CN110529088A - A kind of rock compressibility section method for building up based on thin section identification - Google Patents
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a kind of rock compressibility section method for building up based on thin section identification, the method includes the steps of: 1. obtaining different depth rock core；2. identifying by core wafer and determining its lithology, partial size identification, cementation type, sorting, and evaluation quantification treatment is carried out to acquired parameter, and then establish core wafer compressibility evaluation number；3. identifying its micro crack by core wafer, and obtain intrinsic fracture evaluation number；4. establishing the pressure break complexity seam net based on thin section identification forms predictive index evaluation model；5. evaluating rock compressibility section of the well section based on thin section identification, preferably individual well perforation cluster and section position pressure break well section.This method can obtain providing foundation based on the pressure break well section preferred method of experiment thin section identification for shale, tight sand oil and gas reservoir Efficient Development.
Description
Technical field
The present invention relates to a kind of rock compressibility section method for building up based on thin section identification, belongs to unconventional oil and gas and opens
The technical field of hair, especially in shale, the efficient fracture evaluation method of tight sandstone reservoir.
Background technique
Volume fracturing needs to form criss-cross complex fracture network, increases the contact area of reservoir and pit shaft, and can
Can pressure break evaluation be exactly the ability evaluated reservoir and form fracture network.By reservoir lithology, partial size, particle contact, sorting,
The influence of intrinsic fracture development degree, the ability that each interval of reservoir forms complex fracture network is different, if lacking to reservoir
The research and understanding of compressibility, the then Reservoir Section that can not have been filtered out are constructed, and then influence fracturing effect.Therefore, it studies
Volume fracturing reservoir compressibility evaluation method is particularly significant for the exploitation of shale oil gas, tight sand oil gas.
Intrinsic fracture is the key factor for determining hydraulic fracture crack initiation position and orientation, and reservoir intrinsic fracture is more, volume
The easier formation complex fracture of pressure break.Therefore, reservoir intrinsic fracture is also an important factor for influencing compressibility evaluation.And permitted at present
More rock compressibility evaluation models do not consider the influence of intrinsic fracture but, and the compressibility index of calculating has certain unilateral
Property.Establishing such as CN106097125A and comprehensively consider mineral content brittleness index, elastic parameter brittleness index and fracture toughness
Compressibility evaluation model evaluates the compressibility of tight sand oil and gas reservoir, preferably perforation cluster position and fractured interval, moreover it is possible to
Effectively identify the interlayer of brittleness height in reservoir, compressibility difference；CN106204303A is according to reservoir oil-gas possibility and engineering dessert
Factor, preferably compressibility evaluation parameter, by standardizing reservoir oil-gas possibility parameter, comprehensive mineral constituent content and mesomechanics
Parameter calculates engineering dessert parameter, and constructing can be to the compressibility evaluation model that reservoir is continuously judged, can be more accurate
Ground divides effective fractured interval and blocks interval；Rock mechanics parameters that CN107290799A is calculated according to sound wave measuring well curve,
The peak value compression strength and Residual Compressive Strength that default compression strength model calculates, determine that the synthesis compressibility of target zone rock refers to
Number is the mechanics evaluation of elastoplasticity and plastic period；The characterization that CN104749622A passes through preferred mud shale stratum mechanics
The factor obtains mud shale compressibility integrated data body quantitatively characterizing stratum compressibility in conjunction with prestack parametric inversion.Above method energy
Compressibility evaluation is carried out from the ingredient or mechanical property of rock itself, but has ignored reservoir intrinsic fracture key factor
Influence.
On the other hand, during fracture evaluation, lithology can differentiate whether pressure break reservoir；Main partial size can speculate face
Porosity；Cementing contact type can speculate crack situation, cementing more sparse, and the probability that crack occurs is bigger；Sorting is more uniform, rock
Shi Yue is easily broken, and sorting uneven cementing strength may be bigger.Sandstone Compositions are more preferable, and partial size is bigger, and it is better to sort, cementing to get over
Inclined point, line contact, originally crack is more, then is more easy to produce complex fracture network, and compressibility is better.So being pressed in selection
It should be using reservoir lithology, partial size, particle contact, sorting as significant consideration when splitting well section.Current domestic application well logging money
The method that material carries out brittleness, compressibility evaluation, if CN105445440A is based on landwaste microscopic feature, from mineral brittleness, microcosmic
Mechanics, surface microscopic divide the factors such as shape and surface roughness, obtain the synthesis compressibility index of shale landwaste, finally obtain complete
Synthesis compressibility index longitudinal direction spread of the well based on landwaste microscopic feature.This method evaluates shale from microcosmic angle using landwaste
The method of compressibility does not consider reservoir lithology, partial size, particle contact, the influence of sorting sexual factor but, cannot be sufficiently efficiently excellent
Select reservoir perforating and fracturing well section.
Due to the complexity of volume fracturing reservoir lithology, pore structure and heterogeneity, current compressibility evaluation model
It might not be applicable in.For the compressibility evaluation method of volume fracturing reservoir, existing method is mostly three-dimensional compressibility evaluation
Method, and it is less to the research of individual well optimizing evaluation volume fracturing well section.As CN105134156A is established based on rock core-well
The multiple dimensioned tight sandstone reservoir three-dimensional compressibility evaluation model of eye-reservoir comprehensively considers mineral content, elastic parameter, interior
Angle of friction, strain energy release rate and Fracture Toughness Parameter, obtain any spatial position in tight sandstone reservoir can pressure break
Property.To Mr. Yu's individual well construction fracturing section, reservoir compressibility will not only consider the influence of the factors such as the mineral composition of rock itself,
It should also be connect on the basis of comprehensive understanding well section reservoir Characteristics of The Matural Fractures in conjunction with well section reservoir lithology, partial size, particle
Touching, sorting etc. carry out multifactor compressibility evaluation, and then final preferably perforating and fracturing well section.Therefore now it is badly in need of a kind of comprehensive
The selection method of evaluation volume pressure break well section, to instruct shale oil gas, the design of tight sand oil and gas reservoir individual well fracturing developing.
Summary of the invention
The purpose of the present invention is achieved through the following technical solutions, a kind of rock compressibility section based on thin section identification
Method for building up, including the following steps:
1. obtaining different depth rock core, core wafer is made；
2. being identified by core wafer and determining its lithology, partial size identification, cementation type, sorting, and to acquired parameter
Evaluation quantification treatment is carried out respectively, and then establishes core wafer compressibility evaluation number model:
SFI=W1M+W2D+W3C+W4S
SF in formulaIFor core wafer compressibility evaluation number, dimensionless；Wi (i=1~4) is numberical range 0~1
Weighting coefficient, dimensionless.According to the actual conditions for obtaining being evaluated core wafer, the weighting coefficient of quantization parameter is reasonably selected
Wi.Under no particular/special requirement or the inadequate situation of actual field data, the weighting coefficient of every brittleness index takes 0.25；
3. identifying its microcosmic intrinsic fracture by core wafer, and quantify to obtain intrinsic fracture evaluation number NFI；
4. establishing in conjunction with core wafer compressibility evaluation number, the intrinsic fracture evaluation number 2. 3. sought based on thin
The pressure break complexity seam net of piece identification forms predictive index evaluation model:
FI=SFI·NFI
F in formulaINet, which is stitched, for the pressure break complexity based on thin section identification forms predictive index evaluation number, dimensionless；
5. forming predictive index evaluation number based on the pressure break complexity seam net 4. acquired, evaluation well section rock compressibility is cutd open
Face, preferably individual well perforation cluster and interval position position pressure break well section.
It is an object of the invention to effectively preferred individual well volume fracturing well section, overcome it is existing can fracturing technique to individual well body
Overstock split well section preferably study it is less, while compressibility evaluation ignore intrinsic fracture, reservoir lithology, partial size, particle contact, sorting
The problems such as property.For specific individual well construction fracturing section, need to consider lithology, the partial size, particle contact, sorting of rock itself
The influence of many factors such as property, intrinsic fracture, proposes a kind of rock volume pressure break well section selection method based on thin section identification.This
Method utilizes petrographic microscope thin section identification well section lithology, partial size, particle contact, sorting, intrinsic fracture, establishes multifactor rock
Stone pressure break well section selection method.The evaluation method is intuitive and reliable, accurate and effective, favorably promotion and application on site, for shale
Oil-gas reservoir and the theoretical research of tight sand Reservoir Development and field application all have positive directive significance.
Detailed description of the invention
Fig. 1 is the art of this patent flow chart；
Fig. 2 is the rock compressibility section Distribution Characteristics figure based on thin section identification.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing, but protection scope of the present invention is not limited to following institute
It states.
A kind of rock compressibility section method for building up based on thin section identification, including the following steps:
Below in conjunction with Fig. 1, with the related data instance of certain region X well, the present invention will be further described.
Step is 1.: obtaining different depth rock core according to patch characteristics specific aim, makes core wafer
Step is 2.: carrying out thin section identification by petrographic microscope, determines its lithology, partial size identification, cementation type, sorting
Property, and carry out evaluation quantification treatment respectively to acquired parameter, and then establish core wafer compressibility evaluation number model.
Concrete operations: by treated, core wafer application petrographic microscope is identified, respectively obtains it by analysis processing
Lithology, partial size identification, cementation type, sorting, due to by lithology can differentiate whether reservoir, main partial size can speculate face
Porosity, cementing contact type can speculate crack situation, cementing more sparse, and the probability that crack occurs is bigger, and sorting is more uniform, rock
Shi Yue is easily broken, and sorting uneven cementing strength may be bigger.Therefore, acquired parameter is carried out according to 1-10 grade respectively
Quantification treatment is evaluated, each well interval thin slice parametric data table can be obtained, as shown in table 1:
Each well interval sheet segment physical parameter table of table 1.
And then establish core wafer compressibility evaluation number model (formula 1):
SFI=W1M+W2D+W3C+W4S (1)
SF in formulaIFor core wafer compressibility evaluation number, dimensionless；Wi (i=1~4) is numberical range 0~1
Weighting coefficient, dimensionless.According to the actual conditions for obtaining being evaluated core wafer, the weighting coefficient of quantization parameter is reasonably selected
Wi.Under no particular/special requirement or the inadequate situation of actual field data, the weighting coefficient of every brittleness index takes 0.25；
By calculating, each well interval thin slice compressibility evaluation number tables of data can be obtained, as shown in table 2:
Each well interval sheet segment compressibility evaluation number parameter list of table 2.
3. carrying out thin section identification by petrographic microscope, observation identifies its microcosmic intrinsic fracture developmental state, and evaluation amount
Change intrinsic fracture evaluation number NFI。
Concrete operations: by treated, core wafer application petrographic microscope is identified, handles to obtain by observation analysis micro-
Crack situation is seen, since crack is more developed, rock is more easily broken, and the ability that pressure break forms complicated seam net is bigger.Therefore, by institute
It obtains microcosmic intrinsic fracture parameter and carries out evaluation quantification treatment according to 1-5 grade respectively, each well interval thin slice crack can be obtained and comment
Valence exponent data table, as shown in table 3:
Each well interval sheet segment Cracks character parameter list of table 3.
4. establishing and being reflected based on thin slice in conjunction with core wafer compressibility evaluation number, the intrinsic fracture evaluation number sought
Fixed pressure break complexity seam net forms predictive index evaluation model.
Concrete operations are as follows: in conjunction with the core wafer compressibility evaluation number SF 2. 3. soughtI, intrinsic fracture evaluation refer to
Number NFI, it establishes the pressure break complexity seam net based on thin section identification and forms predictive index evaluation model (formula 2):
FI=SFI·NFI (2)
F in formulaINet, which is stitched, for the pressure break complexity based on thin section identification forms predictive index evaluation number, dimensionless.
By calculating, each well interval can be obtained based on the pressure break complexity seam net of thin section identification and form prediction and evaluation exponent data
Table, as shown in table 4:
Each well interval sheet segment Cracks character parameter list of table 4.
5. forming predictive index evaluation number based on the pressure break complexity seam net acquired, evaluation well section rock compressibility is cutd open
Face, preferably individual well perforation cluster and interval position position pressure break well section.
Concrete operations: it is stitched by the pressure break complexity that the thin section identification of a large amount of rock samples of individual well in goals research region is tested
Net forms predictive index evaluation number, establishes a kind of well section compressibility section based on thin section identification, and then preferably individual well is penetrated
Hole cluster and interval position position pressure break well section.
Predictive index is formed in conjunction with the pressure break complexity seam net based on thin section identification 4. sought, is analyzed based on thin section identification
Rock compressibility section Distribution Characteristics figure (Fig. 2) it is found that individual well in Fig. 2 is specified at region, i.e. at 3627.35m,
Near zone reservoir has preferable compressibility at 3758.75m rock core, should especially pay close attention to such when FRACTURING DESIGN selects layer
Reservoir Section locating for rock core.
The present invention is used for overall merit shale oil gas, tight sand compressibility, has the advantage that (1) considers reservoir
Intrinsic fracture factor carries out scientific evaluation, can be preferred pressure break well section, and efficient perforating and fracturing exploitation provides foundation.(2) using inclined
The method of micro- microscope thin section identification, evaluation procedure precision are high.(3) present invention be lab experiment assessment methods, it is easy to operate can
It leans on.(4) present invention is at low cost, easy to operate, and rapidly, promotional value with higher can be promoted at the scene for evaluation.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to shape described herein
Formula should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be herein
In the contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art are carried out
Modifications and changes do not depart from the spirit and scope of the present invention, then should all be obtained in protection scope in appended claims of the present invention.
Claims (1)
1. a kind of rock compressibility section method for building up based on thin section identification, which is characterized in that this method includes following step
It is rapid:
1. obtaining different depth rock core, core wafer is made；
2. being identified by core wafer and determining its lithology, partial size identification, cementation type, sorting, and acquired parameter is distinguished
Evaluation quantification treatment is carried out, and then establishes core wafer compressibility evaluation number model:
SFI=W1M+W2D+W3C+W4S
SF in formulaIFor core wafer compressibility evaluation number, dimensionless；Wi (i=1~4) is the weighting system of numberical range 0~1
Number, dimensionless；According to the actual conditions for obtaining being evaluated core wafer, the weighting coefficient Wi of quantization parameter is reasonably selected；Do not having
Have in particular/special requirement or the inadequate situation of actual field data, the weighting coefficient of every brittleness index takes 0.25；
3. identifying its microcosmic intrinsic fracture by core wafer, and quantify to obtain intrinsic fracture evaluation number NFI；
4. establishing and being reflected based on thin slice in conjunction with core wafer compressibility evaluation number, the intrinsic fracture evaluation number 2. 3. sought
Fixed pressure break complexity seam net forms predictive index evaluation model:
FI=SFI·NFI
F in formulaINet, which is stitched, for the pressure break complexity based on thin section identification forms predictive index evaluation number, dimensionless；
5. forming predictive index evaluation number based on the pressure break complexity seam net 4. acquired, well section rock compressibility section is evaluated,
It is preferred that individual well perforation cluster and interval position position pressure break well section.
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Cited By (2)
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| CN113236238A (en) * | 2021-05-19 | 2021-08-10 | 西南石油大学 | Method for predicting compressibility index of laminated shale formation |
| CN113586019A (en) * | 2020-04-30 | 2021-11-02 | 中国石油天然气股份有限公司 | Fracturing optimization method and device for shale gas reservoir and computer storage medium |
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| CN113586019B (en) * | 2020-04-30 | 2024-01-30 | 中国石油天然气股份有限公司 | Fracturing optimization method and device for shale gas reservoir and computer storage medium |
| CN113236238A (en) * | 2021-05-19 | 2021-08-10 | 西南石油大学 | Method for predicting compressibility index of laminated shale formation |
| CN113236238B (en) * | 2021-05-19 | 2022-03-01 | 西南石油大学 | Method for predicting compressibility index of laminated shale formation |
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