CN106501146A - A kind of compact oil reservoir physical property upper limit determines method and device - Google Patents
A kind of compact oil reservoir physical property upper limit determines method and device Download PDFInfo
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Abstract
The embodiment of the present application determines method and device there is provided a kind of compact oil reservoir physical property upper limit.Wherein method includes：Meticulous pool description is carried out to target low-permeability oil deposit, obtains the detailed geological model of the target low-permeability oil deposit；According to the detailed geological model, determine in the target low-permeability oil deposit and meet pre-conditioned interval of interest；The air permeability of rock core sample and free-boundary problem data in the interval of interest are obtained, and generates the relation curve of air permeability and free-boundary problem；Determine the air permeability corresponding to catastrophe point in the relation curve, the catastrophe point is the maximum point of the relation curve mean curvature.The embodiment of the present application can quantitatively determine the compact oil reservoir physical property upper limit, so as to the selection development scheme for instructing operation field scientific and reasonable.
Description
Technical field
The application is related to unconventionaloil pool and hides exploration and development field, determines more particularly, to a kind of compact oil reservoir physical property upper limit
Method and device.
Background technology
The whole world is made a general survey of, in the third time energy major transformation trend for marching toward new forms of energy from traditional oil gas, unconventionaloil pool
Resource undoubtedly will become most real resource type in this change.Fine and close oil is to continue with global unconventionaloil pool after shale gas
The another focus of exploration and development, is referred to as " dark fund " by petroleum industry.Although fine and close oil is very real oil making ＆ breaking,
Be due to fine and close oil exploration and development and correlational study also in the elementary step, overall degree of prospecting and geological knowledge degree compared with
Low, a lot of problems for needing to inquire into solution are still suffered from exploration and development.
Due to the characteristic of compact oil reservoir itself, want to obtain effective volume production and must be arranged using the effective exploitation for its characteristic
Apply and can just realize.At present the existing common recognition of educational circles is exactly the LOW PERMEABILITY RESERVOIR reservoir only below a certain physical property higher limit
Middle can just form the low-abundance fine and close oil-gas accumulation of large area, but specifically this boundary is what goes back the mark of neither one determination
Accurate.Although for how to determine that this physical property boundary, Chinese scholars propose various methods, these methods can be divided into three
Class, a kind of drawn based on exploration and development experience, this method interference from human factor is very big；Also a kind of based on typical tight
Oil reservoir statistics draw, the method complex operation；Another kind of method is by determining that indirectly permeability is realized, first really
Determine oiliness, then determine porosity, finally determine permeability.The final purpose of oil reservoir research is to develop, but regrettably above-mentioned
Method all directly can not simply set up contacting between the compact oil reservoir physical property upper limit and effective exploitation.
Content of the invention
The purpose of the embodiment of the present application is that providing a kind of compact oil reservoir physical property upper limit determines method and device, can be direct
The compact oil reservoir physical property upper limit is quantitatively determined from effective exploitation angle, so as to the selection exploitation side for instructing operation field scientific and reasonable
Formula.
For reaching above-mentioned purpose, the embodiment of the present application determines method there is provided a kind of compact oil reservoir physical property upper limit, the side
Method includes：
Meticulous pool description is carried out to target low-permeability oil deposit, obtains the fine geology mould of the target low-permeability oil deposit
Type；
According to the detailed geological model, determine in the target low-permeability oil deposit and meet pre-conditioned interval of interest；
The data of the air permeability of rock core sample and free-boundary problem in the interval of interest are obtained, and generates air
Permeability and the relation curve of free-boundary problem；
Determine the air permeability corresponding to catastrophe point in the relation curve, the catastrophe point is in the relation curve
The point of maximum curvature.
It is that the embodiment of the present application additionally provides a kind of compact oil reservoir physical property upper limit determining device, the dress up to above-mentioned purpose
Put including：
Describing module, for carrying out meticulous pool description to target low-permeability oil deposit, obtains the target low-permeability oil deposit
Detailed geological model；
Reservoir description module, for carrying out meticulous pool description to target low-permeability oil deposit, obtains the target hyposmosis
The detailed geological model of oil reservoir；
Target zone determining module, meets for according to the detailed geological model, determining in the target low-permeability oil deposit
Pre-conditioned interval of interest；
Generation module is obtained, for obtaining the air permeability of rock core sample and free-boundary problem in the interval of interest
Data, and generate the relation curve of air permeability and free-boundary problem；
Catastrophe point determining module, for determining the air permeability in the relation curve corresponding to catastrophe point, described prominent
Height is the maximum point of the relation curve mean curvature.
The technical scheme provided from above-described embodiment, it is low that the present embodiment passes through the data genaration of rock core sample target
Permeability hides the relation curve between air permeability and free-boundary problem.Air permeability and startup in target LOW PERMEABILITY RESERVOIR
Gradient curve mean curvature maximum point, is exactly point that free-boundary problem is undergone mutation.In conjunction with only in a certain physical property
The low-abundance fine and close oil-gas accumulation of large area can be just formed in LOW PERMEABILITY RESERVOIR reservoir below limit value, and fine and close oil-gas reservoir only has
Just there can be economic output under larger displacement pressure, i.e., the characteristics of free-boundary problem is larger, it may be determined that free-boundary problem
The air permeability of catastrophe point should just correspond to the physical property upper limit of compact oil reservoir.Air permeability is close with oil gas effective exploitation
Cut is closed, and is conducive to the scientific and reasonable later development that instructs from air permeability as the physical property upper limit, and the application is implemented
Air permeability is directly obtained in example, it is not necessary to which by other means are obtained indirectly, simple to operate.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present application, constitutes the embodiment of the present application
A part, does not constitute the restriction to the embodiment of the present application.In the accompanying drawings：
Fig. 1 determines method flow schematic diagram for a kind of compact oil reservoir physical property upper limit of the embodiment of the present application；
Air permeability and free-boundary problem Core analysis schematic diagram of the Fig. 2 for the embodiment of the present application；
Fig. 3 determines method flow schematic diagram for another kind of compact oil reservoir physical property upper limit of the embodiment of the present application；
A kind of compact oil reservoir physical property upper limit determining device schematic diagrams of the Fig. 4 for the embodiment of the present application.
Specific embodiment
For making purpose, technical scheme and the advantage of the embodiment of the present application become more apparent, with reference to embodiment and attached
Figure, is described in further details to the embodiment of the present application.Here, the schematic description and description of the embodiment of the present application is used for
The embodiment of the present application is explained, but is not intended as the restriction to the embodiment of the present application.
Below in conjunction with the accompanying drawings, the specific embodiment of the embodiment of the present application is described in further detail.
Fig. 1 is the schematic flow sheet that a kind of compact oil reservoir physical property upper limit of the embodiment of the present application determines method.Such as institute in Fig. 1
Show, a kind of compact oil reservoir physical property upper limit determines that method can include：
S101, carries out meticulous pool description to target low-permeability oil deposit, obtains the target low-permeability oil deposit subtly
Matter model.
The LOW PERMEABILITY RESERVOIR is often referred in oil reservoir reservoir permeability≤50 × 10-3μm2Between oil reservoir, with permeability
Low, the characteristics of abundance is low, single well productivity is low.
After the meticulous pool description refers to oil field input exploitation, with the intensification and dynamic and static data increasing of recovery percent
Plus, the fine geology properties study for being carried out and remaining oil distribution are described, and the mistake of the geological model of constantly improve reservoir prediction
Journey.The detailed geological model can be a data volume for carrying out geologic description to target reservoir.
Here carry out meticulous pool description to target low-permeability oil deposit may comprise steps of.Wherein, the target is low
Infiltration oil reservoir can be the LOW PERMEABILITY RESERVOIR in region to be studied.
(1) data of the information such as geology, earthquake, well logging and the formation testing pilot production of target low-permeability oil deposit is obtained first.
(2) data in conjunction with information such as the geology, earthquake, well logging and formation testing pilot productions carries out meticulous pool description.
S102, according to the detailed geological model, determines in the target low-permeability oil deposit and meets pre-conditioned purpose
Interval.
Can embody in the detailed geological model that reservoir description is obtained the overall geologic feature of the target low-permeability oil deposit with
And the details geologic feature of each interval of interest.Wherein, the geologic feature does not singly refer to a certain item specific features, but a lot of special
The set that levies.In one embodiment of the application, the geologic feature can include：The stratum of reservoir, construction, lithology, deposition,
The features such as anisotropism, reservoir properties, physical properties of fluids.Described meet pre-conditioned can for the purpose of interval details geologic feature
Data are closest with the overall geologic feature of overall goal low-permeability oil deposit, i.e., the interval of interest is most generation in target reservoir
The interval of interest of table.
In one embodiment of the application, described determine in the target low-permeability oil deposit meet pre-conditioned purpose
Interval, may comprise steps of.
Basis obtains detailed geological model data volume to the oil pool analysis of target LOW PERMEABILITY RESERVOIR first, the number in the data volume
According to the overall geologic feature that can reflect the target reservoir.
Further according to specific interval of interest details geologic feature in detailed geological model, the entirety with the target reservoir is determined
Character numerical value interval of interest position the most close.
For example, in a specific embodiment of the application, connect with the character numerical value reflected by detailed geological model the most
Near interval of interest is 1500-1800m, and that interval of interest for being considered as 1500-1800m is to meet default bar in the target reservoir
The interval of interest of part, i.e., most representational interval of interest.Here select special with the items of the overall geologic feature of target reservoir
Levy the closest interval of interest position of numerical value and can ensure that subsequent experimental data can embody the entirety of the target LOW PERMEABILITY RESERVOIR
Property.
S103, obtains the air permeability and free-boundary problem data of rock core sample in the interval of interest, and generates
Air permeability and the relation curve of free-boundary problem.
In one embodiment of the application, described obtain in the interval of interest air permeability of rock core sample and open
Dynamic pressure gradient data, specifically includes following steps.
(1) rock core sample of predetermined number in the interval of interest is obtained.
The process for obtaining rock core sample refers to that acquisition is cored and obtains rock core sample.
(2) air permeability and free-boundary problem that the rock core displacement test of each rock core sample is obtained are obtained
Data.
The rock core sample is carried out rock core displacement test, the air permeability of each rock core sample is obtained and is started pressure
The data of power gradient.
The free-boundary problem and air that corresponding one group of each rock core sample is measured using the experiment of rock core water drive oozes
The data of rate, the free-boundary problem of each rock core sample and air permeability are plotted in Core analysis thoroughly,
Can be obtained by the experimental result of the relation curve of air permeability and free-boundary problem.
S104, determines the air permeability corresponding to catastrophe point in the relation curve, and the catastrophe point is the relation
The maximum point of curve mean curvature.
Air permeability corresponding to the catastrophe point can be the densification that the target low-permeability oil deposit is located in research area
The reservoir characteristics upper limit.Although current Chinese scholars are to going back the unified suggestion of neither one in compact oil reservoir physical property upper limit standard,
But it is that everybody approves to have a common recognition.That be exactly compact oil reservoir for general LOW PERMEABILITY RESERVOIR, required opens
Dynamic pressure gradient is bigger.On the other hand, also one common recognition is exactly to meet necessarily between free-boundary problem and air permeability
Functional relationship, and air permeability is a physical quantity related to production development practice.It is therefore possible to use starting pressure
In the Core analysis of gradient and air permeability, the air permeability conduct corresponding to point that free-boundary problem is increased dramatically
The physical property upper limit of compact oil reservoir.
Embodiment as shown in Figure 1 understands, by the rock core sample of LOW PERMEABILITY RESERVOIR to be studied, generates and starts pressure and sky
The Core analysis of gas permeability, obtain relation between the two.Further according to compact oil reservoir for general LOW PERMEABILITY RESERVOIR, institute
The bigger principle of the free-boundary problem of needs, the air permeability corresponding to point that pressure is increased dramatically in choice relation plate
As the physical property upper limit of compact oil reservoir, so as to finally determine the physical property upper limit of compact oil reservoir, can carry for subsequent production exploitation
For reference.
In one embodiment of the application, when S104 is embodied as.The free-boundary problem for being obtained according to experiment first
And the fitting of air permeability data obtains the concrete functional relation of free-boundary problem and air permeability.Further according to concrete
The position of functional relation calculated curve mean curvature maximum point, so as to obtain the air permeability of catastrophe point, using the numerical value as
Compact oil reservoir physical property upper limit boundary.
In one embodiment of the application, free-boundary problem meets power function relationship with air permeability.According to plan
The power function expression formula for obtaining is closed, the maximum point of calculated curve mean curvature, so that obtain the air permeability corresponding to the point
Numerical value.
Certain relation, and the free-boundary problem value of compact oil reservoir are met according to free-boundary problem and air permeability
Larger, the point that free-boundary problem is undergone mutation by the present embodiment with free-boundary problem value in air permeability curve is that is, bent
The physical property upper limit of the air permeability corresponding to the maximum point of rate as compact oil reservoir.And air permeability is and production practices
A related amount, selects the air permeability physical property upper limit the most provide reference to subsequent development.
In one embodiment of the application, meet that pre-conditioned interval of interest cored when, quantity of coring
It is no less than 10.In the present embodiment, quantity of coring is to ensure that no less than 10 is drawing air permeability and is starting pressure
Accuracy during power gradient relation plate.Data volume is very few in fitting, and error will be than larger, so as to cause to finally give
Air permeability higher limit accuracy reduces.
In a specific embodiment of the application, target low-permeability oil deposit is Changqing oilfields Triassic Yanchang Formation oil reservoir.
The oil reservoir is the important Exploration of Low-permeability Oil Reservoirs development block of Ordos Basin.The fine and close oil of Ordos Basin prolongation group is main
Develop in half deep lake-depth lacustrine facies area, fine and close to extend Member 6 of Yanchang Formation oil reservoir group in the middle part of 7 sections of oil reservoir group tight sands of group and lake basin
Sandstone is the most typical.Based on above cognition, the prolongation group oil reservoir can omit reservoir description and determine representative interval of interest two
Individual step.Cored by interval of interest, and carry out rock core displacement test, obtain 15 groups of air permeabilities, free-boundary problems
Data.Go out Ordos Basin prolongation group oil reservoir air permeability using Excel Software on Drawing bent with free-boundary problem relation
Line, as shown in Figure 2.The fitting expression that the curve is obtained through over-fitting is：
Y=0.22x-1.212(1)
In formula, x represents that air permeability, y represent free-boundary problem.
Curvature formulations are：
Wherein, K represents curvature.
According to above curvature formulations, the curvature formulations of air permeability and free-boundary problem fitting expression can be obtained
For：
Make f (x)=k, if it is desired to K maximum, it is necessary to seek f'(x)=0 root.
Make f'(x)=0, i.e.,：
Obtain X=0.551268.
Therefore, when air permeability is 0.551268mD, air permeability is with free-boundary problem curve mean curvature most
Greatly, you can the Ordos Basin prolongation group compact oil reservoir physical property upper limit is defined as air permeability for 0.551268mD.
In above-described embodiment, by carrying out displacement to the rock core sample of typical interval of interest in Ordos Basin prolongation group
Experiment, obtains the relation curve of air permeability and free-boundary problem.In conjunction with compact oil reservoir relative to general LOW PERMEABILITY RESERVOIR
For, the bigger principle of required free-boundary problem, the sky corresponding to point that pressure is increased dramatically in choice relation plate
The physical property upper limit of the gas permeability as compact oil reservoir, so as to finally determine the physical property upper limit of compact oil reservoir, can be follow-up raw
Produce exploitation and reference is provided.
As shown in figure 3, additionally providing another kind of compact oil reservoir physical property upper limit determination side in one embodiment of the application
Method, methods described may comprise steps of.
S301, carries out meticulous pool description to target low-permeability oil deposit, obtains the target low-permeability oil deposit subtly
Matter model.
S302, the detailed geological model is modified, and obtains revised detailed geological model.
On the basis of the detailed geological model, using oil reservoir Careful Numerical Simulation means, fully investigate dynamic and quiet
State data the detailed geological model is carried out reservoir modeling study to revise repeatedly, perfect, so as to get described revised
Detailed geological model can represent actual oil reservoir as far as possible.Wherein, the static data can be various geological maps, rock and
Physical properties of fluids data, geological data, log data, rock core and data etc. of appearing；Dynamic data can be well testing, formation testing, examination
Adopt data, injection-production well is monthly/day degree creation data, well history data etc..
S303, according to the revised detailed geological model, determines
The interval of interest of part.
S304, obtains the air permeability and free-boundary problem data of rock core sample in the interval of interest, and generates
Air permeability and the relation curve of free-boundary problem.
S305, determines the air permeability corresponding to catastrophe point in the relation curve, and the catastrophe point is the relation
The maximum point of curve mean curvature.
In above-described embodiment, when the target zone of target reservoir is determined, the detailed geological model for obtaining is corrected,
So that revised detailed geological model can represent actual oil reservoir as far as possible, so as to ensure follow-up according to revised subtly
The sample that matter model determines can more truly reflect oil reservoir practical situation, increase the accuracy of result.
A kind of compact oil reservoir physical property upper limit determining device is additionally provided in the embodiment of the present application, such as the following examples institute
State.Because to a kind of compact oil reservoir physical property upper limit, the principle of the device solve problem determines that method is similar, the therefore reality of the device
The enforcement that may refer to that a kind of compact oil reservoir physical property upper limit determines method is applied, is repeated part and is repeated no more.
With reference to Fig. 4, a kind of compact oil reservoir physical property upper limit determining device that the embodiment of the present application is provided can include：
Reservoir description module 401, for carrying out meticulous pool description to target low-permeability oil deposit, obtains the target hypotonic
The detailed geological model of saturating oil reservoir.
The LOW PERMEABILITY RESERVOIR is often referred in oil reservoir reservoir permeability≤50 × 10-3μm2Between oil reservoir, with permeability
Low, the characteristics of abundance is low, single well productivity is low.
After the meticulous pool description refers to oil field input exploitation, with the intensification and dynamic and static data increasing of recovery percent
Plus, the fine geology properties study for being carried out and remaining oil distribution are described, and the mistake of the geological model of constantly improve reservoir prediction
Journey.The detailed geological model can be a data volume for carrying out geologic description to target reservoir.
Here carry out meticulous pool description to target low-permeability oil deposit may comprise steps of.Wherein, the target is low
Infiltration oil reservoir can be the LOW PERMEABILITY RESERVOIR in region to be studied.
(1) data of the information such as geology, earthquake, well logging and the formation testing pilot production of target low-permeability oil deposit is obtained first.
(2) data in conjunction with information such as the geology, earthquake, well logging and formation testing pilot productions carries out meticulous pool description.
Target zone determining module 402, for according to the detailed geological model, determining the target low-permeability oil deposit fullness in the epigastrium and abdomen
The pre-conditioned interval of interest of foot.
Can embody in the detailed geological model that reservoir description is obtained the overall geologic feature of the target low-permeability oil deposit with
And the details geologic feature of each interval of interest.Wherein, the feature does not singly refer to a certain item specific features, but a lot of features
Set.In one embodiment of the application, this feature can include：The stratum of reservoir, construction, lithology, deposition, heterogeneous body
The feature such as property, reservoir properties, physical properties of fluids.Described meet pre-conditioned can for the purpose of the details geologic feature data of interval with
The overall geologic feature of overall goal low-permeability oil deposit is closest.
In one embodiment of the application, described determine in the target low-permeability oil deposit meet pre-conditioned purpose
Interval, may comprise steps of.
Basis obtains detailed geological model data volume to the oil pool analysis of target LOW PERMEABILITY RESERVOIR first, the number in the data volume
According to the overall geologic feature that can reflect the target reservoir.
Further according to specific interval of interest details geologic feature in detailed geological model, the entirety with the target reservoir is determined
Character numerical value interval of interest position the most close.
Generation module 403 is obtained, for obtaining the air permeability of rock core sample and startup pressure in the interval of interest
The data of gradient, and generate the relation curve of air permeability and free-boundary problem.
In one embodiment of the application, the acquisition generation module specifically includes following submodule.
Sample acquisition module, for obtaining the rock core sample of predetermined number in the interval of interest.
The process for obtaining rock core sample refers to that acquisition is cored and obtains rock core sample.
Data acquisition module, for obtaining the air permeability that the rock core displacement test of each rock core sample is obtained
Data with free-boundary problem.
The rock core sample is carried out rock core displacement test, the air permeability of each rock core sample is obtained and is started pressure
The data of power gradient.
Catastrophe point determining module 404, for determining the air permeability in the relation curve corresponding to catastrophe point, described
Catastrophe point is the maximum point of the relation curve mean curvature.
Sample of the above-described embodiment by LOW PERMEABILITY RESERVOIR to be studied, generation free-boundary problem and air permeability
Core analysis, obtain relation between the two.Further according to compact oil reservoir for general LOW PERMEABILITY RESERVOIR, required startup
The bigger principle of barometric gradient, the air permeability corresponding to the point that free-boundary problem is increased dramatically in choice relation plate are made
For the physical property upper limit of compact oil reservoir, so as to finally determine the physical property upper limit of compact oil reservoir, can provide for subsequent production exploitation
With reference to.
In one embodiment of the application, catastrophe point determining module specifically includes following submodule：
Fitting module, for the relation curve to be fitted, obtains fitting expression；
Determining module, for according to the fitting expression, determining that the air of the relation curve mean curvature maximum oozes
Saturating rate.
Air penetration rate score at above-mentioned maximum curvature is compact oil reservoir physical property upper limit boundary.
In one embodiment of the application, free-boundary problem meets power function relationship with air permeability.According to plan
The power function expression formula for obtaining is closed, the maximum point of calculated curve mean curvature, so that obtain the air permeability corresponding to the point
Numerical value.
Certain relation, and the free-boundary problem value of compact oil reservoir are met according to free-boundary problem and air permeability
Larger, the point that free-boundary problem is undergone mutation by the present embodiment with free-boundary problem value in air permeability curve is that is, bent
The physical property upper limit of the air permeability corresponding to the maximum point of rate as compact oil reservoir.And air permeability is and production practices
A related amount, selects the air permeability physical property upper limit the most provide reference to subsequent development.
In one embodiment of the application, cored when, quantity of coring be no less than 10.In the present embodiment,
Quantity of coring is to ensure that the accuracy when air permeability is drawn with free-boundary problem Core analysis no less than 10.
Data volume is very few in fitting, and error will be than larger, so as to the air permeability higher limit accuracy drop for causing to finally give
Low.
Particular embodiments described above, has been carried out to the purpose of the application, technical scheme and beneficial effect further in detail
Describe bright, the be should be understood that specific embodiment that the foregoing is only the embodiment of the present application in detail, be not used to limit this Shen
Protection domain please, all any modification, equivalent substitution and improvements that within spirit herein and principle, is done etc., all should wrap
It is contained within the protection domain of the application.
Claims (12)
1. a kind of compact oil reservoir physical property upper limit determines method, it is characterised in that comprise the following steps：
Meticulous pool description is carried out to target low-permeability oil deposit, obtains the detailed geological model of the target low-permeability oil deposit；
According to the detailed geological model, determine in the target low-permeability oil deposit and meet pre-conditioned interval of interest；
The data of the air permeability of rock core sample and free-boundary problem in the interval of interest are obtained, and generates air penetration
Rate and the relation curve of free-boundary problem；
Determine the air permeability corresponding to catastrophe point in the relation curve, the catastrophe point is the relation curve mean curvature
Maximum point.
2. the method for claim 1, it is characterised in that the air permeability and free-boundary problem meet power function
Relation.
3. method as claimed in claim 2, it is characterised in that corresponding to the catastrophe point in the determination relation curve
Air permeability, specifically includes：
The relation curve is fitted, fitting expression is obtained；
According to the fitting expression, the air permeability of the relation curve mean curvature maximum is determined.
4. the method for claim 1, it is characterised in that the air of rock core sample oozes in the acquisition interval of interest
Rate and free-boundary problem data, specifically include thoroughly：
Obtain the rock core sample of predetermined number in the interval of interest；
Obtain the data of air permeability that the rock core displacement test of each rock core sample obtains and free-boundary problem.
5. method as claimed in claim 4, it is characterised in that the predetermined number is not less than 10.
6. the method for claim 1, it is characterised in that described according to the detailed geological model, determine the mesh
Before meeting pre-conditioned interval of interest in mark low-permeability oil deposit, also include：
The detailed geological model is modified, revised detailed geological model is obtained；
Corresponding, described according to the detailed geological model, determine in the target low-permeability oil deposit and meet pre-conditioned mesh
Interval, specially：
According to the revised detailed geological model, determine in the target low-permeability oil deposit and meet pre-conditioned target zone
Section.
7. a kind of compact oil reservoir physical property upper limit determining device, it is characterised in that described device includes：
Reservoir description module, for carrying out meticulous pool description to target low-permeability oil deposit, obtains the target low-permeability oil deposit
Detailed geological model；
Target zone determining module, presets for according to the detailed geological model, determining to meet in the target low-permeability oil deposit
The interval of interest of condition；
Generation module is obtained, for obtaining the number of the air permeability of rock core sample and free-boundary problem in the interval of interest
According to, and generate the relation curve of air permeability and free-boundary problem；
Catastrophe point determining module, for determining the air permeability in the relation curve corresponding to catastrophe point, the catastrophe point
For the point that the relation curve mean curvature is maximum.
8. device as claimed in claim 7, it is characterised in that the air permeability and free-boundary problem meet power function
Relation.
9. device as claimed in claim 8, it is characterised in that the catastrophe point determining module is specifically included：
Fitting submodule, for the relation curve to be fitted, obtains fitting expression；
Air permeability determination sub-module, for according to the fitting expression, determining the relation curve mean curvature maximum
Air permeability.
10. device as claimed in claim 7, it is characterised in that the acquisition generation module is specifically included：
Sample acquisition submodule, for obtaining the rock core sample of predetermined number in the interval of interest；
Data acquisition submodule, for obtain air permeability that the rock core displacement test of each rock core sample obtains and
The data of free-boundary problem.
11. devices as claimed in claim 10, it is characterised in that the predetermined number is not less than 10.
12. devices as claimed in claim 7, it is characterised in that also include：
Correcting module, for the detailed geological model that the reservoir description module is obtained to be modified, after being revised
Detailed geological model；
Corresponding, the target zone determining module, for according to the revised detailed geological model, determining that the target is low
Pre-conditioned interval of interest is met in infiltration oil reservoir.
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