CN104047596A - Detailed correlation medium and small breakpoint identification method for delta front deposit - Google Patents
Detailed correlation medium and small breakpoint identification method for delta front deposit Download PDFInfo
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Abstract
The invention provides a detailed correlation medium and small breakpoint identification method for delta front deposit. The detailed correlation medium and small breakpoint identification method for delta front deposit comprises the following steps: determining a source direction serving as a comparison direction, and comparing each well in sequence according to the comparison direction; selecting a well which is relatively closer to a source as a standard well, and judging whether a research well has stratum loss or not by comprehensively utilizing multiple logging curves; when the research well has stratum loss according to judgment, judging whether the stratum loss part of the research well and a corresponding part of the standard well belong to the same element or not; when the stratum loss part and the corresponding part belong to the same element according to judgment, determining that tiny geological information about the loss of the research well is breakage caused by a geological fault. According to the detailed correlation medium and small breakpoint identification method for delta front deposit, small breakpoints of which the breakage thicknesses are 2-5 meters are identified effectively during detailed correlation, a deposit rule is combined closely, the objectivity is emphasized, the subjectivity is overcome, the scientificity is improved remarkably, and the operation steps are clear and reasonable.
Description
Technical field
The present invention relates to detail correlation of reservoir bed research field, particularly relate to the medium and small breakpoint of a kind of the front-delta deposition detail correlation of reservoir bed and know method for distinguishing.
Background technology
The front-delta deposition is the important reservoir sedimentation type of China's continental oil fields, and therefore, the detail correlation of reservoir bed research of the type reservoir is the important element task of oil field development geology always.Research is in the past the control methods that adopts " cycle contrast, grading control, isopic zone is not treated with a certain discrimination ", and when the method can realize waiting of substratum preferably, contrast is divided, and is the important Strata Comparison method of China's continental oil fields always.But because a lot of oil fields belong to more typical Complicated Fault Block Oilfield, tomography is many, fault block is little, low order level tomography generally distributes, therefore a bite well often bores and meets multiple tomographies, i.e. " breakpoint " on drill column, and the contrast identification of breakpoint is the important work of exploitation geology.In the time that breakthrough thickness is larger, can identify relatively easily breakpoint by contrast, but less for breakthrough thickness, particularly arrived 5m when following, such " little breakpoint " identification is just more difficult.Its reason be mainly because Continental Facies Stratigraphy deposition this just change comparatively fast, the disappearance of small geological information is that little breakpoint causes or deposits to change and causes, and is often difficult for judgement.Method is in the past exactly mainly empirical method, and subjectivity is strong, lack operating procedure clear and definite, reliable, science.We have invented the medium and small breakpoint knowledge of a kind of new the front-delta deposition detail correlation of reservoir bed method for distinguishing for this reason, have solved above technical problem.
Summary of the invention
The object of this invention is to provide one in the time of the front-delta deposition detail correlation of reservoir bed, effectively identify breakthrough thickness and know method for distinguishing at the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed of the little breakpoint of 2-5m.
Object of the present invention can be achieved by the following technical measures: the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed is known method for distinguishing, the medium and small breakpoint of this front-delta deposition detail correlation of reservoir bed is known method for distinguishing and is comprised: step 1, determine thing source side to, and selected this along thing source side to for contrast direction, carry out successively the contrast of each well according to this contrast direction; Step 2, taking the well in relatively near thing source as key hole, comprehensive utilization well logs, judges by contrast whether study well has lacuna; Step 3, in the time judging that this research well has lacuna, judges whether the part part corresponding with this key hole of this this lacuna of research well belongs to the same monobasic of sand-ash-mud tertiary mode; And step 4, in the time being judged as same monobasic, determine that the small geological information of this research well disappearance is the breakthrough that tomography causes.
Object of the present invention also can be achieved by the following technical measures:
This well logs comprises natural potential and induction curve, is aided with natural gamma, interval transit time, resistivity curve.
In step 2, the form contrast by this well logs, when this research well when a certain section of curve disappearance, judges that this research well has lacuna compared with this key hole.
This sand-ash-mud tertiary mode refer to a substratum or single sand body along this thing source side to there is successively sandstone, calcareous sand stone, be evolved into gradually grey matter mud stone until for pure shale.
In step 3, carry out sedimentation analysis according to this sand-ash-mud tertiary mode, whether there is identical lithologic character according to the residing lithology environment of the part of this this lacuna of research well with this part of this key hole, determine whether same monobasic.
In step 4, in the time being judged as different unit, the small geological information of determining this research well disappearance is that deposition changes the lacuna causing.
It is a kind of method for developing geological research fine correlation of horizons that the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed in the present invention is known method for distinguishing, the method is in traditional " cycle contrast, grading control " on method basis, by creating new depositional model, " tertiary mode " Depositional Record Constraints condition of body lithology Evolution while describing delta front etc., and during this model application is studied to the detail correlation of reservoir bed of oil field development geology, the constraints of contrast is increased, thereby set up the new method of little breakpoint contrast identification, compared with empirical method in the past, overcome conventional method and cannot determine that 5m following " lacuna " is the deficiency that little breakpoint or deposition change, in the time of the front-delta deposition detail correlation of reservoir bed, effectively identification breakthrough thickness is at the little breakpoint of 2-5m, can be closely in conjunction with deposition rule, emphasize objectivity, customer service the subjectivity in traditional contrast, scientific obviously enhancing, and operating procedure clear and rational.The method is that solid geological foundation has been established in remaining oil distribution research, for exploitation geological research provides new foundation, is conducive to the tap the latent power identification of stage fine geology research small faults of old filed and describes.
Brief description of the drawings
Fig. 1 is the flow chart that the medium and small breakpoint knowledge of the front-delta deposition detail correlation of reservoir bed of the present invention method for distinguishing is applied to specific embodiment;
Fig. 2 is the mining site example key diagram of " sand-ash-mud tertiary mode " in specific embodiment of the present invention;
Fig. 3 is the theoretical schematic diagram of " sand-ash-mud tertiary mode " in specific embodiment of the present invention;
Fig. 4 is the little breakpoint contrast of 2m identification figure in specific embodiment of the present invention;
Fig. 5 is the well location deployment diagram in specific embodiment of the present invention;
Fig. 6 is the stepout well log in specific embodiment of the present invention;
Fig. 7 is that the stepout well day degree in specific embodiment of the present invention is produced curve map.
Detailed description of the invention
For above and other object of the present invention, feature and advantage can be become apparent, cited below particularly go out preferred embodiment, and coordinate appended graphicly, be described in detail below.
The medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed in the present invention is known method for distinguishing, by the theory analysis of delta front outcrop observation description, oil field mining site real data statistics and sedimentary differentiation principle, body while having set up delta front etc. (substratum or single sand body) along thing source side to lithology evolutionary pattern: " sand-ash-mud tertiary mode ", substratum or single sand body, along thing source side to there is successively sandstone, calcareous sand stone, are evolved into grey matter mud stone gradually until be pure shale.As depositing every interlayer, its variation of lithological and reservoir are similar, have the rule (Fig. 2, Fig. 3) being developed to muddy intercalation (mud) again to grey matter interlayer (ash) by physical property interlayer (sand).This model application is in the detail correlation of reservoir bed, contrast is operated on the original base such as reference lamina, Cyclic Analysis, increase " body variation of lithological clue while grade " this constraints, the increase of this constraints makes little breakpoint ground control methods that innovative variation occur---being the little breakpoint contrast new method that we invent---" changing first deposition with unit's sudden change breaking point, different unit ", can accomplish accurately to identify the little breakpoint (Fig. 4) of 2-5m.
As shown in Figure 1, Fig. 1 is the flow chart that the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed of the present invention is known specific embodiment of method for distinguishing.
In step 101, first determine thing source side to, and selected along thing source side to for contrast direction, carry out successively the contrast (Fig. 2) of each well according to this direction.Described selected suitable thing source side is to being contrast direction, and carry out successively the contrast of each well according to this direction, be the basis of this method, with traditional foundation " contrast skeleton ", the mode that first " key well " on " skeleton " is completed to contrast has had larger variation.Flow process enters into step 102.
In step 102, for " key hole " (because the well stratum in nearly thing source is grown more complete), fully utilize all kinds of logs taking the well in relatively near thing source, judge by contrast whether study well has lacuna.The well stratum in nearly thing source is more complete, can be as the standard of contrast, progressively away from thing source, contrast each well.Due log mainly comprises natural potential and induction curve, is aided with natural gamma, interval transit time, resistivity curve.By the form contrast of log, if find research well a certain section of curve disappearance compared with key hole, be decided to be lacuna (Fig. 4).In the time that well has lacuna, flow process enters into step 103.As without lacuna, the research flow process of this research well finishes (, both without tomography, also change without deposition, belong to the well that deposition is stable, can be used as the key hole of next step contrast), starts to carry out the analysis of lower a bite well.
In step 103, whether the part part (they are same time quantums) corresponding with key hole of analysis and research well disappearance belongs to same " unit " of " sand-ash-mud tertiary mode ", be all sand " unit ", ash " unit " or mud " unit ", still different " unit ".Carry out sedimentation analysis according to " sand-ash-mud tertiary mode " set up, whether the residing lithology environment of research disappearance part and this part of key hole while waiting (they be deposit) have identical lithologic character.In the time being same " unit ", flow process enters into step 104; In the time being different " unit ", flow process enters into step 105.
In step 104, be with " unit ", the part part corresponding with key hole of namely studying well disappearance has identical lithology, refers to deposit relatively stable with " unit ", the small geological information of disappearance can be confirmed to be the breakthrough that tomography causes, and can identify the craven fault below drop 5m.This was (Fig. 4) that can not confirm before this method invention.
In step 105, be different " unit ", be generally that deposition changes the lacuna causing.
Fig. 2 is the mining site example key diagram of " sand-ash-mud tertiary mode " in specific embodiment of the present invention, can find out in the drawings, and mining site real data shows: along thing source side to, substratum, all show as the lithology evolution Feature of " sand-ash-mud " every interlayer.
Fig. 3 is the theoretical schematic diagram of " sand-ash-mud tertiary mode ", on the basis of Fig. 2 research, then observes and the theory analysis of sedimentary differentiation principle is further verified this rule by outcrop, and abstract this rule, system are become to figure.
Fig. 4 is the little breakpoint contrast of 2m identification figure in specific embodiment of the present invention, in the drawings, " tertiary mode " is applied in the detail correlation of reservoir bed, invent the little breakpoint contrast new method of " changing first deposition with unit's sudden change breaking point, different unit ", effectively having identified the little breakpoint of 2m, is the breakpoint of the drop minimum of current identification.
Fig. 5 is all dynamic authentication figure of the little breakpoint of 2m of identification to Fig. 7, according to the little breakpoint of 2m of geology identification, seismic interpretation new craven fault, study remaining oil enriched area, the effect dispose, the new well of finishing drilling being obtained, proves the accuracy of this little breakpoint, the importance of identifying so little breakpoint and advance of the present invention.
Claims (6)
1. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed is known method for distinguishing, it is characterized in that, the medium and small breakpoint of this front-delta deposition detail correlation of reservoir bed is known method for distinguishing and comprised:
Step 1, determine thing source side to, and selected this along thing source side to for contrast direction, carry out successively the contrast of each well according to this contrast direction;
Step 2, taking the well in relatively near thing source as key hole, comprehensive utilization well logs, judges by contrast whether study well has lacuna;
Step 3, in the time judging that this research well has lacuna, judges whether the part part corresponding with this key hole of this this lacuna of research well belongs to the same monobasic of sand-ash-mud tertiary mode; And
Step 4, in the time being judged as same monobasic, determines that the small geological information of this research well disappearance is the breakthrough that tomography causes.
2. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed according to claim 1 is known method for distinguishing, it is characterized in that, this well logs comprises natural potential and induction curve, is aided with natural gamma, interval transit time, resistivity curve.
3. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed according to claim 1 is known method for distinguishing, it is characterized in that, in step 2, by the form contrast of this well logs, when this research well when a certain section of curve disappearance, judges that this research well has lacuna compared with this key hole.
4. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed according to claim 1 is known method for distinguishing, it is characterized in that, this sand-ash-mud tertiary mode refer to a substratum or single sand body along this thing source side to there is successively sandstone, calcareous sand stone, be evolved into gradually grey matter mud stone until for pure shale.
5. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed according to claim 1 is known method for distinguishing, it is characterized in that, in step 3, carry out sedimentation analysis according to this sand-ash-mud tertiary mode, whether there is identical lithologic character according to the residing lithology environment of the part of this this lacuna of research well with this part of this key hole, determine whether same monobasic.
6. the medium and small breakpoint of the front-delta deposition detail correlation of reservoir bed according to claim 1 is known method for distinguishing, it is characterized in that, in step 4, in the time being judged as different unit, the small geological information of determining this research well disappearance is that deposition changes the lacuna causing.
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| CN105569649A (en) * | 2014-11-07 | 2016-05-11 | 中国石油化工股份有限公司 | Method for identifying inside structure type of subsurface fault fracture zone |
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| CN107091084A (en) * | 2017-04-28 | 2017-08-25 | 中国石油集团川庆钻探工程有限公司 | Method for extracting reservoir physical property parameters of shale gas horizontal well by establishing virtual data well |
| CN108374657A (en) * | 2018-02-02 | 2018-08-07 | 东北石油大学 | Well breakpoint automatic identifying method |
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| CN108374657B (en) * | 2018-02-02 | 2021-10-19 | 东北石油大学 | Automatic well breakpoint identification method |
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Application publication date: 20140917 |