invention. The processor 410 executes software programs, instructions and modules stored in the memory 420 to perform various functional applications and data processing of the computer device, namely, a logging evaluation method for implementing the low permeability, tight gas reservoir water output result of the above method embodiment, namely:
Determining pore structure parameters, strongly-bound water saturation and weakly-bound water saturation of at least one core sample in a target formation; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
Determining a strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
Determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend, the weak-constraint water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
Memory 420 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the computer device, etc. In addition, memory 420 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 420 may optionally include memory located remotely from processor 410, which may be connected to the terminal device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 430 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the computer device. The output 440 may include a display device such as a display screen.
The embodiment of the invention provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, realizes the logging evaluation method of the water outlet result of the hypotonic and compact gas reservoir, namely:
Determining pore structure parameters, strongly-bound water saturation and weakly-bound water saturation of at least one core sample in a target formation; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
Determining a strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
Determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend, the weak-constraint water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A logging evaluation method for the water output result of a hypotonic or tight gas reservoir, comprising the steps of:
Determining pore structure parameters, strongly-bound water saturation and weakly-bound water saturation of at least one core sample in a target formation; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
Determining a strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining a weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
Determining the water outlet result of the target stratum according to the strong-constraint water saturation change trend, the weak-constraint water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
2. The method of claim 1, wherein determining the trend of the change in strongly-bound water saturation of the target formation based on the strongly-bound water saturation of each core sample and the pore structure parameter of each core sample, and determining the trend of the change in weakly-bound water saturation of the target formation based on the weakly-bound water saturation of each core sample and the pore structure parameter of each core sample comprises:
Determining a strong-constraint water limit model of the target stratum according to the strong-constraint water saturation of each core sample and the pore structure parameters of each core sample;
determining the strong-constraint water saturation change trend of the target stratum according to the strong-constraint water limit model;
Determining a weakly-bounded water limit model of the target stratum according to the weakly-bounded water saturation of each core sample and the pore structure parameters of each core sample;
And determining the weak irreducible water saturation change trend of the target stratum according to the weak irreducible water limit model.
3. The method of claim 2, wherein determining the strongly-tethered water-bounding model of the target formation based on the strongly-tethered water saturation of each core sample and the pore structure parameter of each core sample comprises:
And fitting the strong irreducible water saturation of each core sample and the pore structure parameters of each core sample by adopting a power function to determine the strong irreducible water limit model of the target stratum.
4. The method of claim 2, wherein determining the weakly-bounded water-model of the target formation based on the weakly-bounded water saturation of each core sample and the pore structure parameter of each core sample comprises:
And fitting the weak irreducible water saturation of each core sample and the pore structure parameters of each core sample by adopting a power function to determine a weak irreducible water limit model of the target stratum.
5. The method of claim 1, wherein determining the water out of the target formation from the strong irreducible water saturation trend, the weak irreducible water saturation trend, and the water saturation trend of the target formation comprises:
If the strong bound water saturation of the target stratum is greater than or equal to the water saturation of the target stratum, determining that the target stratum only comprises strong bound water;
Or if the water saturation of the target stratum is determined to be greater than the strong irreducible water saturation of the target stratum and the water saturation of the target stratum is less than or equal to the weak irreducible water saturation of the target stratum, determining that the target stratum comprises strong irreducible water and weak irreducible water;
or if the water saturation of the target formation is determined to be greater than the weakly water saturation of the target formation, determining that the target formation includes strongly bound water, weakly bound water, and free water.
6. The method of claim 1, wherein the determining of the strongly and weakly irreducible water saturation comprises:
determining the average strong capillary pressure and the average weak capillary pressure of each core sample;
and determining the strong irreducible water saturation of each core sample under the average strong capillary pressure and the weak irreducible water saturation under the average weak capillary pressure by adopting a capillary pressure experiment.
7. The method of claim 6, wherein determining the average strong capillary pressure and the average weak capillary pressure for each core sample comprises:
Determining the strong capillary pressure and the weak capillary pressure of each core sample after saturated water treatment by adopting a multistage centrifugal force nuclear magnetic experiment;
Taking the average value of the strong capillary pressure as the average strong capillary pressure of each core sample;
the average value of the weak capillary pressure is taken as the average weak capillary pressure of each core sample.
8. A logging evaluation device for the water output of a hypotonic or tight gas reservoir, comprising:
The rock core sample information determining module is used for determining pore structure parameters, strong irreducible water saturation and weak irreducible water saturation of at least one rock core sample in the target stratum; wherein the reservoir type of the target formation comprises at least one of a conventional reservoir, a hypotonic reservoir, and a tight reservoir;
The irreducible water saturation change trend determining module is used for determining the strong irreducible water saturation change trend of the target stratum according to the strong irreducible water saturation of each core sample and the pore structure parameter of each core sample, and determining the weak irreducible water saturation change trend of the target stratum according to the weak irreducible water saturation of each core sample and the pore structure parameter of each core sample;
The water outlet result determining module is used for determining the water outlet result of the target stratum according to the strong irreducible water saturation change trend, the weak irreducible water saturation change trend and the water saturation change trend of the target stratum; the water saturation change trend of the target stratum is determined by the closed coring saturation of each core sample.
9. An electronic device, comprising:
one or more processors;
storage means for storing one or more programs,
When executed by the one or more processors, causes the one or more processors to implement the logging evaluation method of hypotonic or tight gas reservoir drainage results of any one of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a logging evaluation method of the effluent results of a hypotonic or tight gas reservoir according to any of claims 1-7.
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| CN104564006A (en) * | 2015-02-04 | 2015-04-29 | 中国海洋石油总公司 | Hypotonic gas well fracturing water-producing capacity judgment method |
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| CN104564006A (en) * | 2015-02-04 | 2015-04-29 | 中国海洋石油总公司 | Hypotonic gas well fracturing water-producing capacity judgment method |
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