CN105719339B - A kind of shale gas reservoir laminated structure of shale seam three-dimensional modeling method - Google Patents
A kind of shale gas reservoir laminated structure of shale seam three-dimensional modeling method Download PDFInfo
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Abstract
The present invention provides a kind of shale gas reservoir laminated structure of shale seam three-dimensional modeling method, includes the following steps：Step 1：The shale laminated structure of shale is stitched and the description of the core observation of Lithofacies Types and feature；Step 2：Individual well shale lithofacies pattern extracts and establishes shale lithofacies threedimensional model；Step 3：The individual well shale laminated structure of shale stitches schema extraction and establishes laminated structure of shale seam strength model；Step 4：Establish laminated structure of shale seam discrete model；Step 5：Establish laminated structure of shale seam equivalent model.The method of the present invention, solve shale gas reservoir laminated structure of shale seam 3-D quantitative geological model establishes problem, in shale gas exploitation, will obtain extensive promote and apply.
Description
Technical field
The present invention relates to geological technique fields more particularly to a kind of shale gas reservoir laminated structure of shale to stitch three-dimensional modeling method.
Background technology
Shale gas is that there are the Unconventional gas of marked difference with Unconventional gas such as coal bed gas, compact sandstone gas.
The laminated structure of shale seam extremely developed is the characteristic feature of shale gas reservoir, and it is other very to be substantially distinguished from coal bed gas, compact sandstone gas etc.
Advise natural gas reservoirs.Related laminated structure of shale seam 3-D quantitative geological model establishes nature as the important of shale gas reservoir quantitatively characterizing
Content.
The laminated structure of shale in reducing environment, water energy when being deposited, temperature, salinity and is changed containing object under hydrostatic condition
The geologic record of laminarity for influencing and being left during superfine particle deposits, between these tiny laminas recorded
Physical property it is extremely fine and close, or even passing through for underground water can not be allowed, thus be difficult obtain to come from other local dissolving band it is cementing
Thus substance, not cementing lamina face become fragile face, formed once the concentration of local for tectonic stress occur is easy for inducing
The laminated structure of shale is stitched.Exactly because a large amount of laminated structures of shale that this reason is formed are seamed into for effective channel of shale gas reservoir gas seepage flow, make
Fine and close shale reservoir become can effectively aerogenesis natural gas payzone.And how effectively to establish shale gas reservoir laminated structure of shale seam three
The quantitative geological model of dimension becomes the problem that must be solved in shale gas exploitation.
Since the history that shale gas is developed in China is not grown, even if being also just to become natural gas in the past 30 years to lead in the world
The hot spot in domain.The understanding of related laminated structure of shale seam predominantly stays in the sight in core observation description or under all kinds of electron microscopes
Survey result.Core observation description can describe the development density of laminated structure of shale seam and basic occurrence, but can not be formed in three dimensions
Quantitative geological model.
Laminated structure of shale seam observed result under all kinds of electron microscopes can improve the deep understanding that people stitch the laminated structure of shale, but this recognize
Know and is difficult to obtain further production application because the quantitative geological model of three dimensions laminated structure of shale seam is not formed.
Invention content
It is an object of the invention to solve the problems of the above-mentioned prior art, a kind of shale gas reservoir laminated structure of shale seam three is provided
Tie up modeling method.
A kind of shale gas reservoir laminated structure of shale seam three-dimensional modeling method, includes the following steps：
Step 1：The shale laminated structure of shale is stitched and the description of the core observation of Lithofacies Types and feature；
Step 2：Individual well shale lithofacies pattern extracts and establishes shale lithofacies threedimensional model；
Step 3：The individual well shale laminated structure of shale stitches schema extraction and establishes laminated structure of shale seam strength model；
Step 4：Establish laminated structure of shale seam discrete model；
Step 5：Establish laminated structure of shale seam equivalent model.
Further, the shale gas reservoir laminated structure of shale as described above stitches three-dimensional modeling method, and individual well page is established described in step 2
Rock lithofacies pattern extracts：
The shale Lithofacies Types that each depth location of each well is extracted by individual well lithofacies analysis, by different shale lithofacies
Type coding obtains individual well lithofacies coded data, to form individual well shale lithofacies pattern；
The shale lithofacies threedimensional model includes：The individual well shale lithofacies mould that will be formed by these individual well lithofacies coded datas
Formula inputs modeling software, the discrete variable stochastic simulation algorithm provided using software, you can establish shale lithofacies threedimensional model.
Further, the shale gas reservoir laminated structure of shale as described above stitches three-dimensional modeling method, individual well shale page described in step 3
Reason stitches schema extraction：
On the basis of individual well core analysis and well log interpretation, the width of laminated structure of shale seam and development at different depth position are obtained
The width of laminated structure of shale seam is multiplied with development density and acquires laminated structure of shale seam growth strength data, with rock angle of bedding by density data
As the inclination angle of laminated structure of shale seam, laminated structure of shale seam extends azimuth random value, includes growth strength, inclination angle and azimuthal to be formed
Laminated structure of shale slit die formula.
The foundation of laminated structure of shale seam strength model includes：The laminated structure of shale slit die formula input modeling software of individual well shale is established
The laminated structure of shale stitches strength model.
Further, the shale gas reservoir laminated structure of shale as described above stitches three-dimensional modeling method, and laminated structure of shale seam is established described in step 4
Discrete model includes：
Comparative analysis individual well shale lithofacies pattern and individual well shale laminated structure of shale slit die formula, you can obtain each shale lithofacies pattern
The laminated structure of shale stitch growth strength maximum value, the wherein laminated structure of shale is stitched into shale lithofacies of the growth strength maximum value numerical value close to 0 and is rejected, to
Laminated structure of shale seam developmental index model is set up, is constrained by spatial domain of the model, is inputted and modeled as hard data using shale laminated structure of shale slit die formula
Software, you can establish and obtain laminated structure of shale seam discrete model.
Further, the shale gas reservoir laminated structure of shale as described above stitches three-dimensional modeling method, and laminated structure of shale seam is established described in step 5
Equivalent model includes：
Physical property is oozed in the hole that the different core sample of development degree is stitched by the test laminated structure of shale, and extraction respectively obtains development laminated structure of shale seam
Average pore, the mean permeability value that sample is stitched with the agensis laminated structure of shale stitch sample using development laminated structure of shale seam with the agensis laminated structure of shale
Average pore, mean permeability value be quotient respectively, and seam and the ratio between matrix porosity and permeability using quotient as the laminated structure of shale
Example relationship is based on the proportionate relationship, soft using reservoir modeling on the basis of shale reservoir matrix porosity, penetration rate model
Part can be established to form laminated structure of shale seam equivalent model.
The present invention is studied using lithofacies palaeogeography and core description achievement, establishes laminated structure of shale seam 3 d-dem model, realizes page
Reason seam distributing position, development scale and the three-dimensional visualization for extending orientation；Laminated structure of shale seam three dimensional equivalent model, quantitative table are established simultaneously
Levy the porosity and permeability of reservoir at laminated structure of shale seam distributing position.The modeling result being consequently formed not only is reproduced in three dimensions
The distribution characteristics of laminated structure of shale seam also provides laminated structure of shale seam 3-D quantitative hole for shale gas production simulation and oozes attribute model, to be page
Solid foundation has been established in the scientific and reasonable formulation of rock gas well liquid loading scheme.
Description of the drawings
Fig. 1 is that the shale gas reservoir laminated structure of shale of the present invention stitches three-dimensional modeling method flow chart；
Fig. 2 be the present invention be five peaks of embodiment East Sichuan Basin-Longma small stream group shale gas reservoir typical case's shale lithofacies and
Laminated structure of shale seam development rock core characteristic pattern；
Fig. 3 be the present invention be five peaks of embodiment East Sichuan Basin-Longma small stream group shale gas reservoir individual well shale lithofacies and
The laminated structure of shale stitches distribution characteristics figure；
Fig. 4 is that the present invention is five peaks of embodiment East Sichuan Basin-Longma small stream group shale gas reservoir shale lithofacies three-dimensional mould
Type figure；
Fig. 5 is that the present invention is that five peaks of embodiment East Sichuan Basin-Longma small stream group shale gas reservoir laminated structure of shale stitches intensity three-dimensional
Illustraton of model；
Five peaks of Fig. 6 a East Sichuan Basins of the embodiment of the present invention-Longma small stream group shale gas reservoir laminated structure of shale seam is discrete three-dimensional whole
Illustraton of model；
Fig. 6 b are the discrete three-dimensional office of five peaks of East Sichuan Basin of the embodiment of the present invention-Longma small stream group shale gas reservoir laminated structure of shale seam
Portion's scale-up model figure；
Fig. 7 a are that the present invention is that five peaks of embodiment East Sichuan Basin-Longma small stream group shale gas reservoir equivalent porosity is three-dimensional
Model；
Fig. 7 b are that the present invention is five peaks of the embodiment East Sichuan Basin-directions Longma small stream group shale gas reservoir I equivalent infiltration
Rate threedimensional model；
Fig. 7 c are that the present invention is five peaks of the embodiment East Sichuan Basin-directions Longma small stream group shale gas reservoir J equivalent infiltration
Rate threedimensional model.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the technical solution below in the present invention carries out clear
Chu is fully described by, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The present invention is primarily based on the origin mechanism that the seam development of the shale gas reservoir laminated structure of shale is controlled by shale lithofacies, in shale lithofacies
On the basis of type and pattern, carries out individual well shale lithofacies analysis and establish shale lithofacies using random or Decided modelling method
Threedimensional model forms the spatial domain range of laminated structure of shale seam modeling；Then by core description, the extraction laminated structure of shale stitches feature mode, establishes page
Reason seam strength model, discloses the spatial intensity distribution of laminated structure of shale seam development；Again depending on the laminated structure of shale seam occurrence index model be space about
Beam is established to form laminated structure of shale seam discrete model using laminated structure of shale seam strength model；The laminated structure of shale slot apertures finally obtained using core analysis is oozed
Information is established and completes laminated structure of shale seam equivalent model.
Detailed technical solution flow diagram is as shown in Figure 1.
(1) shale laminated structure of shale seam and the description of the core observation of Lithofacies Types and feature
Shale is usually by depositing the superfine particle substance to get off composition under hydrostatic condition, in reducing environment.The laminated structure of shale is then
Under hydrostatic condition lower part, in reducing environment, by water energy when depositing, temperature, salinity and influenced containing object variation and in pole
The geologic record of the laminarity left in fine-grained sediment deposition process, the physical property between these tiny laminas recorded is extremely
Densification, or even passing through for underground water can not be allowed, thus be difficult to obtain the binding material come from other local dissolving band, without glue
Thus the lamina face of knot becomes fragile face, once the concentration of local for tectonic stress occur, which is easy for inducing, forms laminated structure of shale seam.
It can be seen that the laminated structure of shale seam with shale formed when depositional environment it is closely bound up, this correlation often appears as
The one-to-one relationship of the development and shale lithofacies of laminated structure of shale seam --- as carbonaceous in shale, silicoide increase, the laminated structure of shale is stitched
Density become larger, it is on the contrary then have the tendency that reduction (Fig. 2) --- this understanding obtained by core observation is suitable for almost big absolutely
Most shale gas reservoirs.Therefore, it by establishing shale lithographic model, can be achieved with stitching the effective of development range and scale to the laminated structure of shale
Constraint and control.
In conclusion carrying out core observation, the internal relation disclosed between the development of shale laminated structure of shale seam and Lithofacies Types is this hair
The bright first step is extremely developed as shown in Fig. 2, the laminated structure of shale of high (richness) carbon argillaceous (clayey) siliceous shale is stitched, and in (height)
The laminated structure of shale seam development of carbon argillaceous (clayey) silty shale, with carbonaceous, the reduction of silicoide, the development journey of laminated structure of shale seam
Degree is gradually lowered.
(2) extraction of individual well shale lithofacies pattern and the foundation of shale lithofacies threedimensional model
The shale Lithofacies Types that each depth location of each well can be extracted by individual well lithofacies analysis, by different pages
Rock Lithofacies Types encode, and individual well lithofacies coded data are obtained, to form individual well shale lithofacies pattern；By these individual well shale rocks
Facies model data input commercialized modeling software, the discrete variable stochastic simulation algorithm provided using software, you can establish
Shale lithofacies threedimensional model.
Fig. 3 is five peaks of the East Sichuan Basin-Longma small stream group shale gas reservoir established by individual well shale lithofacies analysis
Individual well shale Lithofacies Types and pattern are encoded into different digital codes per class lithofacies by therein, form for establishing rock
The input data of phase model.
Fig. 4 is to utilize above-mentioned data, and five peaks of the East Sichuan Basin-Longma to be formed is established using Sequential Indicator Simulation Method
Small stream group shale gas reservoir lithographic model.
(3) foundation of individual well shale laminated structure of shale seam schema extraction and laminated structure of shale seam strength model
On the basis of individual well core analysis and well log interpretation organically combine, realize to laminated structure of shale slit width degree and density along well
The quantitative description of deep section.It is further recognized by simultaneously by core analysis：The inclination angle of laminated structure of shale seam is minimum, substantially flat with level
Row；The laminated structure of shale stitches azimuthal directive property unobvious, it is believed that can be freely in 360 degree of ranges.These understanding form page
Manage the feature mode of seam.Since fracture width and density all play invigoration effect to fluid neuron network simultaneously, the laminated structure of shale can be stitched
The product of width and density stitches strength model as the growth strength input modeling software that the laminated structure of shale is stitched to establish the laminated structure of shale.Fig. 3 is
Five peaks of East Sichuan Basin-Longma small stream group shale gas reservoir individual well shale laminated structure of shale seam that analysis is established is stitched by the individual well shale laminated structure of shale
The growth strength that the wherein product of laminated structure of shale slit width degree and density is stitched as the laminated structure of shale is had input modeling software by feature mode.Fig. 5 is
Growth strength data are stitched using the individual well laminated structure of shale, five peaks of the East Sichuan Basin-Longma small stream established using sequential Gaussian simulation method
The group laminated structure of shale stitches intensity threedimensional model.
(4) foundation of laminated structure of shale seam discrete model
By effective combination of rock core and log, while realizing to the division of Lithofacies Types on individual well section,
Also describe the changing rule for changing laminated structure of shale slit width degree and density with well depth, the results showed that：Shale Lithofacies Types are sent out with laminated structure of shale seam
Educating feature, there is one-to-one relationship, this relationship to form the theory that distribution modeling is stitched by the shale lithofacies operative constraint laminated structure of shale
And practical basis.Extremely developed as shown in Fig. 2, the laminated structure of shale of high (richness) carbon argillaceous (clayey) siliceous shale is stitched, and in (height)
The laminated structure of shale seam development of carbon argillaceous (clayey) silty shale, with carbonaceous, the reduction of silicoide, the development journey of laminated structure of shale seam
Degree is gradually lowered.
The distribution of laminated structure of shale gap space can be used as effective with development degree it can be seen that establishing the shale lithographic model obtained
Constraint.This operative constraint shows two aspects；It on the one hand can be according between shale Lithofacies Types and laminated structure of shale seam development characteristics
Correspondence adjustment and correct the laminated structure of shale stitch strength model；On the other hand, comparative analysis individual well shale lithofacies pattern and individual well page
Rock laminated structure of shale slit die formula, you can the laminated structure of shale seam growth strength maximum value of each shale lithofacies pattern is obtained, it will wherein laminated structure of shale seam development
Maximum of intensity numerical value is rejected close to 0 shale lithofacies, developmental index model is stitched to set up the laminated structure of shale, using the model as spatial domain
Constraint inputs modeling software by hard data of shale laminated structure of shale slit die formula, you can establishes and obtains laminated structure of shale seam discrete model.
Comparison diagram 4 and Fig. 5, it can be found that five peaks of East Sichuan Basin-Longma small stream group shale gas reservoir shale lithofacies are three-dimensional
Model stitches the corresponding laminated structure of shale operative constraint of intensity threedimensional model.And it is spatial domain constraint that Fig. 6, which is then using Fig. 4, by by page
Reason seam intensity threedimensional model establishes five peaks of the East Sichuan Basin-Longma small stream group completed using modeling software as primary input
The shale gas reservoir laminated structure of shale stitches discrete threedimensional model, the laminated structure of shale seam distribution density of the model and maintaining substantially unanimously for core analysis.
(5) foundation of laminated structure of shale seam equivalent model
Physical property is oozed in the hole that the different core sample of development degree is stitched by the test laminated structure of shale, and extraction respectively obtains development laminated structure of shale seam
Average pore, the mean permeability value that sample is stitched with the agensis laminated structure of shale stitch sample using development laminated structure of shale seam with the agensis laminated structure of shale
Average pore, mean permeability value be quotient respectively, and seam and the ratio between matrix porosity and permeability using quotient as the laminated structure of shale
Example relationship, is based on the proportionate relationship, on the basis of shale reservoir matrix porosity, penetration rate model, utilizes ripe reservoir
Modeling business software can be established to form laminated structure of shale seam equivalent model, including equivalent porosity threedimensional model, tri- directions I, J, K
Equivalent permeability threedimensional model.Fig. 7 is to establish five peaks of the East Sichuan Basin-Longma small stream group shale gas reservoir laminated structure of shale seam etc. obtained
Imitate porosity threedimensional model, the equivalent permeability threedimensional model in tri- directions I, J, K.
Based on the method for the present invention, solves and problem is established with shale gas reservoir laminated structure of shale seam 3-D quantitative geological model,
In shale gas exploitation, extensive promote and apply will be obtained.
The present invention has stitched three-dimensional modeling process at China's East Sichuan Basin First Five-Year Plan peak-Longma small stream group shale gas laminated structure of shale at present
In applied, bring good economic results in society.
The present invention carries out individual well shale lithofacies analysis, using random or true on the basis of shale Lithofacies Types and pattern
Qualitative Modeling Method establishes shale lithofacies threedimensional model, forms the spatial domain range of laminated structure of shale seam modeling；Then by core description,
It extracts the laminated structure of shale and stitches feature mode, establish laminated structure of shale seam strength model, disclose the spatial intensity distribution of laminated structure of shale seam development；Again depending on page
Reason seam occurrence index model is space constraint, establishes to form laminated structure of shale seam discrete model using laminated structure of shale seam strength model；Finally utilize
The laminated structure of shale slot apertures that core analysis obtains oozes information, establishes and completes laminated structure of shale seam equivalent model.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (3)
1. a kind of shale gas reservoir laminated structure of shale stitches three-dimensional modeling method, which is characterized in that include the following steps：
Step 1：The shale laminated structure of shale is stitched and the description of the core observation of Lithofacies Types and feature；
Step 2：Individual well shale lithofacies pattern extracts and establishes shale lithofacies threedimensional model；
Step 3：The individual well shale laminated structure of shale stitches schema extraction and establishes laminated structure of shale seam strength model；
Step 4：Establish laminated structure of shale seam discrete model；
Step 5：Establish laminated structure of shale seam equivalent model；
The extraction of individual well shale lithofacies pattern is established described in step 2 includes：
The shale Lithofacies Types that each depth location of each well is extracted by individual well lithofacies analysis, by different shale Lithofacies Types
Coding obtains individual well lithofacies coded data, to form individual well shale lithofacies pattern；
The shale lithofacies threedimensional model includes：The individual well shale lithofacies pattern formed by these individual well lithofacies coded datas is defeated
Enter modeling software, the discrete variable stochastic simulation algorithm provided using software, you can establish shale lithofacies threedimensional model；
The individual well shale laminated structure of shale described in step 3 stitches schema extraction：
On the basis of individual well core analysis and well log interpretation, the width of laminated structure of shale seam and development density at different depth position are obtained
Data, by the laminated structure of shale seam width and development density be multiplied acquire the laminated structure of shale seam growth strength data, using rock angle of bedding as
The inclination angle of laminated structure of shale seam, laminated structure of shale seam extend azimuth random value, include growth strength, inclination angle and azimuthal laminated structure of shale to be formed
Slit die formula；
The foundation of laminated structure of shale seam strength model includes：The laminated structure of shale slit die formula input modeling software of individual well shale is established into the laminated structure of shale
Stitch strength model.
2. the shale gas reservoir laminated structure of shale according to claim 1 stitches three-dimensional modeling method, which is characterized in that built described in step 4
The vertical laminated structure of shale stitches discrete model：
Comparative analysis individual well shale lithofacies pattern and individual well shale laminated structure of shale slit die formula, you can obtain the page of each shale lithofacies pattern
The wherein laminated structure of shale is stitched growth strength maximum value numerical value and is rejected close to 0 shale lithofacies, to establish by reason seam growth strength maximum value
It plays the laminated structure of shale and stitches developmental index model, constrained by spatial domain of the model, modeling software is inputted by hard data of shale laminated structure of shale slit die formula,
It can establish and obtain laminated structure of shale seam discrete model.
3. the shale gas reservoir laminated structure of shale according to claim 1 stitches three-dimensional modeling method, which is characterized in that built described in step 5
The vertical laminated structure of shale stitches equivalent model：
By test the laminated structure of shale stitch the different core sample of development degree hole ooze physical property, respectively extraction obtain development the laminated structure of shale seam with not
Average pore, the mean permeability value for developing laminated structure of shale seam sample stitch the flat of sample using development laminated structure of shale seam and the agensis laminated structure of shale
Equal porosity, mean permeability value are quotient respectively, and seam and the ratio between matrix porosity and permeability are closed using quotient as the laminated structure of shale
It is, is using reservoir modeling software on the basis of shale reservoir matrix porosity, penetration rate model based on the proportionate relationship
It can establish to form laminated structure of shale seam equivalent model.
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| 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 |
| CN112507615B (en) * | 2020-12-01 | 2022-04-22 | 西南石油大学 | Intelligent identification and visualization method for lithofacies of continental tight reservoir |
| CN112686994B (en) * | 2020-12-01 | 2022-06-21 | 西南石油大学 | Quantitative identification and three-dimensional characterization method for marine shale lithofacies classification |
| CN112282751B (en) * | 2020-12-01 | 2022-11-25 | 西南石油大学 | Geological engineering three-dimensional coupling compact oil gas horizontal well exploitation detection method |
| CN112505778B (en) * | 2020-12-01 | 2022-03-11 | 西南石油大学 | Three-dimensional in-situ characterization method for heterogeneity of shale storage and generation performance |
| CN112505777B (en) * | 2020-12-01 | 2022-03-11 | 西南石油大学 | Three-dimensional visual representation method for ground stress of compact rock mass |
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