CN110362840A - The fracture evaluation method and system of micro-SFL (MSFL) - Google Patents

The fracture evaluation method and system of micro-SFL (MSFL) Download PDF

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CN110362840A
CN110362840A CN201810253707.1A CN201810253707A CN110362840A CN 110362840 A CN110362840 A CN 110362840A CN 201810253707 A CN201810253707 A CN 201810253707A CN 110362840 A CN110362840 A CN 110362840A
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crack
fracture
aperture
msfl
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CN110362840B (en
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南泽宇
刘志远
李军
张军
李�浩
武清钊
金武军
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
China Petrochemical Corp
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China Petrochemical Corp
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Abstract

The invention discloses a kind of fracture evaluation method and system of micro-SFL (MSFL), which includes: the numerical simulator based on micro-SFL (MSFL), and accumulation aperture in production crack evaluates plate；Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；Aperture is accumulated based on crack, obtains fracture porosity and fracture spacing.The advantage is that: the micro-SFL (MSFL) response pattern in research different parameters crack, establish a kind of accumulation of micro-SFL (MSFL) crack aperture, porosity, density evaluation method, crack quantitative assessment is realized using micro-SFL (MSFL) and its similar electrode system well-log information, provides effective means for crack quantitative assessment.

Description

The fracture evaluation method and system of micro-SFL (MSFL)
Technical field
The present invention relates to conventional logging fracture parameters evaluation method fields, survey more particularly, to a kind of micro shape focusing The fracture evaluation method and system of well.
Background technique
Fracture parameters (accumulation aperture, porosity, density) quantitative assessment is the important problem that well log interpretation faces, and is split Seam had not only been important hydrocarbon pore volume but also had been the migration pathway of low permeability reservoir, whether fracture development, was directly related to oil gas Production capacity, with going deep into for oil-gas exploration and development work, the logging evaluation of fracture-type reservoir has attracted increasing attention.
Since crack and basement rock electrically have significant difference, resistivity logging is the primary hand in current logging evaluation crack Section.Wherein, resistivity imaging logging can evaluate stratum with accurate quantitative analysis and split due to responding intuitive advantage with high resolution Stitch parameter, and pit shaft types of fractures distinguished, have always been considered as be fracture evaluation effective means, however imaging logging by Shallower in investigation depth, fracture extensibility evaluating ability is weaker.Log response numerical simulation is the specific geologic body well logging of research The effective means of response, the method that numerical simulation is mostly used when analytic solutions should not be sought are calculated (Gao Jie, Ke Shizhen, Wei The electrical log Present Status of Numerical Simulation such as precious monarch and trend analysis logging technique, 2010,34 (1): 1-5.).Forefathers use The method of numerical simulation has carried out the laterolog that measures between two parties in pit shaft, induction logging fracture parameters evaluation method certain Research, and achieve preferable effect: Sibbit et al. the 1985 Sibbit models proposed for laterolog give Relationship (Sibbit AM, the Faivre Q.The dual of horizontal joint and upright seam laterolog response and fracture parameters laterolog response in fractured rocks.SPWLA 26th annual logging Symposium.Texas:SPWLA, 1985:17-20.), which is extended to any angle by Luo Zhenyao, and (Luo Zhenyao is with lateral The Primary Study geophysical log .1990 of aperture, 14 (2): 83-92. are accumulated in material computation crack), Gao Jie et al. is discussed (Gao Jie, Liu Chuanqi, Wan Jinbin fracture-type reservoir dual laterolog are rung fracture-type reservoir dual laterolog critical angle influence factor Answer critical angle analysis of Influential Factors logging technique, 2012,36 (5): 456-459)；Wang et al. is discussed relative to stratum Multi-coil system induction logging response feature in the presence of high resistivity fracture, high seam guide, and propose a kind of well logging of cross-dipole acoustic wave with it is more Coil array induction logging, which is combined, determines fracture orientation, the method for length (Wang T, Tang XM, Yu LM, et al.Characterizing fractures with multicomponent induction Measurements.Petrophysics, 2005,46 (1): 42-51) micro-SFL (MSFL) patch borehole wall measurement, relative to side Have electrode assembly small to well logging, induction logging, high resolution can more be reflected in the borehole wall and be deposited by the lesser advantage of wellbore effect Micro crack, often there are micro-SFL (MSFL) exceptions for visible crack development section in real data interpretation process.However, right Formation fracture micro-SFL (MSFL) response investigations are less.
Therefore, it is necessary to develop a kind of fracture evaluation method and system of micro-SFL (MSFL), a kind of microspheroidal is established Aperture, porosity, density evaluation method are accumulated in focused log crack, are logged well using micro-SFL (MSFL) and its similar electrode system Data realizes crack quantitative assessment.
Summary of the invention
The invention proposes a kind of fracture evaluation method and system of micro-SFL (MSFL), can be different by research The micro-SFL (MSFL) response pattern in parameter crack establishes a kind of micro-SFL (MSFL) crack accumulation aperture, porosity, close Spend evaluation method.
According to an aspect of the invention, it is proposed that a kind of fracture evaluation method of micro-SFL (MSFL), the crack are commented Valence method includes:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on the crack, obtains fracture porosity and fracture spacing.
Preferably, the fracture evaluation method further include:
Based on rock core, Image Logging Data, fracture parameters are obtained；
Establish the pass of the fracture parameters and crack accumulation aperture, the fracture porosity and the fracture spacing System carries out verifying and scale to the fracture evaluation method.
Preferably, the crack accumulation aperture evaluation plate is made further include:
According to the electrode plate structure of microspherically focused tool device, the numerical simulator of micro-SFL (MSFL) is established；
It based on the numerical simulator, establishes under the conditions of different basement rock, mud resistivity, the crack accumulation aperture is commented Valence plate.
Preferably, the crack accumulation aperture evaluation plate is the relationship version that aperture and apparent resistivity reduced rate are accumulated in crack Figure.
Preferably, obtaining the crack accumulation aperture includes:
The mud resistivity at a temperature of stratum is determined according to drilling data, obtains crack resistivity；
Based on above and below measurement point in 8-12 meters of ranges apparent resistivity average value, obtain basement rock resistivity；
Based on the crack resistivity and the basement rock resistivity, the calculating formula of the crack accumulation aperture is established.
Preferably, the calculating formula are as follows:
In formula, wfAperture is accumulated for crack；
A, b is fitting parameter, is constant；
RbFor basement rock resistivity；
RmsflFor micro-SFL (MSFL) apparent resistivity；
Wherein, aperture is accumulated to the crack by formula (1) and evaluates chart fitting, obtain fitting parameter a, b, and pass through formula (1) aperture is accumulated in crack described in Continuous plus in Logging Software.
Preferably, the fracture porosity is obtained by following formula:
In formula,For fracture porosity；
wfAperture is accumulated for crack；
L is main thickness of electrode；
θ is crack normal direction and wellbore angular separation；
R is investigation depth.
Preferably, the fracture spacing is that crack accumulation aperture takes upwards divided by statistics gained single fracture aperture It is whole.
It is preferably based on rock core single fracture aperture statistics and image logging interpretation single fracture aperture statistics, obtains institute State single fracture aperture.
According to another aspect of the invention, it is proposed that the fracture evaluation system of micro-SFL (MSFL) a kind of, the crack Evaluation system includes:
Memory is stored with computer executable instructions；
Processor, the processor run the computer executable instructions in the memory, execute following steps:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on the crack, obtains fracture porosity and fracture spacing.
The fracture evaluation method and system of a kind of micro-SFL (MSFL) according to the present invention, the advantage is that: research is not The micro-SFL (MSFL) response pattern in same parameter crack, establish a kind of micro-SFL (MSFL) crack accumulation aperture, porosity, Density evaluation method realizes crack quantitative assessment using micro-SFL (MSFL) and its similar electrode system well-log information, is crack Quantitative assessment provides effective means.
Method and system of the invention have other characteristics and advantages, will be in the attached drawing and subsequent tool being incorporated herein It is stated in detail in body embodiment, these the drawings and specific embodiments are used together to explain specific principle of the invention.
Detailed description of the invention
Exemplary embodiment of the present is described in more detail in conjunction with the accompanying drawings, of the invention is above-mentioned and other Purpose, feature and advantage will be apparent, wherein in exemplary embodiments of the present invention, identical appended drawing reference is usual Represent same parts.
Fig. 1 shows a kind of fracture evaluation side of micro-SFL (MSFL) of an exemplary embodiment according to the present invention The flow chart of the step of method.
Fig. 2 shows the micro-SFL (MSFL) fractured reservoirs of an exemplary embodiment according to the present invention to simulate mould The schematic diagram of type.
Fig. 3 a and Fig. 3 b respectively illustrate the different basement rock resistivity conditions of an exemplary embodiment according to the present invention Under crack accumulation aperture evaluation plate schematic diagram.
Fig. 4 shows the micro-SFL (MSFL) investigative range internal fissure point of an exemplary embodiment according to the present invention The schematic diagram of cloth.
Fig. 5 shows the schematic diagram of the A well fracture parameters evaluation achievement of an exemplary embodiment according to the present invention.
Specific embodiment
The present invention will be described in more detail below with reference to accompanying drawings.Although showing the preferred embodiment of the present invention in attached drawing, However, it is to be appreciated that may be realized in various forms the present invention and should not be limited by the embodiments set forth herein.On the contrary, providing These embodiments are of the invention more thorough and complete in order to make, and can will fully convey the scope of the invention to ability The technical staff in domain.
The present invention provides a kind of fracture evaluation method of micro-SFL (MSFL), which includes:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on crack, obtains fracture porosity and fracture spacing.
Further, fracture evaluation method further include:
Based on rock core, Image Logging Data, fracture parameters are obtained；
It establishes fracture parameters and aperture, the relationship of fracture porosity and fracture spacing, fracture evaluation method is accumulated in crack Carry out verifying and scale.
Wherein, verifying refers to that the parameters with depth variation tendencies such as the crack accumulation aperture of calculating should be with rock core, imaging logging The fracture parameters trend that data provides is consistent；If scale refers to that the fracture parameters that the invention calculates and rock core, imaging logging calculate Parameter it is inconsistent, but have certain correlation, find out the relationship of the two, be by parameter conversions such as fracture apertures that the invention calculates Rock core, imaging fracture aperture.
Preferably, production crack accumulation aperture evaluates plate further include:
According to the electrode plate structure of microspherically focused tool device, the numerical simulator of micro-SFL (MSFL) is established；
It based on numerical simulator, establishes under the conditions of different basement rock, mud resistivity, crack accumulates aperture and evaluates plate.
Wherein, crack accumulation aperture evaluation plate is the relationship domain that aperture and apparent resistivity reduced rate are accumulated in crack.
Specifically, according to microspherically focused tool device electrode plate structure, establishing stratum, there are micro shape focusings when crack to survey Well numerical simulator is split when calculating the different mud resistivity of at least two groups and basement rock resistivity using numerical simulation technology Micro-SFL (MSFL) apparent resistivity when stitching accumulation degree from 10 μm of -10cm.
To calculate gained apparent resistivity/basement rock resistivity as ordinate, using crack accumulation aperture as abscissa, for difference Basement rock resistivity makes the crack accumulation aperture evaluation plate of different basement rock resistivity
Preferably, obtaining crack accumulation aperture includes:
The mud resistivity at a temperature of stratum is determined according to drilling data, obtains crack resistivity；
Based on above and below measurement point in 8-12 meters of ranges apparent resistivity average value, obtain basement rock resistivity；
Based on crack resistivity and basement rock resistivity, the calculating formula of crack accumulation aperture is established.
Wherein, calculating formula are as follows:
In formula, wfAperture is accumulated for crack；
A, b is fitting parameter, is constant；
RbFor basement rock resistivity；
RmsflFor micro-SFL (MSFL) apparent resistivity；
Wherein, aperture is accumulated by formula (1) fracture and evaluates chart fitting, obtain fitting parameter a, b, and pass through formula (1) Aperture is accumulated in Continuous plus crack in Logging Software.
Wherein, fracture parameters include fracture porosity and fracture spacing.
Specifically, the calculating of fracture porosity: false since micro-SFL (MSFL) is obvious to the response of main electrode crack is close to If the crack for being close to main electrode has only been reacted in micro-SFL (MSFL) response, therefore is split for can be used with the crack that wellbore is directly handed over Seam accumulation aperture, can be by volume shared by crack divided by microspheroidal for dipping fracture divided by main electrode THICKNESS CALCULATION fracture porosity Focused log crack sensitive range calculates fracture porosity.
Further, if known crack and wellbore normal direction angle are θ:
Preferably, fracture porosity is obtained by following formula:
In formula,For fracture porosity；
wfAperture is accumulated for crack；
L main electrode thickness；
θ is crack normal direction and wellbore angular separation；
R is investigation depth.
Preferably, fracture spacing is that crack accumulation aperture rounds up divided by statistics gained single fracture aperture.
Specifically, the calculating of fracture spacing: region single fracture aperture average value can unite according to rock core single fracture aperture Meter, image logging interpretation single fracture aperture statistics obtain, and after calculating crack accumulation aperture, fracture development density is crack Accumulation aperture rounds up again divided by statistics gained single fracture aperture.
Further, after calculating crack accumulation aperture, porosity, density, the rock core measurement that can establish same depth is split It stitches parameter or image logging interpretation fracture parameters and chart method calculates the relationship of fracture parameters, this method calculated result is carved Degree, to improve Explanation Accuracy.
Wherein, if scale refers to that the parameter for the fracture parameters and rock core, imaging logging calculating that the invention calculates is inconsistent, but There is certain correlation, find out the relationship of the two, is that rock core, imaging crack are opened by parameter conversions such as fracture apertures that the invention calculates Degree.
By studying the micro-SFL (MSFL) response pattern in different parameters crack, establishes a kind of micro-SFL (MSFL) and split Seam accumulation aperture, porosity, density evaluation method are split using micro-SFL (MSFL) and its similar electrode system well-log information realization Quantitative assessment is stitched, provides effective means for crack quantitative assessment.
The invention also provides a kind of fracture evaluation system of micro-SFL (MSFL), which includes:
Memory is stored with computer executable instructions；
Processor, the computer executable instructions in processor run memory execute following steps:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on crack, obtains fracture porosity and fracture spacing.
Embodiment 1
Fig. 1 shows a kind of fracture evaluation side of micro-SFL (MSFL) of an exemplary embodiment according to the present invention The flow chart of the step of method.
As shown in Figure 1, the present embodiment proposes a kind of fracture evaluation method of micro-SFL (MSFL), comprising:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on crack, obtains fracture porosity and fracture spacing.
Further, fracture evaluation method further include:
Based on rock core, Image Logging Data, fracture parameters are obtained；
It establishes fracture parameters and aperture, the relationship of fracture porosity and fracture spacing, fracture evaluation method is accumulated in crack Carry out verifying and scale.
Fig. 2 shows the micro-SFL (MSFL) fractured reservoirs of an exemplary embodiment according to the present invention to simulate mould The schematic diagram of type.Fig. 3 a and Fig. 3 b respectively illustrate the different basement rock resistivity items of an exemplary embodiment according to the present invention The schematic diagram of crack accumulation aperture evaluation plate under part.
Wherein, according to microspherically focused tool device electrode plate structure, establishing stratum, there are micro-SFL (MSFL)s when crack Numerical simulator, as shown in Figure 2.Using numerical simulation technology, computation of mud resistivity is 0.025ohmm, 0.2ohmm, base Rock resistivity is 50ohmm, when 500ohmm, micro-SFL (MSFL) apparent resistivity when aperture is accumulated from 10 μm of -1cm in crack, with Calculating gained apparent resistivity/basement rock resistivity is ordinate, using crack accumulation aperture as abscissa, for different basement rock resistance Rate makes the crack accumulation aperture evaluation plate of different basement rock resistivity, as shown in Figure 3a and Figure 3b shows.
Mud resistivity at a temperature of stratum is determined according to drilling data, it is believed that crack resistivity is equal to mud resistivity.It adopts Use within the scope of 10 meters of measurement point apparent resistivity average value as basement rock resistivity.By using form shown in formula (1) to Fig. 3 a and Chart fitting shown in Fig. 3 b determines fitting parameter a, b, can establish crack accumulation aperture calculating formula, can adopt in Logging Software Aperture is accumulated with the fitting formula Continuous plus crack.
Wherein, calculating formula are as follows:
In formula, wfAperture is accumulated for crack；
A, b is fitting parameter, is constant；
RbFor basement rock resistivity；
RmsflFor micro-SFL (MSFL) apparent resistivity；
Fig. 4 shows the micro-SFL (MSFL) investigative range internal fissure point of an exemplary embodiment according to the present invention The schematic diagram of cloth.
Fracture porosity calculates:
Since micro-SFL (MSFL) is obvious to the response of main electrode crack is close to, it is assumed that micro-SFL (MSFL) response is only anti- The crack for being close to main electrode is answered, therefore for crack accumulation aperture can be used divided by main electrode thickness with the crack that wellbore is directly handed over Fracture porosity is calculated, dipping fracture can be calculated volume shared by crack divided by micro-SFL (MSFL) crack sensitive range Fracture porosity, the distribution of investigative range internal fissure are as shown in Figure 4.If specific known crack and wellbore normal direction angle are θ, Conversion relation can be indicated with formula (2):
In formula,For fracture porosity；
wfAperture is accumulated for crack；
L is main thickness of electrode；
θ is crack normal direction and wellbore angular separation；
R is investigation depth.
Fracture spacing calculates:
Region single fracture aperture average value can be counted according to rock core single fracture aperture, image logging interpretation single crack Aperture statistics obtains, and after calculating crack accumulation aperture, fracture development density is that crack accumulation aperture is single divided by statistics gained Crack aperture rounds up again.
Embodiment 2
Fig. 5 shows the schematic diagram of the A well fracture parameters evaluation achievement of an exemplary embodiment according to the present invention.
By the fracture evaluation method of embodiment 1 to the slit formation densification sand of the southwestern Ordos Basin Red River oil field A well Rock reservoir is handled.
As shown in figure 5, A well has carried out micro-SFL (MSFL) (electrode system is similar to micro-SFL (MSFL)) and electricity simultaneously Resistance rate imaging logging operation.Universally recognized image logging interpretation achievement can be used to carry out micro-SFL (MSFL) explanation results Verifying.From Image Logging Data as it can be seen that 2060m-2070m sections of A well there are three fracture development section, this section of coring lithology is light gray Argillaceous siltstoue, light grey packsand, Dark grey mud stone, the visible oil mark of well logging are drilled into a small amount of bubble liquid level of this layer of time slot mask Go up, fracture development section conventional logging explains conclusion as rift oil-lenses, and slightly expanding on log, three porosity curve increases Greatly, induction logging apparent resistivity reduces, and micro-SFL (MSFL) apparent resistivity curve is substantially reduced, curve descending depth position with Imaging logging observes that penetration of fracture position is corresponding preferable.
The fracture evaluation method for demonstrating micro-SFL (MSFL) can calculate crack accumulation aperture, fracture porosity and split Stitch density.Gained fracture parameters will be calculated to compare with imaging logging calculating fracture parameters, provided for crack quantitative assessment Effective means.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport In the principle, practical application or improvement to the technology in market for best explaining each embodiment, or make the art Other those of ordinary skill can understand each embodiment disclosed herein.

Claims (10)

1. a kind of fracture evaluation method of micro-SFL (MSFL), which is characterized in that the fracture evaluation method includes:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on the crack, obtains fracture porosity and fracture spacing.
2. the fracture evaluation method of micro-SFL (MSFL) according to claim 1, wherein the fracture evaluation method is also Include:
Based on rock core, Image Logging Data, fracture parameters are obtained；
It establishes the fracture parameters and aperture, the relationship of the fracture porosity and the fracture spacing is accumulated in the crack, it is right The fracture evaluation method carries out verifying and scale.
3. the fracture evaluation method of micro-SFL (MSFL) according to claim 1, wherein make the crack accumulation and open Degree evaluation plate further include:
According to the electrode plate structure of microspherically focused tool device, the numerical simulator of micro-SFL (MSFL) is established；
It based on the numerical simulator, establishes under the conditions of different basement rock, mud resistivity, the crack accumulation aperture evaluation figure Version.
4. the fracture evaluation method of micro-SFL (MSFL) according to claim 3, wherein the crack accumulation aperture is commented Valence plate is the relationship domain that aperture and apparent resistivity reduced rate are accumulated in crack.
5. the fracture evaluation method of micro-SFL (MSFL) according to claim 1, wherein obtain the crack accumulation and open Degree includes:
The mud resistivity at a temperature of stratum is determined according to drilling data, obtains crack resistivity；
Based on above and below measurement point in 8-12 meters of ranges apparent resistivity average value, obtain basement rock resistivity；
Based on the crack resistivity and the basement rock resistivity, the calculating formula of the crack accumulation aperture is established.
6. the fracture evaluation method of micro-SFL (MSFL) according to claim 5, wherein the calculating formula are as follows:
In formula, wfAperture is accumulated for crack；
A, b is fitting parameter, is constant；
RbFor basement rock resistivity；
RmsflFor micro-SFL (MSFL) apparent resistivity；
Wherein, aperture is accumulated to the crack by formula (1) and evaluates chart fitting, obtain fitting parameter a, b, and pass through formula (1) Aperture is accumulated in crack described in Continuous plus in Logging Software.
7. the fracture evaluation of micro-SFL (MSFL) according to claim 1, wherein obtain the crack hole by following formula Porosity:
In formula,For fracture porosity；
wfAperture is accumulated for crack；
L is main thickness of electrode；
θ is crack normal direction and wellbore angular separation；
R is investigation depth.
8. the fracture evaluation of micro-SFL (MSFL) according to claim 1, wherein the fracture spacing is the crack Accumulation aperture rounds up divided by statistics gained single fracture aperture.
9. the fracture evaluation of micro-SFL (MSFL) according to claim 8, wherein united based on rock core single fracture aperture Meter and image logging interpretation single fracture aperture statistics, obtain the single fracture aperture.
10. a kind of fracture evaluation system of micro-SFL (MSFL), which is characterized in that the fracture evaluation system includes:
Memory is stored with computer executable instructions；
Processor, the processor run the computer executable instructions in the memory, execute following steps:
Numerical simulator based on micro-SFL (MSFL), production crack accumulation aperture evaluate plate；
Plate is evaluated based on crack accumulation aperture, crack is obtained and accumulates aperture；
Aperture is accumulated based on the crack, obtains fracture porosity and fracture spacing.
CN201810253707.1A 2018-03-26 2018-03-26 Crack evaluation method and system for micro-spherical focused logging Active CN110362840B (en)

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