CN105842751B - Shale reservoir fracture evaluation method - Google Patents
Shale reservoir fracture evaluation method Download PDFInfo
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- CN105842751B CN105842751B CN201610152262.9A CN201610152262A CN105842751B CN 105842751 B CN105842751 B CN 105842751B CN 201610152262 A CN201610152262 A CN 201610152262A CN 105842751 B CN105842751 B CN 105842751B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses shale reservoir fracture evaluation methods, by successively carrying out coring research, well log interpretation, Geologic modeling, realize comprehensive fracture intensity analysis, and make analysis degree from the easier to the more advanced, by fine, realizing the purpose for comprehensively and accurately carrying out fracture evaluation analysis to shale reservoir roughly.
Description
Technical field
The present invention relates to geological exploration and development fields, relate in particular to shale reservoir fracture evaluation method.
Background technique
Shale oil gas is as energy extraction source newborn in recent years, from the source bed for thinking that oil gas can not be preserved in the past
The exploitation of petroleum resources is carried out, there is extensive prospect in the world.And not with the pore channel in conventional sandstone reservoir
Together, oil-gas migration is carried out using crack in rammell, crack can provide aggregation space both for shale gas, can also be shale gas
Production provides migration pathway.For mud shale as a kind of low porosity and low permeability reservoir, the production mechanism of oil gas is extremely complex, is related to adsorbing
Correlation etc. between Gas content and free Gas content, natural microcrack and pressure break attractive joint.And it is natural micro- in mud shale
Crack is divided into build joint, interlayer laminated structure of shale seam, level sliding seam, diagenesis again and shrinks microcrack and organic matter evolution abnormal pressure seam 5
Kind, complicated classification, identification feature and governing factor are different.Therefore, carrying out comprehensive assay just to it can ensure that
Bigger recovery ratio and economic benefit.However, the equal mode of shale reservoir fracture evaluation in the prior art is single, it is not comprehensive enough.
Summary of the invention
For above-mentioned deficiency in the prior art, the invention proposes shale reservoir fracture evaluation methods, realize comprehensive, quasi-
The true purpose that fracture evaluation analysis is carried out to shale reservoir.
The present invention is achieved through the following technical solutions:
Shale reservoir fracture evaluation method, this method include following technical step:
(a) in a certain oil-gas exploration and development block, according to geological conditions and goal in research demand, choosing has characterization meaning
The well of justice carries out coring operation and detecting earth stress to shale reservoir section；(b) electron-microscope scanning observation is carried out to rock core, confirmation is split
Seam development section, description and record fracture intensity and occurrence；(c) experiment of triaxial stress rock strain is carried out to rock core, obtained
Stress-strain diagram；(d) resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron survey are carried out
Well, density log, calliper log obtain the above-mentioned log of the full well section of target well, to confirm the coring Duan Qu of fracture development
Line is reference, judges more fracture development well sections in conjunction with well log interpretation；(e) to the fracture development well judged in step (d)
Duan Jinhang acoustic televiewer log (HBTV) or micro-resisitivity image (FMI or EMI)；(f) to judging in step (d)
Fracture development well section carry out VSP well logging or crosshole seismic well logging；(g) according to above-mentioned all data, individual well section model is established,
Overall merit fracture intensity.
For the single problem of shale reservoir fracture evaluation mode in the prior art, the invention proposes a kind of comprehensive pages
Rock Reservoir Fracture evaluation method, this method carry out coring first in drilling process, obtain the rock core of mud shale layer, then to rock core
Electron-microscope scanning observation is carried out to examine and record on rock core using high-definition picture caused by scanning electron microscope
The form in crack, width, length, seam face situation, corrosion and filling situation, fracture coefficient etc., thus to the shale reservoir of the well
The basic condition in middle crack has substantially and gets information about.Later, the experiment of triaxial stress rock strain is carried out to rock core, is wrapped
Stress deformation containing rock core and rupture overall process stress-strain diagram, using stress-strain diagram determine rock the stress limit,
Rupture strength, and with this study of rocks rupture before set deformation volume size, determine crack generate critical stress value, and with before
The crustal stress value of acquisition is compared, with auxiliary judgment rammell fracture intensity.Meanwhile logging operation is carried out to the well,
Well logging project includes but is not limited to resistivity, sound wave, natural potential, natural gamma, compensated neutron, density, hole diameter, obtains target
The above-mentioned log of the full well section of well, and the feature for indicating fracture development is found from above-mentioned log, such as: deep lateral resistance
The significantly greater than shallow lateral resistivity of rate, induction motor is significantly greater than lateral resistivity, gamma ray curve increases extremely, resistance
It is abnormal etc. that anomalous variation even zigzag variation, spontaneous potential curve and hole diameter occurs in rate curve.It finds out according to rock core
Observation, confirms the log of the well section of fracture development, and take this as a foundation in combination with well log interpretation, judges full well mud shale
The possible developmental state in section crack, lists all possible fracture intensities of mud shale section.Later, to sentencing in step (d)
It is disconnected go out fracture development well section successively carry out acoustic televiewer log (HBTV) or micro-resisitivity image (FMI or EMI),
VSP well logging or crosshole seismic well logging.Acoustic televiewer log and micro-resisitivity image are all in imaging logging techniques
One kind, as the most intuitive effective logging mode in identification crack, individually carrying out an imaging logging operation is necessary,
Because Image Logging Data can protrude because crack variation caused by rock acoustic impedance and resistivity variation characteristic, reduce by
Non- crack response caused by the human factors such as drilling engineering influences, to correct the error of other Conventional Logs.VSP is surveyed
Well, i.e. vertical seismic profile log equally judge that crack is sent out with crosshole seismic well logging by the reflectance signature difference of seismic wave
Educate situation.Well-shooting can be determined the journey of fracture development by the strong and weak feature of back wave on the basis of above-mentioned crack judges
Degree, auxiliary aforesaid way completion comprehensively recognize rammell crack.Finally, establishing individual well section according to above-mentioned all data
Model, overall merit fracture intensity.
Further, by step (a) ~ (g) for the N mouth well in same oil-gas exploration and development block, by N number of individual well
Section model is established as Reservoir Lithofacies threedimensional model, wherein N is the positive integer more than or equal to 2.Multiple wells in i.e. how same block
Individual well data is established using aforesaid way, and by all Data Integrations, establishes Reservoir Lithofacies threedimensional model, convenient for page in trap
Rock stratum entirety fracture intensity is grasped.
Further, in the individual well section model, conventional sandstone reservoir and shale reservoir are made into obvious differentiation, with
Convenient for the research of the development scheme to shale oil-gas reservoir, avoid confusion.
Compared with prior art, the present invention having the following advantages and benefits:
1, shale reservoir fracture evaluation method of the present invention, by successively carrying out coring research, well log interpretation, Geologic modeling,
Realize comprehensive fracture intensity analysis, and make analysis degree from the easier to the more advanced, by fine, realize roughly comprehensively, standard
True carries out fracture evaluation analysis to shale reservoir.
2, shale reservoir fracture evaluation method of the present invention only has necessary well section on the Research foundation of the next item up step
Targetedly use subsequent step, can save the cost and time, improve to the efficiency of shale reservoir fracture evaluation.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the schematic process flow diagram of a specific embodiment of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1:
Shale reservoir fracture evaluation method as shown in Figure 1, this method include following technical step :(a) in a certain oil gas
In exploration and development block, according to geological conditions and goal in research demand, choose the well with symbolical meanings, to shale reservoir section into
Row coring operation and detecting earth stress；(b) electron-microscope scanning observation is carried out to rock core, confirms fracture development section, description and record are split
Stitch developmental state and occurrence；(c) experiment of triaxial stress rock strain is carried out to rock core, obtains stress-strain diagram；(d) electricity is carried out
The well logging of resistance rate, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density log, calliper log, obtain
Sentence to the above-mentioned log of the full well section of target well using the coring section curve for confirming fracture development as reference in conjunction with well log interpretation
Disconnected more fracture development well sections out；(e) acoustic televiewer log (HBTV) is carried out to the fracture development well section judged in step (d)
Or micro-resisitivity image (FMI or EMI)；(f) VSP survey is carried out to the fracture development well section judged in step (d)
Well or crosshole seismic well logging；(g) according to above-mentioned all data, individual well section model, overall merit fracture intensity are established.It will
N number of individual well section model is established as reservoir for the N mouth well in same oil-gas exploration and development block by step (a) ~ (g)
Lithofacies threedimensional model, while conventional sandstone reservoir and shale reservoir are made into obvious differentiation.Heretofore described step successively into
Row, on the Research foundation of the next item up step, only targetedly uses subsequent step to necessary well section, can make analysis degree
From the easier to the more advanced, by roughly to fine, while save the cost and time, realize that comprehensively and accurately carrying out crack to shale reservoir comments
Valence analysis.
The upper specific embodiment has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in
Within protection scope of the present invention.
Claims (3)
1. shale reservoir fracture evaluation method, which is characterized in that this method includes following technical step:
(a) in a certain oil-gas exploration and development block, according to geological conditions and goal in research demand, choosing has symbolical meanings
Well carries out coring operation and detecting earth stress to shale reservoir section；
(b) electron-microscope scanning observation is carried out to rock core, confirms fracture development section, description and record fracture intensity and occurrence；
(c) experiment of triaxial stress rock strain is carried out to rock core, obtains stress-strain diagram；
(d) resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density survey are carried out
Well, calliper log obtain the above-mentioned log of the full well section of target well, using confirm the coring section curve of fracture development as reference,
More fracture development well sections are judged in conjunction with well log interpretation；
(e) acoustic televiewer log (HBTV) is carried out to the fracture development well section judged in step (d) or microresistivity is scanned into
As well logging；
(f) VSP well logging is carried out to the fracture development well section judged in step (d) or crosshole seismic is logged well；
(g) according to above-mentioned all data, individual well section model, overall merit fracture intensity are established.
2. shale reservoir fracture evaluation method according to claim 1, it is characterised in that: use step (a)~(g)
In the N mouth well in same oil-gas exploration and development block, N number of individual well section model is established as Reservoir Lithofacies threedimensional model；Wherein,
N is the positive integer more than or equal to 2.
3. shale reservoir fracture evaluation method according to claim 1, it is characterised in that: in the individual well section model
In, conventional sandstone reservoir and shale reservoir are made into obvious differentiation.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425912A (en) * | 2017-09-05 | 2019-03-05 | 中国石油化工股份有限公司 | A kind of recognition methods of Carbonate Reservoir reservoir effective fracture |
| CN109870743B (en) * | 2019-03-05 | 2021-04-06 | 中国石油大学(北京) | Page-based seam space spread prediction method and device |
| CN111239849A (en) * | 2020-02-10 | 2020-06-05 | 东北石油大学 | Reservoir fracture prediction method and prediction system based on stress release |
| CN113495304B (en) * | 2020-04-01 | 2024-06-25 | 中国石油天然气集团有限公司 | Three-dimensional modeling method for reservoir microcracks |
| CN114135264B (en) * | 2020-08-14 | 2024-04-02 | 中国石油化工股份有限公司 | Method, device and storage medium for determining development degree of microcracks of tight sandstone |
| CN113552638A (en) * | 2021-09-18 | 2021-10-26 | 数皮科技(湖北)有限公司 | Millimeter-level bedding joint method for identifying shale reservoir in-situ state |
| CN114325854A (en) * | 2022-03-04 | 2022-04-12 | 中海油研究总院有限责任公司 | Method for judging development degree of different-grade cracks of rock core |
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| CN103376469A (en) * | 2012-04-26 | 2013-10-30 | 中国石油集团长城钻探工程有限公司 | Fissure quantitative evaluation method based on ultrasonic imaging logging |
| CN103792581A (en) * | 2013-12-31 | 2014-05-14 | 刘致水 | Shale gas reservoir crustal stress logging prediction method based on rock physics model |
| CN104977618A (en) * | 2014-04-09 | 2015-10-14 | 中国石油集团东方地球物理勘探有限责任公司 | Method for evaluating shale gas reservoir and finding dessert area |
| CN105182423A (en) * | 2015-10-22 | 2015-12-23 | 中国石油大学(华东) | Integrated recognition method for overpressured crack |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103376469A (en) * | 2012-04-26 | 2013-10-30 | 中国石油集团长城钻探工程有限公司 | Fissure quantitative evaluation method based on ultrasonic imaging logging |
| CN103792581A (en) * | 2013-12-31 | 2014-05-14 | 刘致水 | Shale gas reservoir crustal stress logging prediction method based on rock physics model |
| CN104977618A (en) * | 2014-04-09 | 2015-10-14 | 中国石油集团东方地球物理勘探有限责任公司 | Method for evaluating shale gas reservoir and finding dessert area |
| CN105182423A (en) * | 2015-10-22 | 2015-12-23 | 中国石油大学(华东) | Integrated recognition method for overpressured crack |
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