CN109190179A - A kind of shale gas preservation condition evaluation method and device - Google Patents
A kind of shale gas preservation condition evaluation method and device Download PDFInfo
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- CN109190179A CN109190179A CN201810895264.6A CN201810895264A CN109190179A CN 109190179 A CN109190179 A CN 109190179A CN 201810895264 A CN201810895264 A CN 201810895264A CN 109190179 A CN109190179 A CN 109190179A
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Abstract
The application provides a kind of shale gas preservation condition evaluation method and device, can not specify influence significance level of each evaluation parameter to shale gas preservation condition in the prior art for solving the problems, such as.This method comprises: obtaining evaluation parameter value of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level in more mouthfuls of shale gas wells；Obtain the weight of each pre-set level of multinomial pre-set level；According to the shale gas preservation condition evaluation equation that the weight of the multinomial pre-set level and each pre-set level of the multinomial pre-set level is constituted, the shale gas preservation condition comprehensive value model value of all objective realities and the division limits value of shale gas preservation condition evaluation criterion are calculated；According to the shale gas preservation condition comprehensive value model value of all objective realities, the shale gas preservation condition comprehensive value model being adapted in regional scope is obtained；Obtain the preservation condition evaluation result of every mouthful of shale gas well in area to be evaluated.
Description
Technical field
This application involves the technical field of shale gas field exploration, it is related to a kind of shale gas preservation condition evaluation method and dress
It sets.
Background technique
Evaluation side of the interior calculation method for calculating short circuit current DC component of industry for the preservation condition of shale gas at present
There are two kinds for method: one is sizing techniques, that is, directly adopt pressure coefficient and save item progress Comprehensive quantitative evaluation to shale gas；It is another
Kind is semiquantitative method: using pressure coefficient sizing technique, qualitative evaluation method is added, for example, by using mature fault situation, sealing strip
The relevant parameters such as part, tectonic style, gas component, formation water salinity and shale Self-Closing are to shale gas preservation condition
Carry out qualitative evaluation.There is can not specify influence weight of each evaluation parameter to shale gas preservation condition for above-mentioned several algorithms
The problem of wanting degree.
Summary of the invention
In view of this, the application provides a kind of shale gas preservation condition evaluation method and device, for solving the prior art
In the problem of can not specifying influence significance level of each evaluation parameter to shale gas preservation condition.
To achieve the above object, the embodiment of the present application provides the following technical solutions:
This application provides a kind of shale gas preservation condition evaluation method, comprising: obtain more mouthfuls of shale gas wells in it is every
The evaluation parameter value of mouthful shale gas well about each pre-set level of multinomial pre-set level, wherein the evaluation parameter value it is big
The small superiority and inferiority degree for showing shale gas preservation condition；By every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial default finger
The evaluation parameter value of each pre-set level of target, obtains the weight of each pre-set level of multinomial pre-set level, wherein the power
Weight is influence degree of each default evaluation parameter to shale gas preservation condition；According to the multinomial pre-set level and described multinomial pre-
If the shale gas preservation condition evaluation equation that the weight of each pre-set level of index is constituted, calculates the shale of all objective realities
The division limits value of gas preservation condition comprehensive value model value and shale gas preservation condition evaluation criterion；According to all objective realities
Shale gas preservation condition comprehensive value model value, obtain the shale gas preservation condition overall merit mark that is adapted in regional scope
It is quasi-；According to the shale gas preservation condition comprehensive value model, the preservation condition for obtaining every mouthful of shale gas well in area to be evaluated is commented
Valence result.
Optionally, in the embodiment of the present application, the every mouthful of shale gas well obtained in more mouthfuls of shale gas wells is about multinomial
The evaluation parameter value of each pre-set level of pre-set level, wherein the size of the evaluation parameter value shows that shale gas saves item
The superiority and inferiority degree of part, comprising: obtain the evaluation parameter value about the first pre-set level in more mouthfuls of shale gas wells, wherein described
The size of evaluation parameter value shows the superiority and inferiority degree of shale gas preservation condition, and the pre-set level is one in multinomial pre-set level
It is a；" obtaining the evaluation parameter value about a pre-set level in more mouthfuls of shale gas wells " step is performed a plurality of times, obtains described every mouthful
Evaluation parameter value of the shale gas well about each pre-set level of the multinomial pre-set level.
Optionally, in the embodiment of the present application, the commenting about the first pre-set level obtained in more mouthfuls of shale gas wells
Valence parameter value, wherein the size of the evaluation parameter value shows the superiority and inferiority degree of shale gas preservation condition, and the pre-set level is
One in multinomial pre-set level, comprising: each pre-set level by every mouthful of shale gas well about the multinomial pre-set level
Evaluation parameter value obtains the first standardization of each pre-set level of multinomial pre-set level according to each evaluation parameter standard assignment
Value；First standardized value of each pre-set level of the multinomial pre-set level is substituted into standardization formula to calculate, is obtained
Second standardized value, the standardization formula is for first standardized value to be transformed into same domain；By described
Two standardized values are as evaluation parameter value of the every mouthful of shale gas well about pre-set level in more mouthfuls of shale gas wells.
Optionally, in the embodiment of the present application, it is described by every mouthful of shale gas well about the multinomial pre-set level each
The evaluation parameter value of pre-set level according to each evaluation parameter standard assignment,
Obtain the first standardized value of each pre-set level of multinomial pre-set level, comprising: by every mouthful of shale gas well
The evaluation parameter value of each pre-set level about the multinomial pre-set level default finger corresponding with the evaluation parameter standard
Target option is compared, and obtains the correspondence option of the correspondence pre-set level of evaluation parameter standard；Joined according to the evaluation
Then the correspondence option of the correspondence pre-set level of number standards obtains the corresponding data of corresponding option；It will be described corresponding optional
The corresponding data of item, the first standardized value of each pre-set level as multinomial pre-set level.
Optionally, in the embodiment of the present application, the first mark of each pre-set level by the multinomial pre-set level
Quasi-ization value substitutes into standardization formula and is calculated, and obtains the second standardized value, comprising: default according to each of multinomial pre-set level
First standardized value of index, screening obtain the maximum value and minimum value of first standardized value；By the multinomial default finger
First standardized value of each pre-set level of target subtracts the minimum value of first standardized value, obtains dividend；It will be described
The maximum value of first standardized value subtracts the minimum value of first standardized value, obtains divisor；By the dividend divided by institute
Divisor is stated, the second standardized value is obtained.
Optionally, in the embodiment of the present application, every mouthful of shale gas well by more mouthfuls of shale gas wells is about multinomial
The evaluation parameter value of each pre-set level of pre-set level, obtains the weight of each pre-set level of multinomial pre-set level, comprising:
According to formulaObtain weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level；
Wherein, σ is weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level, and i is the mark of i-th mouthful of shale gas well
Know, xiFor i-th of evaluation parameter value in more mouthfuls of shale gas wells, μ is the average in more mouthfuls of shale gas wells, and N is more mouthfuls of shale
Number in gas well.
Optionally, in the embodiment of the present application, described according to the multinomial pre-set level and the multinomial pre-set level
The shale gas preservation condition evaluation equation that the weight of each pre-set level is constituted, the shale gas for calculating all objective realities save item
The division limits value of part comprehensive value model value and shale gas preservation condition evaluation criterion, comprising: according to each above-mentioned default finger
The multinomial pre-set level product accumulation is obtained the evaluation of shale gas preservation condition multiplied by each pre-set level value by target weight
Equation；The value of each pre-set level standardization of all objective realities is substituted into evaluation equation and calculates all pages
Rock gas preservation condition comprehensive value model value；It is bent that Cumulative probability is drawn according to the shale gas preservation condition comprehensive value model value
Line changes according to the slope of curve, determines that shale gas preservation condition evaluates type, wherein curve break, that is, slope is changed
Tie point is the division limits value of shale gas preservation condition evaluation criterion.
Optionally, in the embodiment of the present application, described according to the shale gas preservation condition comprehensive value model, obtain to
Evaluate the preservation condition evaluation result of every mouthful of shale gas well in area, comprising: according to the shale gas preservation condition overall merit mark
The evaluation parameter value of every mouthful of shale gas well of block to be evaluated is standardized by standard；Standardized block to be evaluated is every
The evaluation parameter standard value of mouth shale gas well substitutes into shale gas preservation condition evaluation equation, and calculating acquires every mouthful of block to be evaluated
Preservation condition calculated result corresponding to well.
Optionally, in the embodiment of the present application, the evaluation by standardized every mouthful of shale gas well of block to be evaluated is joined
Number standard value substitutes into shale gas preservation condition evaluation equation, and calculating acquires preservation condition corresponding to block each well to be evaluated
Calculated result, comprising: comment the synthesis of block each well preservation condition calculated result to be evaluated and the shale gas preservation condition
Price card standard is compared, and marks off each block preservation condition grade；Using each block preservation condition grade as described in
Preservation condition calculated result.
Present invention also provides a kind of shale gas preservation condition evaluating apparatus, comprising: evaluation parameter value obtains module, is used for
Evaluation parameter value of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level in more mouthfuls of shale gas wells is obtained,
In, the size of the evaluation parameter value shows the superiority and inferiority degree of shale gas preservation condition；Weight obtains module, for passing through more mouthfuls
Evaluation parameter value of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level in shale gas well obtains multinomial pre-
If the weight of each pre-set level of index, wherein the weight is shadow of each default evaluation parameter to shale gas preservation condition
The degree of sound；Evaluation criterion value computing module, for pre- according to each of the multinomial pre-set level and the multinomial pre-set level
If the shale gas preservation condition evaluation equation that the weight of index is constituted, the shale gas preservation condition for calculating all objective realities is comprehensive
Evaluation criterion value；Evaluation criterion obtains module, for the shale gas preservation condition comprehensive value model according to all objective realities
Value obtains the shale gas preservation condition comprehensive value model being adapted in regional scope；Evaluation result obtains module, is used for basis
The shale gas preservation condition comprehensive value model obtains the preservation condition evaluation result of every mouthful of shale gas well in area to be evaluated.
A kind of shale gas preservation condition evaluation method provided by the present application and device, pass through the evaluation parameter collected and obtained
After value is standardized, then with the dispersion degree of each parameter value of average variance method research gassiness evaluation, at it
Reason obtains weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level, calculates the shale of all objective realities
The division limits value of gas preservation condition comprehensive value model value and shale gas preservation condition evaluation criterion；Area is adapted to obtain
Shale gas preservation condition comprehensive value model within the scope of domain；Finally obtain the preservation condition of every mouthful of shale gas well in area to be evaluated
Evaluation result.To efficiently solve the influence weight that can not specify each evaluation parameter in the prior art to shale gas preservation condition
The problem of wanting degree.
To enable the above object and advantages of the application to be clearer and more comprehensible, preferred embodiment is cited below particularly, and appended by cooperation
Attached drawing is described in detail below.
Detailed description of the invention
Illustrate the technical solutions in the embodiments of the present application or in the prior art in order to clearer, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is shale gas preservation condition evaluation method flow chart provided by the present application；
Fig. 2 is shale gas preservation condition evaluation method step S100 flow chart provided by the present application；
Fig. 3 is shale gas preservation condition evaluation method step S110 flow chart provided by the present application；
Fig. 4 is shale gas preservation condition evaluation method step S111 flow chart provided by the present application；
Fig. 5 is shale gas preservation condition evaluation method step S112 flow chart provided by the present application；
Fig. 6 is shale gas preservation condition evaluation method step S300 flow chart provided by the present application；
Fig. 7 is shale gas preservation condition evaluation method step S500 flow chart provided by the present application；
Fig. 8 is shale gas preservation condition evaluation method step S520 flow chart provided by the present application；
Fig. 9 is shale gas preservation condition evaluation result frequency accumulation curve graph provided by the present application；
Figure 10 is the structural schematic diagram of shale gas preservation condition evaluating apparatus provided by the present application.
Icon: 100- shale gas preservation condition evaluating apparatus；10- the first evaluation parameter value obtains module；20- second is evaluated
Parameter value obtains module；The first weight of 30- obtains module；The second weight of 40- obtains module；50- evaluation reference point computing module；
60- evaluation result obtains module.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Ground description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Usually exist
The component of the embodiment of the present application described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed the application's to the detailed description of the embodiments herein provided in the accompanying drawings below
Range, but it is merely representative of the selected embodiment of the application.Based on embodiments herein, those skilled in the art are not being done
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
With reference to the accompanying drawing, it elaborates to some embodiments of the application.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
First embodiment
Referring to Figure 1, Fig. 1 is shale gas preservation condition evaluation method flow chart provided by the present application.It is provided by the present application
A kind of shale gas preservation condition evaluation method, comprising:
Step S100: each the default finger of every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level is obtained
Target evaluation parameter value, wherein the size of the evaluation parameter value shows the superiority and inferiority degree of shale gas preservation condition.
Wherein, it should be noted that, every mouthful of shale gas well in more mouthfuls of shale gas wells is obtained about multinomial pre-set level
The evaluation parameter value of each pre-set level, evaluation parameter value show the degree of shale gas preservation condition characteristic aspect superiority and inferiority；
Step S200: each default finger by every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level
Target evaluation parameter value, obtains the weight of each pre-set level of multinomial pre-set level, wherein the weight is each default evaluation
Influence degree of the parameter to shale gas preservation condition.
Wherein, it should be noted that, by every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level
The evaluation parameter value of each pre-set level, obtains the weight of each pre-set level of multinomial pre-set level, wherein the weight table
The significance level of bright shale gas preservation condition characteristic aspect；Here multinomial pre-set level includes: that parameter mainly includes: buried depth
(material base condition)；Cap rock cumulative thickness and gas-bearing formation contact relation, porosity, pore radius and fracture pressure (roof and floor item
Part)；Tectonic style, stratigraphic dip (construct item away from exceedingly high fracture distance, fault conditions and primary structural elements lifting time
Part)；Reservoir pressure coefficient.
Step S300: according to the weight structure of the multinomial pre-set level and each pre-set level of the multinomial pre-set level
At shale gas preservation condition evaluation equation, calculate the shale gas preservation condition comprehensive value model value and page of all objective realities
The division limits value of rock gas preservation condition evaluation criterion.
Wherein, it should be noted that, the page constituted according to multinomial pre-set level weight corresponding with these indexs
Rock gas preservation condition evaluation equation calculates the evaluation reference point of all objective realities；
Step S400: according to the shale gas preservation condition comprehensive value model value of all objective realities, acquisition is adapted to area
Shale gas preservation condition comprehensive value model within the scope of domain.
Wherein, it should be noted that, the shale constituted according to the multinomial pre-set level and these index respective weights
Gas preservation condition evaluation equation calculates the shale gas preservation condition comprehensive value model value of all objective realities, marks off adaptation
In the shale gas preservation condition evaluation criterion in the regional scope.Then according to the shale gas preservation condition overall merit mark
Standard obtains the preservation condition evaluation result of every mouthful of shale gas well in area to be evaluated.
Step S500: according to the shale gas preservation condition comprehensive value model, every mouthful of shale gas in area to be evaluated is obtained
The preservation condition evaluation result of well.
Wherein, it should be noted that, according to the shale gas preservation condition comprehensive value model, by the condition stub mark
It is quasi- to be compared with the evaluation parameter value, obtain shale gas preservation condition evaluation result.
Fig. 2 is referred to, Fig. 2 is shale gas preservation condition evaluation method step S100 flow chart provided by the present application.It is optional
Ground, in the embodiment of the present application, the every mouthful of shale gas well obtained in more mouthfuls of shale gas wells is about the every of multinomial pre-set level
The evaluation parameter value of item pre-set level, wherein the evaluation parameter value shows the journey of shale gas preservation condition characteristic aspect superiority and inferiority
Degree, comprising:
Step S110: the every mouthful of shale gas well obtained in more mouthfuls of shale gas wells is joined about the evaluation of the first pre-set level
Numerical value, wherein the evaluation parameter value shows the degree of shale gas preservation condition characteristic aspect superiority and inferiority, and the pre-set level is more
One in item pre-set level；
Wherein, it should be noted that, every mouthful of shale gas well in more mouthfuls of shale gas wells is obtained about the first default finger
Target evaluation parameter value, wherein the evaluation parameter value shows the degree of shale gas preservation condition characteristic aspect superiority and inferiority, described pre-
If index is one in multinomial pre-set level；
Step S120: it is performed a plurality of times and " obtains every mouthful of shale gas well commenting about a pre-set level in more mouthfuls of shale gas wells
Valence parameter value " step obtains the evaluation ginseng of each pre-set level of the every mouthful of shale gas well about the multinomial pre-set level
Numerical value.
Wherein, it should be noted that, it is performed a plurality of times that " the every mouthful of shale gas well obtained in more mouthfuls of shale gas wells is default about one
The evaluation parameter value of index " step obtains each pre-set level of every mouthful of shale gas well about the multinomial pre-set level
Evaluation parameter value.
Fig. 3 is referred to, Fig. 3 is shale gas preservation condition evaluation method step S110 flow chart provided by the present application.It is optional
Ground, in the embodiment of the present application, the every mouthful of shale gas well obtained in more mouthfuls of shale gas wells is about the every of multinomial pre-set level
The evaluation parameter value of item pre-set level, wherein the evaluation parameter value shows the journey of shale gas preservation condition characteristic aspect superiority and inferiority
Degree, comprising:
Step S111: the evaluation parameter value by every mouthful of shale gas well about each pre-set level of the multinomial pre-set level
According to each evaluation parameter standard assignment, the first standardized value of each pre-set level of multinomial pre-set level is obtained；
Wherein, it should be noted that, each described evaluation parameter standard is for evaluating shale gas preservation condition feature side
The standard of face superiority and inferiority.
Step S112: the first standardized value of each pre-set level of the multinomial pre-set level is substituted into standardization formula
It is calculated, obtains the second standardized value, the standardization formula is used to first standardized value being transformed into same definition
In domain；
Wherein, it should be noted that, the standardization formula is used to first standardized value being transformed into same definition
In domain.
Step S113: it is preset second standardized value as every mouthful of shale gas well in more mouthfuls of shale gas wells about one
The evaluation parameter value of index.
Wherein, it should be noted that, using second standardized value as every mouthful of shale gas well in more mouthfuls of shale gas wells
Evaluation parameter value about a pre-set level.
Fig. 4 is referred to, Fig. 4 is shale gas preservation condition evaluation method step S111 flow chart provided by the present application.It is optional
Ground, in the embodiment of the present application, the evaluation by every mouthful of shale gas well about each pre-set level of the multinomial pre-set level are joined
Numerical value obtains the first standardized value of each pre-set level of multinomial pre-set level according to each evaluation parameter standard assignment, packet
It includes:
Step S1111: the evaluation by every mouthful of shale gas well about each pre-set level of the multinomial pre-set level
Parameter value is compared with the option of the corresponding pre-set level of the evaluation parameter standard, obtains the correspondence of evaluation parameter standard
The correspondence option of pre-set level；
Wherein, it should be noted that, each by every mouthful of shale gas well about the multinomial pre-set level presets finger
Target evaluation parameter value is compared with the option of the corresponding pre-set level of the evaluation parameter standard, obtains evaluation parameter mark
The correspondence option of quasi- correspondence pre-set level.
Step S1112: it according to the correspondence option of the correspondence pre-set level of the evaluation parameter standard, then obtains corresponding
The corresponding data of option；
Wherein, it should be noted that, according to the correspondence option of the correspondence pre-set level of the evaluation parameter standard, then
Obtain the corresponding data of corresponding option.
Step S1113: by the corresponding data of the corresponding option, each pre-set level as multinomial pre-set level
First standardized value.
Wherein, it should be noted that, by the corresponding data of the corresponding option, each as multinomial pre-set level is pre-
If the first standardized value of index.
Fig. 5 is referred to, Fig. 5 is shale gas preservation condition evaluation method step S112 flow chart provided by the present application.It is optional
First standardized value of each pre-set level of the multinomial pre-set level is substituted into standardization in the embodiment of the present application by ground
Formula is calculated, and the second standardized value is obtained, comprising:
Step S1121: according to the first standardized value of each pre-set level of multinomial pre-set level, screening obtains described the
The maximum value and minimum value of one standardized value；
Wherein, it should be noted that, according to the first standardized value of each pre-set level of multinomial pre-set level, screening is obtained
Obtain the maximum value and minimum value of first standardized value.
Step S1122: the first standardized value of each pre-set level of the multinomial pre-set level is subtracted described first
The minimum value of standardized value obtains dividend；
Wherein, it should be noted that, the first standardized value of each pre-set level of the multinomial pre-set level is subtracted
The minimum value of first standardized value obtains dividend.
The maximum value of first standardized value: being subtracted the minimum value of first standardized value by step S1123, is obtained
Divisor；
Wherein, it should be noted that, the maximum value of first standardized value is subtracted into first standardized value most
Small value obtains divisor.
Step S1124: by the dividend divided by the divisor, the second standardized value is obtained.
Wherein, it should be noted that, by the dividend divided by the divisor, the second standardized value is obtained.
Optionally, in the embodiment of the present application, the first mark of each pre-set level by the multinomial pre-set level
Quasi-ization value substitutes into standardization formula and is calculated, and obtains the second standardized value, comprising:
First standardized value of each pre-set level of the multinomial pre-set level is substituted into standardization formulaIt is calculated, obtains the second standardized value；
Wherein, it should be noted that, S is the second standardized value, and x is the first of each pre-set level of multinomial pre-set level
Standardized value, xminFor the minimum value of the first standardized value, xmaxFor the maximum value of the first standardized value.
Optionally, in the embodiment of the present application, the evaluation parameter value to more mouthfuls of shale gas wells passes through at preset algorithm
Reason obtains weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level, comprising:
According to formulaThe evaluation parameter value of more mouthfuls of shale gas wells is obtained about corresponding default finger
Target weight；
Wherein, it should be noted that, σ is power of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level
Weight, i are the mark of i-th mouthful of shale gas well, xiFor i-th of evaluation parameter value in more mouthfuls of shale gas wells, μ is more mouthfuls of shale gas wells
In average, N is the number in more mouthfuls of shale gas wells.
Fig. 6 is referred to, Fig. 6 is shale gas preservation condition evaluation method step S300 flow chart provided by the present application.It is optional
Ground, in the embodiment of the present application, described each pre-set level according to the multinomial pre-set level and the multinomial pre-set level
Weight constitute shale gas preservation condition evaluation equation, calculate the shale gas preservation condition overall merit mark of all objective realities
The division limits value of quasi- value and shale gas preservation condition evaluation criterion, comprising:
Step S310:, will be described multinomial default according to the weight of each above-mentioned pre-set level multiplied by each pre-set level value
Index product accumulation obtains shale gas preservation condition evaluation equation.
Wherein, it should be noted that, will be described according to the weight of each above-mentioned pre-set level multiplied by each pre-set level value
Multinomial pre-set level product accumulation obtains shale gas preservation condition evaluation equation.
Step S320: the value of each pre-set level standardization of all objective realities is substituted into evaluation equation and is calculated
All shale gas preservation condition comprehensive value model values out.
Wherein, it should be noted that, the value of each pre-set level standardization of all objective realities is substituted into evaluation
All shale gas preservation condition comprehensive value model values are calculated in equation.
Step S330: cumulative relative frequency curve is drawn according to the shale gas preservation condition comprehensive value model value, according to song
Line slope variation determines that shale gas preservation condition evaluates type, and wherein the changed tie point of curve break, that is, slope is
For the division limits value of shale gas preservation condition evaluation criterion.
Wherein, it should be noted that, it is bent that Cumulative probability is drawn according to the shale gas preservation condition comprehensive value model value
Line changes according to the slope of curve, determines that shale gas preservation condition evaluates type, wherein curve break, that is, slope is changed
Tie point is the division limits value of shale gas preservation condition evaluation criterion.
Fig. 7 is referred to, Fig. 7 is shale gas preservation condition evaluation method step S500 flow chart provided by the present application.It is optional
Ground according to the shale gas preservation condition comprehensive value model, obtains every mouthful of shale in area to be evaluated in the embodiment of the present application
The preservation condition evaluation result of gas well, comprising:
Step S510: according to the shale gas preservation condition comprehensive value model, by every mouthful of shale gas well of block to be evaluated
Evaluation parameter value be standardized.
Wherein, it should be noted that, according to the shale gas preservation condition comprehensive value model, by every mouthful of block to be evaluated
The evaluation parameter value of shale gas well is standardized.According to the evaluation reference of every mouthful of shale gas well point, condition stub is obtained
Standard, the condition stub standard show the degree of shale gas preservation condition totality superiority and inferiority.
Step S520: the evaluation parameter standard value of standardized every mouthful of shale gas well of block to be evaluated is substituted into shale gas and is protected
It deposits in condition evaluating equation, calculating acquires preservation condition calculated result corresponding to block each well to be evaluated.
Wherein, it should be noted that, by the evaluation parameter standard value generation of standardized every mouthful of shale gas well of block to be evaluated
Enter in shale gas preservation condition evaluation equation, calculating acquires preservation condition calculated result corresponding to block each well to be evaluated.
Fig. 8 is referred to, Fig. 8 is shale gas preservation condition evaluation method step S520 flow chart provided by the present application.It is optional
The evaluation parameter standard value of standardized every mouthful of shale gas well of block to be evaluated is substituted into shale in the embodiment of the present application by ground
In gas preservation condition evaluation equation, calculating acquires preservation condition calculated result corresponding to block each well to be evaluated, comprising:
Step S521: according to the shale gas preservation condition comprehensive value model, by every mouthful of shale gas well of block to be evaluated
Evaluation parameter value be standardized.
Wherein, it should be noted that, according to the shale gas preservation condition comprehensive value model, by every mouthful of block to be evaluated
The evaluation parameter value of shale gas well is standardized.
Step S522: the evaluation parameter standard value of standardized every mouthful of shale gas well of block to be evaluated is substituted into shale gas and is protected
It deposits in condition evaluating equation, calculating acquires preservation condition calculated result corresponding to block each well to be evaluated.
Wherein, it should be noted that, by the evaluation parameter standard value generation of standardized every mouthful of shale gas well of block to be evaluated
Enter in shale gas preservation condition evaluation equation, calculating acquires preservation condition calculated result corresponding to block each well to be evaluated.
In order to make it easy to understand, the another kind of shale gas preservation condition evaluation method provided by the embodiments of the present application is described below
Application mode, the application mode are specific as follows:
Another application mode of shale gas preservation condition evaluation method provided by the embodiments of the present application is surveyed based on the gas field A
It is practical to visit development and production, in conjunction with shale gas preservation condition analysis of Influential Factors is directed at present both at home and abroad, fully considers that shale is spontaneous
From storage, superior roof and floor condition and stronger self-enclosed property are excellent, and in summary factor preferably goes out target zone buried depth, strata pressure
Coefficient, roof and floor condition and tectonism 12 design parameters of this four major class, seek each parameters weighting by average variance method, build
The evaluation equation of vertical shale preservation condition, by the calculating to the there may be result of evaluation equation, according to the accumulative song of frequency
The slope turning point of line marks off evaluation criterion, to realize the quantitative evaluation of shale gas preservation condition.
Step 1: by thinking to influence page in conjunction with domestic and international research achievement to shale gas preservation condition Analysis The Main Control Factor
The parameter of rock preservation condition mainly includes: buried depth (material base condition)；Cap rock cumulative thickness and gas-bearing formation contact relation, hole
Degree, pore radius and fracture pressure (roof and floor condition)；Tectonic style, stratigraphic dip, away from exceedingly high fracture distance, fault development feelings
Condition and primary structural elements lifting time (structural environment)；Reservoir pressure coefficient.It is saved using this 12 parameters as evaluation shale
The design parameter of condition.
Step 2: based on each shale preservation condition evaluation parameter value of the gas field A, referring to the forefathers such as Lou Zhanghua research at
Fruit makes the standard of each evaluation parameter of shale gas preservation condition, table specific as follows:
Step 3: different parameters dimension is different, to be comparable each parameter, need to mark to each evaluation parameter
Quasi-ization processing, first by each evaluation parameter value of shale preservation condition according to evaluation criterion assignment in step 2, i.e. I class assigns 0.4,
II class assigns 0.3, and III class assigns 0.2, and IV class assigns 0.1；Secondly according to min-max method to 12 parameters of evaluation shale preservation condition
Value is standardized, and standardizes formula such as formula:
Wherein: xminFor minimum value, xmaxFor maximum value, optimal parameter that treated is 1, worst
It is 0.
Step 4: using the dispersion degree of each parameter value of average variance method research gassiness evaluation, so that it is determined that each parameter
The weight of value, specific formula such as following formula:
Wherein: xiFor a number in one group of numerical value, μ is the mean value of this group of number, and N is this
The number of group number.
Obtain shale preservation condition evaluation parameter weight coefficient by average variance method: buried depth K1, cap rock cumulative thickness K2, with
Gas-bearing formation contact relation K3, porosity K4, pore radius K5, fracture pressure K6, tectonic style K7, stratigraphic dip K8, away from exceedingly high disconnected
Split separation is lifted time K11, reservoir pressure coefficient K12 from K9, fault conditions K10, primary structural elements.
Step 5: according to the weighted value for each evaluation parameter that appeal mean square deviation is sought, the evaluation of shale preservation condition is obtained
Calculation formula: P preservation=K1 buried depth+K2 cap rock cumulative thickness+K3 and gas-bearing formation contact relation+K4 porosity+K5 pore radius+
K6 fracture pressure+K7 tectonic style+K8 stratigraphic dip+K9 is away from exceedingly high fracture distance+K10 fault conditions+K11 primary structural elements
It is lifted time+K12 reservoir pressure coefficient.
Step 6: referring to Fig. 9, and Fig. 9 is shale gas preservation condition evaluation result frequency accumulation curve provided by the present application
Figure.Calculate that all there are results according to shale gas preservation condition evaluation equation.Frequency accumulation curve is drawn out according to calculated result,
Specific frequency accumulation curve refers to Fig. 9.
Step 7: knee of curve (curve maximum change point) is the boundary value of shale preservation condition classification, classification thresholds
Are as follows: 0.18 and 0.32.I class shale gas preservation condition: P saves >=0.32；II class shale gas preservation condition: 0.18 < P saves <
0.32；III class shale gas preservation condition: P saves≤0.18.
In order to make it easy to understand, the application that shale gas preservation condition evaluation method provided by the embodiments of the present application is described below is real
Example, the application example are specific as follows:
In the practical application of shale gas well: clear buried depth (material base condition)；Cap rock cumulative thickness contacts pass with gas-bearing formation
System, porosity, pore radius and fracture pressure (roof and floor condition)；Tectonic style, stratigraphic dip, away from exceedingly high fracture distance, disconnected
Split developmental state and primary structural elements lifting time (structural environment)；This 12 parameters of reservoir pressure coefficient are that shale gas saves item
The evaluation parameter of part.
The evaluation ginseng of this corresponding 12 shale gas preservation conditions positioned at the gas field A different configuration position well is counted respectively
Numerical value, table specific as follows:
Referring to each evaluation parameter standard of shale gas preservation condition, upper table is counted positioned at the gas field A different configuration position
The evaluation parameter value of this corresponding 12 shale gas preservation conditions of well carries out one-parameter evaluation, according to evaluation result according to I class
0.4 is assigned, II class assigns 0.3, and III class assigns 0.2, and IV class assigns 0.1 and carries out assignment, as a result it see the table below:
Being standardized according to parameter of the min-max method to preservation condition see the table below:
According to each parameter normalization of upper table the result shows that shale gas preservation condition and buried depth, porosity, fracture pressure, structure
Make pattern, stratigraphic dip, apart from exceedingly high fracture distance and the developmental state in crack this 7 relating to parameters, and it is accumulative with cap rock
Thickness, gas-bearing formation contact relation, pore radius, primary structural elements lifting time and reservoir pressure coefficient correlation are little, in this point
On the basis of analysis, according to variance method, calculating acquires this 7 evaluation parameter weights and is respectively as follows: fault conditions: K10=0.2；Structure
Make pattern: K7=0.17；Buried depth: K1=0.16；Porosity: K4=0.16；Away from exceedingly high tomography distance: K9=0.13；Incline on stratum
Angle: K8=0.09；Fracture pressure: K6=0.08, obtain shale gas preservation condition evaluation calculation formula: P save=0.16 buried depth+
+ 0.09 stratigraphic dip+0.13 of+0.17 tectonic style of+0.08 fracture pressure of 0.16 porosity is broken away from exceedingly high fracture distance+0.2
Developmental state
It is calculated according to shale gas preservation condition evaluation equation all in the presence of as a result, being protected according to the clear shale gas of frequency accumulation curve
Deposit the classification standard of condition, wherein specific frequency accumulation curve feelings are referring to Fig. 9:
Calculation formula, which is evaluated, according to shale gas preservation condition finds out the preservation item positioned at the gas field A different configuration position well respectively
Part value:
Thus prove that the gas field the A region A1, A11, A4 preservation condition is I class, the region A2, A41, A3, B87, B9, A51, D182
Preservation condition is II 1 classes, and the region C6, C7, D190 preservation condition is II 2 classes, and the region C143 preservation condition is III class.
Second embodiment
0, Figure 10 is the structural schematic diagram of shale gas preservation condition evaluating apparatus provided by the present application referring to Figure 1.This Shen
It please additionally provide a kind of shale gas preservation condition evaluating apparatus 100, comprising:
Evaluation parameter value obtains module 10, for obtaining every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial default
The evaluation parameter value of each pre-set level of index, wherein the size of the evaluation parameter value shows shale gas preservation condition
Superiority and inferiority degree；
Weight obtains module 20, for passing through every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level
The evaluation parameter value of each pre-set level, obtains the weight of each pre-set level of multinomial pre-set level, wherein the weight is
Influence degree of each default evaluation parameter to shale gas preservation condition；
Evaluation criterion value computing module 30, for according to each of the multinomial pre-set level and the multinomial pre-set level
The shale gas preservation condition evaluation equation that the weight of pre-set level is constituted, the shale gas preservation condition for calculating all objective realities are comprehensive
Close evaluation criterion value；
Evaluation criterion obtains module 40, for the shale gas preservation condition comprehensive value model according to all objective realities
Value obtains the shale gas preservation condition comprehensive value model being adapted in regional scope；
Evaluation result obtains module 50, for obtaining to be evaluated according to the shale gas preservation condition comprehensive value model
The preservation condition evaluation result of every mouthful of shale gas well in area.
A kind of shale gas preservation condition evaluation method provided by the present application and device, pass through the evaluation parameter collected and obtained
After value is standardized, then with the dispersion degree of each parameter value of average variance method research gassiness evaluation, at it
Reason obtains weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level, calculates the shale of all objective realities
The division limits value of gas preservation condition comprehensive value model value and shale gas preservation condition evaluation criterion；Area is adapted to obtain
Shale gas preservation condition comprehensive value model within the scope of domain；Finally obtain the preservation condition of every mouthful of shale gas well in area to be evaluated
Evaluation result.To efficiently solve the influence weight that can not specify each evaluation parameter in the prior art to shale gas preservation condition
The problem of wanting degree.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
Claims (10)
1. a kind of shale gas preservation condition evaluation method characterized by comprising
Obtain evaluation parameter of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level in more mouthfuls of shale gas wells
Value, wherein the size of the evaluation parameter value shows the superiority and inferiority degree of shale gas preservation condition；
Pass through evaluation parameter of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level in more mouthfuls of shale gas wells
Value, obtains the weight of each pre-set level of multinomial pre-set level, wherein the weight is each default evaluation parameter to shale gas
The influence degree of preservation condition；
It is protected according to the shale gas that the weight of the multinomial pre-set level and each pre-set level of the multinomial pre-set level is constituted
Condition evaluating equation is deposited, the shale gas preservation condition comprehensive value model value and shale gas preservation condition of all objective realities are calculated
The division limits value of evaluation criterion；
According to the shale gas preservation condition comprehensive value model value of all objective realities, the shale being adapted in regional scope is obtained
Gas preservation condition comprehensive value model；
According to the shale gas preservation condition comprehensive value model, the preservation condition for obtaining every mouthful of shale gas well in area to be evaluated is commented
Valence result.
2. shale gas preservation condition evaluation method as described in claim 1, which is characterized in that more mouthfuls of shale gas wells of the acquisition
In evaluation parameter value of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level, wherein the evaluation parameter
The size of value shows the superiority and inferiority degree of shale gas preservation condition, comprising:
Obtain the evaluation parameter value about the first pre-set level in more mouthfuls of shale gas wells, wherein the evaluation parameter value it is big
The small superiority and inferiority degree for showing shale gas preservation condition, first pre-set level are one in multinomial pre-set level；
" obtaining the evaluation parameter value about a pre-set level in more mouthfuls of shale gas wells " step is performed a plurality of times, obtains described every mouthful
Evaluation parameter value of the shale gas well about each pre-set level of the multinomial pre-set level.
3. shale gas preservation condition evaluation method as claimed in claim 2, which is characterized in that more mouthfuls of shale gas wells of the acquisition
In the evaluation parameter value about the first pre-set level, wherein the size of the evaluation parameter value shows shale gas preservation condition
Superiority and inferiority degree, the pre-set level be multinomial pre-set level in one, comprising:
Evaluation parameter value by every mouthful of shale gas well about each pre-set level of the multinomial pre-set level is evaluated according to each
Parameter and standard assignment obtains the first standardized value of each pre-set level of multinomial pre-set level；
First standardized value of each pre-set level of the multinomial pre-set level is substituted into standardization formula to calculate, is obtained
Second standardized value, the standardization formula is for first standardized value to be transformed into same domain；
Using second standardized value as evaluation parameter of the every mouthful of shale gas well about pre-set level in more mouthfuls of shale gas wells
Value.
4. shale gas preservation condition evaluation method as claimed in claim 3, which is characterized in that described to close every mouthful of shale gas well
In the multinomial pre-set level each pre-set level evaluation parameter value according to each evaluation parameter standard assignment, obtain multinomial
First standardized value of each pre-set level of pre-set level, comprising:
Evaluation parameter value and institute's commentary by every mouthful of shale gas well about each pre-set level of the multinomial pre-set level
The option of the correspondence pre-set level of valence parameter and standard is compared, and obtains the correspondence of the correspondence pre-set level of evaluation parameter standard
Option；
According to the correspondence option of the correspondence pre-set level of the evaluation parameter standard, the corresponding number of corresponding option is then obtained
According to；
By the corresponding data of the corresponding option, the first standardized value of each pre-set level as multinomial pre-set level.
5. shale gas preservation condition evaluation method as claimed in claim 3, which is characterized in that described by the multinomial default finger
First standardized value of each pre-set level of target substitutes into standardization formula and is calculated, and obtains the second standardized value, comprising:
According to the first standardized value of each pre-set level of multinomial pre-set level, screening obtains first standardized value most
Big value and minimum value；
First standardized value of each pre-set level of the multinomial pre-set level is subtracted to the minimum of first standardized value
Value obtains dividend；
The maximum value of first standardized value is subtracted to the minimum value of first standardized value, obtains divisor；
By the dividend divided by the divisor, the second standardized value is obtained.
6. shale gas preservation condition evaluation method as described in claim 1, which is characterized in that described to pass through more mouthfuls of shale gas wells
In evaluation parameter value of the every mouthful of shale gas well about each pre-set level of multinomial pre-set level, obtain multinomial pre-set level
The weight of each pre-set level, comprising:
According to formulaThe evaluation parameter value of more mouthfuls of shale gas wells is obtained about corresponding pre-set level
Weight；
Wherein, σ is weight of the evaluation parameter value of more mouthfuls of shale gas wells about corresponding pre-set level, and i is i-th mouthful of shale gas well
Mark, xiFor i-th mouthful of evaluation parameter value in more mouthfuls of shale gas wells, μ is respective items evaluation parameter in more mouthfuls of shale gas wells
Mean value, N are the number of shale gas well.
7. shale gas preservation condition evaluation method as described in claim 1, which is characterized in that described according to described multinomial default
The shale gas preservation condition evaluation equation that the weight of each pre-set level of index and the multinomial pre-set level is constituted calculates institute
There are the shale gas preservation condition comprehensive value model value of objective reality and the division limits value of shale gas preservation condition evaluation criterion,
Include:
According to the weight of each above-mentioned pre-set level multiplied by each pre-set level value, it is by the multinomial pre-set level product accumulation
Obtain shale gas preservation condition evaluation equation；
The value of each pre-set level standardization of all objective realities is substituted into evaluation equation and calculates all shale gas
Preservation condition comprehensive value model value；
Cumulative relative frequency curve is drawn according to the shale gas preservation condition comprehensive value model value, is changed according to the slope of curve, really
Determine shale gas preservation condition evaluation type, wherein the changed tie point of curve break, that is, slope is that shale gas saves item
The division limits value of part evaluation criterion.
8. shale gas preservation condition evaluation method as described in claim 1, which is characterized in that described to be protected according to the shale gas
Condition comprehensive value model is deposited, the preservation condition evaluation result of every mouthful of shale gas well in area to be evaluated is obtained, comprising:
According to the shale gas preservation condition comprehensive value model, by the evaluation parameter value of every mouthful of shale gas well of block to be evaluated into
Row standardization；
The evaluation parameter standard value of standardized every mouthful of shale gas well of block to be evaluated is substituted into shale gas preservation condition evaluation side
Cheng Zhong, calculating acquire preservation condition calculated result corresponding to block each well to be evaluated.
9. shale gas preservation condition evaluation method as claimed in claim 8, which is characterized in that it is described will be standardized to be evaluated
The evaluation parameter standard value of every mouthful of shale gas well of block substitutes into shale gas preservation condition evaluation equation, and calculating acquires area to be evaluated
Preservation condition calculated result corresponding to block each well, comprising:
The comprehensive value model of block each well preservation condition calculated result to be evaluated and the shale gas preservation condition is carried out
It compares, marks off each block preservation condition grade；
Using each block preservation condition grade as the preservation condition calculated result.
10. a kind of shale gas preservation condition evaluating apparatus characterized by comprising
Evaluation parameter value obtains module, for obtaining every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level
The evaluation parameter value of each pre-set level, wherein the size of the evaluation parameter value shows the superiority and inferiority journey of shale gas preservation condition
Degree；
Weight obtains module, for by every mouthful of shale gas well in more mouthfuls of shale gas wells about multinomial pre-set level each is pre-
If the evaluation parameter value of index, obtains the weight of each pre-set level of multinomial pre-set level, wherein the weight is each default
Influence degree of the evaluation parameter to shale gas preservation condition；
Evaluation criterion value computing module, for referring to according to each of the multinomial pre-set level and the multinomial pre-set level are default
The shale gas preservation condition evaluation equation that target weight is constituted, calculates the shale gas preservation condition overall merit of all objective realities
Standard value；
Evaluation criterion obtains module, for the shale gas preservation condition comprehensive value model value according to all objective realities, obtains
The shale gas preservation condition comprehensive value model being adapted in regional scope；
Evaluation result obtains module, for obtaining the every of area to be evaluated according to the shale gas preservation condition comprehensive value model
The preservation condition evaluation result of mouth shale gas well.
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