CN105607129A - Seismic identification method for complex fault block unconformity surfaces - Google Patents
Seismic identification method for complex fault block unconformity surfaces Download PDFInfo
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- CN105607129A CN105607129A CN201410645304.3A CN201410645304A CN105607129A CN 105607129 A CN105607129 A CN 105607129A CN 201410645304 A CN201410645304 A CN 201410645304A CN 105607129 A CN105607129 A CN 105607129A
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Abstract
The invention provides a seismic identification method for complex fault block unconformity surfaces, comprising the following steps: S1, acquiring the initial time depth and structure features of a simple area, and grasping the structure initial form and features of the whole research area by constructing the structure features of the simple area; S2, for construction of a complex area, performing complex area fine synthetic seismogram calibration, and determining the time depth relationship and seismic reflection features of an unconformity surface; and S3, extrapolating a well-free area through connected well profile interpretation, and performing tracking interpretation of the unconformity surface of the complex area. The seismic identification method for complex fault block unconformity surfaces provides a foundation reference for residual oil distribution rule research and reserve calculation of the oil reservoirs in complex fault blocks, plays a guidance role in later development of oil reservoirs of the kind, has a broad popularization and application prospect and can bring remarkable economic and social benefits.
Description
Technical field
The present invention relates to Complex Fault Block Oil Reservoir meticulous pool description field, particularly relate to a kind of complex fault block plane of unconformitySeismic identification.
Background technology
Plane of unconformity is the sedimentary break that earth's crust elevating movement causes, it and oil-gas accumulation have close relationship, can be for divingType is degraded on mountain type, stratum, overlap of beds type oil reservoir provides effective oil-gas accumulation place, isolated island, the orphan of Shengli Oil FieldThe buried hill draping structure accumulation zones such as east-stake west, Cheng Dong, Cheng Dao, square king have up and down grows dissimilar oil-gas reservoir.Therefore, describe the structural feature of plane of unconformity and portray its breaking morphology and calculate and oil reservoir development for the reserves of this type of oil reservoirMost important. Due to going deep into of exploration and development, the simple unconformity pool recovery percent of some structural configurations is higher, not wholeThe identification of closing face is also fairly simple, and understanding is also very meticulous with description, but the unconformity reservoir of complex region is because it is constructedThe complexity of form, has restricted its understanding and oil and gas development to oil reservoir. The existing seismic description master for plane of unconformityIf reflecting up and down the ripple stack features of axle in the same way by plane of unconformity on the basis of sound wave composite traces horizon calibration carries out, complex fault block is because plane of unconformity vertical and horizontal overlying strata velocity variations is larger, mature fault, and seismic resolution hasLimit, seismic profile can not effectively react the form of plane of unconformity, because existing, plane of unconformity degrades or the situation such as onlap,Upper and lower complex lithology, conventional composite traces and seismic trace near well matching effect are poor, near horizon calibration difficulty plane of unconformity,The seismic description difficulty of plane of unconformity, we have invented a kind of seismic recognition side for Complex Fault Block Oil Reservoir plane of unconformity for this reasonMethod, has solved above problem.
Summary of the invention
The object of this invention is to provide a kind of seismic identification of complex fault block plane of unconformity, first it implement simple zonesDark and structural feature when preliminary, adopts lithology and well log analysis in conjunction with composite traces for the geological condition of complex regionDemarcate, accurately implement complex area time dark and plane of unconformity Seismic reflection character, thereby reach, to identify complex region not wholeClose the object of face.
Object of the present invention can be achieved by the following technical measures: the seismic identification of complex fault block plane of unconformity, and shouldThe seismic identification of complex fault block plane of unconformity comprises: step 1, while implementing simple zones preliminary, dark and structural feature, logicalCross simple structure district structural feature and hold the preliminary form of structure and the feature of whole study area; Step 2, for structural complexTerritory, carries out the meticulous composite traces in complex area and demarcates, and determines time dark relation and the Seismic reflection character of plane of unconformity; And stepRapid 3, explain by connecting well profile, then extrapolate without wellblock, complex region plane of unconformity is followed the trail of to explanation.
Object of the present invention also can be achieved by the following technical measures:
In step 1, under geological layer guidance, the well in simple structure district is carried out to composite traces demarcation, determine preliminaryTime dark relation, the plane of unconformity in Bing Duigai district and near index bed thereof are followed the trail of explanation, implement the structure shape of simple zonesState and fracture characteristic, for instructing the understanding to structural complex domain construction and fracture characteristic.
In step 2, for complex area in constitution, from individual well, first log is carried out to pretreatment, remove strangeDifferent value is also carried out environmental correction; Then aboveground lithology is analyzed, determined the upper and lower lithology of plane of unconformity, and in conjunction with surveyingWell curve, analyzes the relation between the upper and lower log of plane of unconformity and lithology, utilizes this to the upper and lower lithology of plane of unconformityReflect that responsive log and sound wave curve adopt the method for statistical regression to reconstitute plan sound wave curve; Finally utilize thisReconstruct curve carries out meticulous composite traces demarcation to complex region well, determines time dark relation and the earthquake of plane of unconformity on individual wellReflectance signature, for instruct complex region plane of unconformity earthquake follow the trail of explain.
In step 2, complex area in constitution comprises fault development, overlap of beds or degrades region.
In step 3, on the basis of demarcating at reconstruct sound wave composite traces, from individual well, explain by crossing well main profile,Then cross well interconnection and explain, secondly extrapolation seismic trace near well, finally by connecting arbitrarily, well line is explained and inspection plane of unconformityStructure interpretation.
The seismic identification of the complex fault block plane of unconformity in the present invention, it is implementing the structural feature in simple structure regionBasis on, for the geologic feature of the plane of unconformity of complex area in constitution, from lithologic analysis, utilize lithology sensitivityCurve and acoustic logging are jointly made composite traces and are demarcated, and accurately implement the time dark and seismic reflection of plane of unconformityFeature, thus plane of unconformity is described. This recognition methods solved conventional sound wave composite traces mate with seismic trace near well poor,Near complex region plane of unconformity, horizon calibration is difficult and inaccurate, and seismic profile is followed the trail of the problem of plane of unconformity difficulty, passes through the partyMethod can improve from the ability of denudation plane, overlap of beds face and the tomography of seismic profile identification plane of unconformity, for complex fault block notIntegrate oil reservoir meticulous pool description foundation is provided, the identification of the method plane of unconformity is more accurate, and simple and practical. This skillArt invention be Complex Fault Block Oil Reservoir Study on residual oil distribution, reserves calculate that basic reference is provided, to this type of oil reservoirLater development has directive function, and its popularizing application prospect is wide, remarkable economic and social benefits.
Brief description of the drawings
Fig. 1 is the flow chart of a specific embodiment of the seismic identification of complex fault block plane of unconformity of the present invention;
Fig. 2 is original sound wave, natural potential and reconstruct sound wave curve comparison diagram;
Fig. 3 is the original sound wave composite traces of GD62-6 well calibration maps;
Fig. 4 is GD62-6 well reconstruct sound wave composite traces calibration maps;
Fig. 5 is plane of unconformity structural map in example.
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.
As shown in Figure 1, Fig. 1 is the concrete implementing procedure figure of the seismic identification of complex fault block plane of unconformity.
Step 101, under geological layer guidance, carries out composite traces demarcation to the well in simple structure district, determines preliminaryTime dark relation, the plane of unconformity in Bing Duigai district and near index bed thereof are followed the trail of explanation, implement the structural configuration of simple zonesAnd fracture characteristic, for instructing the understanding to structural complex domain construction and fracture characteristic, step enters 102.
Step 102, complex area in constitution (fault development, overlap of beds or degrade), from individual well, first to well loggingCurve carries out pretreatment, removes singular value and carries out environmental correction; Then aboveground lithology is analyzed, determined not wholeThe upper and lower lithology of the face that closes, and in conjunction with log, analyze the relation between the upper and lower log of plane of unconformity and lithology, utilizeThis upper and lower lithology of plane of unconformity is reflected to responsive log and sound wave curve adopt the method for statistical regression to reconstitute planSound wave curve, finally utilizes this reconstruct curve to carry out meticulous composite traces demarcation to complex region well, determines on individual well notTime dark relation and the Seismic reflection character of integration face, explain step for instructing the earthquake of plane of unconformity of complex region to follow the trail ofSuddenly enter 103.
Step 103, on the basis of demarcating, from individual well, explains by crossing well main profile at reconstruct sound wave composite traces,Then cross well interconnection and explain, secondly extrapolation seismic trace near well, finally by connecting arbitrarily, well line is explained and inspection plane of unconformityStructure interpretation. Flow process finishes.
This technological invention is implementing on the basis of simple structure district structural feature, not whole for complex fault block unconformity poolClose the geologic feature of face, in view of not whole on seismic profile irregularities reflection and acoustic logging can not identify notWhole, in the process of composite traces, consider variation of lithological, adopt log and sound wave to variation of lithological sensitivityCurve Reconstruction is carried out composite traces demarcation again, and the present invention is mapped to seismic profile the variation of lithology, has reflected more accuratelyPlane of unconformity, and simple and practical.
Applying a specific embodiment of the present invention is a Complex Fault Block Oil Reservoir, oil bearing bed onlap, be coated in Gu Dong buried hill itUpper, oil reservoir is mainly subject to faults control, and block oil area 4.4 sq-kms report 6,930,000 tons of oils in place, after double calculation3,330,000 tons of reserves, verify oil domain and do not mate with current structure, and this region fault block, disconnected nose, micro-structure grow,Implement degree low.
(1), the well of choosing simple structure district carries out composite traces demarcation, dark while determining Liao Gai district preliminary, and by markDetermine selection standard layer position, Dui Gai district plane of unconformity and index bed are followed the trail of explanation, tentatively implement this district structural configuration andFracture characteristic.
(2), tentatively implementing on the structural configuration in simple structure district and the basis of fault conditions, to structural complexPlane of unconformity carry out structure research. Structural complex is due to its special geology characteristic: overlap of beds on buried hill,Buried hill end face exist degrade, strata pinching and mature fault, acoustic logging becomes for the lithology of this complex regionChange insensitive (Fig. 2), seismic profile is for the reflectance signature complexity of not whole. Pass through the ground to this piece for these situationsMatter, well logging, drilling data are comprehensively analyzed, and find that spontaneous potential curve is for the upper and lower variation of lithological sensitivity of plane of unconformity(Fig. 2), therefore select natural potential and sound wave curve to utilize the method for statistical regression that the curve Reconstruction of target interval is become to intendSound wave curve, the lithology reaction responsive (Fig. 2) that reconstruct curve is upper and lower to plane of unconformity. The sound wave curve system of recycling reconstructDemarcate as composite traces, compared with demarcating (Fig. 3) with original sound wave composite traces, reconstruct Curves compilation record (figure4) highlighted the Seismic reflection character of plane of unconformity, better with seismic trace near well matching effect after demarcating, thus determineThe position of complex region plane of unconformity on seismic profile and its corresponding Seismic reflection character.
(3), on the basis of complex region reconstruct sound wave composite traces demarcation, for Seismic reflection character and the layer of individual wellPosition is demarcated, and first passed through well main profile and explain, then other surveys line of extrapolating follows the trail of explanation, then close from interconnectionClose explanation, implement structural configuration and the mature fault situation (Fig. 5) of the plane of unconformity of complex area in constitution.
Demarcate by reconstruct sound wave composite traces, accurately locate stratum and surpass, shell the position of well on section, near having instructedStratum is super, the tracking of the plane of unconformity of stripping region section is explained, accurate description the plane of unconformity form of complex area in constitution(Fig. 5), by contrasting with well, on structural map, the plane of unconformity degree of depth and aboveground geology depth of seam division maximum differ 5 meters,Provide basic data accurately for next step oil in place calculates, had directive function for later development.
Claims (5)
1. the seismic identification of complex fault block plane of unconformity, is characterized in that, the seismic identification of this complex fault block plane of unconformity comprises:
Step 1, while implementing simple zones preliminary, dark and structural feature, holds the preliminary form of structure and the feature of whole study area by simple structure district structural feature;
Step 2, for complex area in constitution, carries out the meticulous composite traces in complex area and demarcates, and determines time dark relation and the Seismic reflection character of plane of unconformity; And
Step 3, explains by connecting well profile, then extrapolates without wellblock, and complex region plane of unconformity is followed the trail of to explanation.
2. the seismic identification of complex fault block plane of unconformity according to claim 1, it is characterized in that, in step 1, under geological layer guidance, the well in simple structure district is carried out to composite traces demarcation, determine preliminary time dark relation, the plane of unconformity in Bing Duigai district and near index bed thereof are followed the trail of explanation, implement structural configuration and the fracture characteristic of simple zones, for instructing the understanding to structural complex domain construction and fracture characteristic.
3. the seismic identification of complex fault block plane of unconformity according to claim 1, is characterized in that, in step 2, for complex area in constitution, from individual well, first log is carried out to pretreatment, removes singular value and carries out environmental correction; Then aboveground lithology is analyzed, determine the upper and lower lithology of plane of unconformity, and in conjunction with log, analyze the relation between the upper and lower log of plane of unconformity and lithology, utilize and this upper and lower lithology of plane of unconformity is reflected to responsive log and the method for sound wave curve employing statistical regression reconstitute plan sound wave curve; Finally utilize this reconstruct curve to carry out meticulous composite traces demarcation to complex region well, determine time dark relation and the Seismic reflection character of plane of unconformity on individual well, explain for instructing the earthquake of plane of unconformity of complex region to follow the trail of.
4. the seismic identification of complex fault block plane of unconformity according to claim 1, is characterized in that, in step 2, complex area in constitution comprises fault development, overlap of beds or degrades region.
5. the seismic identification of complex fault block plane of unconformity according to claim 1, it is characterized in that, in step 3, on the basis of demarcating at reconstruct sound wave composite traces, from individual well, explain by crossing well main profile, then cross well interconnection and explain, secondly extrapolation seismic trace near well, finally by connecting arbitrarily, well line is explained and the structure interpretation of inspection plane of unconformity.
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Cited By (6)
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| CN106405653A (en) * | 2016-10-13 | 2017-02-15 | 中国石油化工股份有限公司 | Unconformity stratum denudation amount recovery method |
| CN109557580A (en) * | 2017-09-27 | 2019-04-02 | 中国石油化工股份有限公司 | A kind of seismic interpretation method of tomography |
| CN110196450A (en) * | 2019-05-06 | 2019-09-03 | 中国石油化工股份有限公司 | Remove the plane of unconformity recognition methods that particular lithologic and fluid properties influence |
| CN110320558A (en) * | 2019-06-21 | 2019-10-11 | 中国石油大学(华东) | It is a kind of based on rock-change-electricity-shake clastic rock unconformity structure body recognition methods |
| CN113049467A (en) * | 2021-03-12 | 2021-06-29 | 东北石油大学 | Device and method for simulating unconformity convergence ridge reservoir control mechanism |
| CN116047598A (en) * | 2022-11-07 | 2023-05-02 | 北京派特杰奥科技有限公司 | Oil exploration method and system based on artificial intelligence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106405653A (en) * | 2016-10-13 | 2017-02-15 | 中国石油化工股份有限公司 | Unconformity stratum denudation amount recovery method |
| CN109557580A (en) * | 2017-09-27 | 2019-04-02 | 中国石油化工股份有限公司 | A kind of seismic interpretation method of tomography |
| CN110196450A (en) * | 2019-05-06 | 2019-09-03 | 中国石油化工股份有限公司 | Remove the plane of unconformity recognition methods that particular lithologic and fluid properties influence |
| CN110320558A (en) * | 2019-06-21 | 2019-10-11 | 中国石油大学(华东) | It is a kind of based on rock-change-electricity-shake clastic rock unconformity structure body recognition methods |
| CN113049467A (en) * | 2021-03-12 | 2021-06-29 | 东北石油大学 | Device and method for simulating unconformity convergence ridge reservoir control mechanism |
| CN113049467B (en) * | 2021-03-12 | 2021-10-22 | 东北石油大学 | Device and method for simulating unconformity convergence ridge reservoir control mechanism |
| CN116047598A (en) * | 2022-11-07 | 2023-05-02 | 北京派特杰奥科技有限公司 | Oil exploration method and system based on artificial intelligence |
| CN116047598B (en) * | 2022-11-07 | 2023-09-19 | 北京派特杰奥科技有限公司 | Oil exploration method and system based on artificial intelligence |
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