CN107765330A - Shale reservoir fracture evaluation method - Google Patents
Shale reservoir fracture evaluation method Download PDFInfo
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- CN107765330A CN107765330A CN201610673382.3A CN201610673382A CN107765330A CN 107765330 A CN107765330 A CN 107765330A CN 201610673382 A CN201610673382 A CN 201610673382A CN 107765330 A CN107765330 A CN 107765330A
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- well
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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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- General Life Sciences & Earth Sciences (AREA)
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- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses shale reservoir fracture evaluation method, by carrying out core research, well log interpretation, Geologic modeling successively, realize comprehensive fracture intensity analysis, and making analysis degree, realization comprehensively and accurately carries out the purpose of fracture evaluation analysis to shale reservoir from the easier to the more advanced, by rough to finely.
Description
Technical field
The present invention relates to geological exploration and development field, relates in particular to shale reservoir fracture evaluation method.
Background technology
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, in the world with extensive prospect.And with the pore channel in conventional sandstone reservoir not
Together, oil-gas migration being carried out using crack in rammell, crack can both provide for shale gas assembles space, or shale gas
Production provides migration pathway.For mud shale as a kind of low porosity and low permeability reservoir, the production mechanism of its oil gas is extremely complex, is related to absorption
Correlation between Gas content and free Gas content, natural microcrack and pressure break attractive joint etc..It is and natural micro- in mud shale
Crack is divided into build joint, interlayer laminated structure of shale seam, aspect sliding seam, diagenesis and shrinks microcrack and organic matter evolution abnormal pressure seam 5 again
Kind, its complicated classification, identification feature and governing factor are different.Therefore, comprehensive assay is carried out to it just to can ensure that
Bigger recovery ratio and economic benefit.However, the equal mode of shale reservoir fracture evaluation of the prior art is single, it is not comprehensive enough.
The content of the invention
For above-mentioned deficiency of the prior art, the present invention proposes shale reservoir fracture evaluation method, realizes comprehensive, accurate
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, choose with symbolical meaningses
Well, coring operation and detecting earth stress are carried out to shale reservoir section；（b）Electron-microscope scanning observation is carried out to rock core, confirms crack hair
Educate section, description and record fracture intensity and occurrence；（c）Triaxial stress rock strain experiment is carried out to rock core, obtains stress
Strain curve；（d）Carry out resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, close
Degree well logging, calliper log, obtain the above-mentioned log of the full well section of target well, to confirm section curve of coring of fracture development as ginseng
According to judging more fracture development well sections with reference to well log interpretation；（e）To step（d）In the fracture development well section judged carry out
Acoustic televiewer log（HBTV）Or micro-resisitivity image（FMI or EMI）；（f）To step（d）In the crack judged
Develop well section and carry out VSP well loggings or crosshole seismic well logging；（g）According to above-mentioned all data, individual well section model is established, synthesis is commented
Valency fracture intensity.
For the problem of shale reservoir fracture evaluation mode is single in the prior art, the present invention proposes a kind of comprehensive page
Rock Reservoir Fracture evaluation method, this method are cored in drilling process first, obtain the rock core of mud shale layer, then to rock core
Electron-microscope scanning observation is carried out, using high-definition picture caused by SEM, examines and records on rock core
The form in crack, width, length, seam face situation, corrosion and filling situation, fracture coefficient etc., so as to the shale reservoir to the well
The basic condition in middle crack has substantially and got information about.Afterwards, triaxial stress rock strain experiment is carried out to rock core, wrapped
Stress deformation containing rock core with 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 produce 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
Rate is significantly greater than shallow lateral resistivity, induction motor is significantly greater than lateral resistivity, gamma ray curve increases extremely, resistance
It is abnormal etc. that anomalous variation even zigzag change, spontaneous potential curve and hole diameter occurs in rate curve.Find out according to rock core
Observation, confirms the log of the well section of fracture development, and takes 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.Afterwards, to step（d）In sentence
The fracture development well section of breaking carries out acoustic televiewer log successively（HBTV）Or micro-resisitivity image（FMI or EMI）、
VSP logs well or crosshole seismic well logging.Acoustic televiewer log and micro-resisitivity image are all in imaging logging techniques
One kind, as identification crack effective logging mode most directly perceived, individually carry out an imaging logging operation and be necessary,
Because Image Logging Data can protrude because crack change caused by the variation characteristic of rock acoustic impedance and resistivity, reduce by
Non- crack response influences caused by the human factors such as drilling engineering, so as 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 by the reflectance signature difference of seismic wave with crosshole seismic well logging
Educate situation.On the basis of well-shooting can judge in above-mentioned crack, the journey of fracture development is determined by the strong and weak feature of back wave
Degree, auxiliary aforesaid way are completed comprehensively to recognize rammell crack.Finally, according to above-mentioned all data, individual well section is established
Model, overall merit fracture intensity.
Further, by the step（a）~（g）For the N mouth wells 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, is easy to 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
It is easy to the research of the development scheme to shale oil-gas reservoir, avoids confusion.
The present invention compared with prior art, has the following advantages and advantages：
1st, shale reservoir fracture evaluation method of the present invention, by carrying out core research, well log interpretation, Geologic modeling successively, realize
Comprehensive fracture intensity analysis, and analysis degree is realized comprehensively and accurately from the easier to the more advanced, by rough to finely
Fracture evaluation analysis is carried out to shale reservoir.
2nd, shale reservoir fracture evaluation method of the present invention, on the Research foundation of the next item up step, only have to necessary well section
Targetedly use subsequent step, can the cost-effective and time, improve the efficiency to shale reservoir fracture evaluation.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form 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.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
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 exploration
In development block, according to geological conditions and goal in research demand, the well with symbolical meaningses is chosen, shale reservoir section is taken
Heart operation and detecting earth stress；（b）Electron-microscope scanning observation is carried out to rock core, confirms fracture development section, description and record crack hair
Educate situation and occurrence；（c）Triaxial stress rock strain experiment is carried out to rock core, obtains stress-strain diagram；（d）Carry out resistivity
Well logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density log, calliper log, obtain mesh
The above-mentioned log of the full well section of well is marked, using section curve of coring for confirming fracture development as reference, is judged with reference to well log interpretation
More fracture development well sections；（e）To step（d）In the fracture development well section judged carry out acoustic televiewer log（HBTV）It is or micro-
Resistivity scanning imagery is logged well（FMI or EMI）；（f）To step（d）In the fracture development well section judged carry out VSP well loggings or
Crosshole seismic is logged well；（g）According to above-mentioned all data, individual well section model, overall merit fracture intensity are established.By described in
Step（a）~（g）For the N mouth wells in same oil-gas exploration and development block, N number of individual well section model is established as Reservoir Lithofacies
Threedimensional model, while conventional sandstone reservoir and shale reservoir are made into obvious differentiation.Heretofore described step is carried out successively,
On the Research foundation of the next item up step, subsequent step is targetedly only used to necessary well section, analysis degree can be made by easy
To it is difficult, by rough to fine, while cost-effective and time, realize that comprehensively and accurately carrying out fracture evaluation to shale reservoir divides
Analysis.
Upper described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail it is bright, should be understood that the foregoing is only the present invention embodiment, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in
Within protection scope of the present invention.
Claims (3)
1. shale reservoir fracture evaluation method, it is characterised 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, choose with symbolical meaningses
Well, coring operation and detecting earth stress are carried out 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）Triaxial stress rock strain experiment is carried out to rock core, obtains stress-strain diagram；
（d）Carry out resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density survey
Well, calliper log, the above-mentioned log of the full well section of target well is obtained, to confirm section curve of coring of fracture development as reference,
Judge more fracture development well sections with reference to well log interpretation；
（e）To step（d）In the fracture development well section judged carry out acoustic televiewer log（HBTV）Or microresistivity is scanned into
As well logging（FMI or EMI）；
（f）To step（d）In the fracture development well section judged carry out VSP well loggings or crosshole seismic well logging；
（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：By the step（a）~（g）With
In the N mouth wells 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673382.3A CN107765330A (en) | 2016-08-17 | 2016-08-17 | Shale reservoir fracture evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610673382.3A CN107765330A (en) | 2016-08-17 | 2016-08-17 | Shale reservoir fracture evaluation method |
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| Publication Number | Publication Date |
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| CN107765330A true CN107765330A (en) | 2018-03-06 |
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| CN201610673382.3A Withdrawn CN107765330A (en) | 2016-08-17 | 2016-08-17 | Shale reservoir fracture evaluation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2016
- 2016-08-17 CN CN201610673382.3A patent/CN107765330A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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