CN112031740B - Shale gas geological dessert evaluation method and device based on stratum elements - Google Patents
Shale gas geological dessert evaluation method and device based on stratum elements Download PDFInfo
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- CN112031740B CN112031740B CN201910403369.XA CN201910403369A CN112031740B CN 112031740 B CN112031740 B CN 112031740B CN 201910403369 A CN201910403369 A CN 201910403369A CN 112031740 B CN112031740 B CN 112031740B
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- 238000011156 evaluation Methods 0.000 title claims abstract description 77
- 235000021185 dessert Nutrition 0.000 title claims abstract description 39
- 238000003795 desorption Methods 0.000 claims abstract description 39
- 235000011850 desserts Nutrition 0.000 claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 230000000875 corresponding effect Effects 0.000 claims description 6
- 230000002596 correlated effect Effects 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 238000010219 correlation analysis Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 238000012795 verification Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000005553 drilling Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- -1 porosity Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
Abstract
The invention provides a shale gas geological dessert evaluation method based on stratum elements, which comprises the following steps: step one, determining key evaluation parameters for evaluating geological desserts, and extracting stratum element information sensitive to the key evaluation parameters; step two, based on stratum element information, combining a pre-established relation model between sensitive stratum elements and total rock core desorption gas content to obtain total rock core desorption gas content of a region to be evaluated; and thirdly, performing geological dessert evaluation on the region to be evaluated according to the total rock core desorption air content and dessert evaluation criteria of the region to be evaluated to obtain an evaluation result. According to the invention, the element combination relational expression which is jointly sensitive to the key evaluation parameters of the geological dessert is adopted, the relational model between the geological dessert and the rock core desorption gas content is established, the model has higher correlation coefficient, the geological dessert can be accurately evaluated, and the defects of lack of data, high cost, difficulty in verification and the like are overcome.
Description
Technical Field
The invention relates to the technical field of petroleum engineering, in particular to a shale gas geological dessert evaluation method and device based on stratum elements.
Background
Shale gas geological desserts refer to regions of shale gas that are relatively enriched, and evaluation parameters include porosity, permeability, total organic carbon, kerogen type and content, clay mineral type and content, specular reflectivity (thermal maturity), effective thickness, free and adsorbed gas content, pore pressure, rock density, and the like.
The problems of the prior art are mainly two aspects: firstly, the evaluation is difficult. The parameters are mainly obtained by core data of the pilot well, and the defects are obvious: the drilling coring and analysis cost is high; (2) Shale has stronger heterogeneity, the data of the pilot well cannot accurately represent the quality of a horizontal section, and the horizontal well does not core, and the logging data is little or even not logging; (3) Because shale is a nanoscale pore, pore penetration data of the shale is difficult to measure, and deviation of evaluation conclusion of geological desserts can be caused; (4) The horizontal well adopts oil-based drilling fluid, and the data such as total organic carbon of rock cuttings and the like are greatly influenced, so that rock thermal logging is not performed. Secondly, verification is difficult, only one total data is used for yield test of the horizontal segment, and accuracy of geological dessert segmentation evaluation is difficult to verify.
Therefore, the invention provides a shale gas geological dessert evaluation method and device based on stratum elements.
Disclosure of Invention
In order to solve the problems, the invention provides a shale gas geological dessert evaluation method based on stratum elements, which comprises the following steps:
step one, determining key evaluation parameters for evaluating geological desserts, and extracting stratum element information sensitive to the key evaluation parameters;
step two, based on the stratum element information, combining a pre-established relation model between sensitive stratum elements and the total gas content of core desorption to obtain the total gas content of core desorption of the region to be evaluated;
and thirdly, performing geological dessert evaluation on the region to be evaluated according to the total rock core desorption air content and dessert evaluation criteria of the region to be evaluated to obtain an evaluation result.
According to one embodiment of the present invention, the first step specifically includes the following steps:
performing depth matching on geological data of areas to be evaluated of different data sources;
carrying out correlation analysis on sensitive stratum elements corresponding to each key evaluation parameter to obtain a correlation coefficient and correlation;
and sorting from high to low according to the correlation coefficient to obtain a key evaluation parameter sensitive element list.
According to one embodiment of the invention, a data source comprises: laboratory analysis data, logging data, and elemental logging data.
According to one embodiment of the invention, the method further comprises: and obtaining positive correlation sensitive stratum elements and negative correlation sensitive stratum elements corresponding to each key evaluation parameter.
According to an embodiment of the present invention, the step two specifically includes the following steps:
selecting a positive correlation sensitive stratum element group and a negative correlation sensitive stratum element group which are sensitive to key evaluation parameters together;
calculating to obtain a first ratio and/or a second ratio according to the positive correlation sensitive stratum element group and the negative correlation sensitive stratum element group;
and calculating to obtain the total gas content of the core desorption of the region to be evaluated according to the relation model.
According to one embodiment of the invention, the first ratio and/or the second ratio is calculated by the following formula:
wherein E is r Represents the first ratio, E pi Representing the content of positively correlated sensitive stratum elements, E nj Representing the content of elements of the negatively related sensitive stratum, E r ' represents the second ratio.
According to one embodiment of the invention, the relationship model contains the following formula:
wherein C is g And (3) representing the total gas content of the core desorption, wherein a represents a first fitting parameter, and b represents a second fitting parameter.
According to an embodiment of the present invention, the third step specifically includes the following steps:
when the total gas content of core desorption of the region to be evaluated is less than 1m 3 T is greater than or equal to 1m 3 T is less than 2m 3 T is greater than or equal to 2m 3 At/t, the grade of the geological dessert of the region to be evaluated is respectively class III, class II and class I.
According to one embodiment of the invention, the key evaluation parameters include porosity, total organic carbon, total hydrocarbons, and rock density.
According to another aspect of the present invention, there is also provided a shale gas geological dessert evaluation device based on stratum elements, the device comprising:
a first module for determining key evaluation parameters for evaluating geological desserts and extracting stratum element information sensitive to the key evaluation parameters;
the second module is used for obtaining the total gas content of the core desorption of the region to be evaluated by combining a pre-established relation model between sensitive stratum elements and the total gas content of the core desorption based on the stratum element information;
and the third module is used for evaluating the geological dessert of the region to be evaluated according to the total rock core desorption gas content and the dessert evaluation standard of the region to be evaluated to obtain an evaluation result.
According to the shale gas geological dessert evaluation method and device based on stratum elements, the element combination relation formula which is sensitive to key evaluation parameters of geological desserts is adopted, the relation model between the shale gas geological desserts and the rock core desorption gas content is established, the model has high correlation coefficient, the geological desserts (because the core of the geological desserts is high in gas content) can be accurately evaluated, various defects of lack of data, high cost, difficulty in verification and the like are overcome, element logging data with low cost and wide application range can be adopted, the operation is simpler, the cost is lower, and the judgment is more accurate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 shows a flow chart of a shale gas geological dessert evaluation method based on stratum elements according to an embodiment of the invention;
FIG. 2 shows a flow chart of a method for evaluating shale gas geological desserts based on stratum elements to obtain a list of key evaluation parameter sensitive elements according to one embodiment of the invention;
FIG. 3 shows a flow chart of obtaining core desorption total gas content of a region to be evaluated in a shale gas geological dessert evaluation method based on stratum elements according to an embodiment of the invention;
FIG. 4 shows a plot of the drop points of the regional data points to be evaluated in a shale gas geological dessert evaluation process according to one embodiment of the present invention; and
fig. 5 shows a block diagram of a shale gas geological dessert evaluation device based on stratum elements according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 shows a flow chart of a shale gas geological dessert evaluation method based on stratum elements according to an embodiment of the invention.
As shown in fig. 1, in step S101, key evaluation parameters for evaluating geological desserts are determined, and formation element information sensitive to the key evaluation parameters is extracted.
In one embodiment, the list of key evaluation parameter sensitive elements may be obtained by a method as shown in FIG. 2. As shown in fig. 2, in step S201, geological data of regions to be evaluated of different data sources are depth-matched.
Specifically, the data sources include: laboratory analysis data, logging data, and elemental logging data.
Then, in step S201, correlation analysis is performed on the sensitive stratum elements corresponding to each key evaluation parameter, so as to obtain a correlation coefficient R and correlation.
Specifically, positive correlation sensitive stratum elements and negative correlation sensitive stratum elements corresponding to each key evaluation parameter are obtained.
Finally, in step S202, sorting from high to low is performed according to the correlation coefficient, so as to obtain a list of sensitive elements of the key evaluation parameters.
Referring to fig. 1, in step S102, based on formation element information, a pre-established relationship model between sensitive formation elements and total core desorption gas content is combined to obtain total core desorption gas content of a region to be evaluated.
In one embodiment, the total core desorption gas content of the region to be evaluated may be obtained by a method as shown in fig. 3. As shown in fig. 3, in step S301, a positive correlation sensitive formation element group and a negative correlation sensitive formation element group that are commonly sensitive to the key evaluation parameter are selected.
Specifically, 2-3 positively correlated sensitive stratum elements which are jointly sensitive to the key evaluation parameters and 2-3 negatively correlated sensitive stratum elements which are jointly sensitive to the key evaluation parameters can be selected.
Then, in step S302, a first ratio and/or a second ratio are calculated according to the positive correlation sensitive formation element group and the negative correlation sensitive formation element group.
Specifically, the first ratio and/or the second ratio are calculated by the following formula:
wherein E is r Represents a first ratio, E pi Representing the content of positively correlated sensitive stratum elements, E nj Representing the content of elements of the negatively related sensitive stratum, E r ' represents a second ratio.
Finally, in step S303, according to the relationship model, the total core desorption air content of the region to be evaluated is calculated.
Specifically, the relationship model contains the following formula:
wherein C is g The total gas content of core desorption is represented by a, a represents a first fitting parameter, and b represents a second fitting parameter.
Finally, as shown in fig. 1, in step S103, the geological dessert is evaluated for the region to be evaluated according to the total core desorption gas content and the dessert evaluation criteria of the region to be evaluated, so as to obtain an evaluation result.
Specifically, when the total gas content of core desorption of the region to be evaluated is less than 1m 3 T is greater than or equal to 1m 3 T is less than 2m 3 T is greater than or equal to 2m 3 At/t, the grade of the geological dessert of the region to be evaluated is respectively class III, class II and class I.
Preferably, the key evaluation parameters include porosity, total organic carbon, total hydrocarbons, and rock density.
The method shown in the figure 1 overcomes the technical problems that in the prior art, shale gas wells, especially shale gas horizontal wells, have few core data and logging data, and are difficult to accurately evaluate and verify geological desserts, adopts element combination relation formulas which are sensitive to parameters such as porosity, total organic carbon, total hydrocarbon, rock density and the like, establishes a relation model between the element combination relation formulas and the desorption gas content of the core, and achieves the aim of accurately evaluating the geological desserts.
In one embodiment, continuous drilling and coring are performed on an X-well pilot well, and laboratory analysis, logging and in-situ gas content desorption data are complete. After depth unification of the data, by performing sensitive element analysis (as in table 1) on total organic carbon, total hydrocarbon, porosity, and rock density, it can be seen that the commonly sensitive positive correlation element is P, S and the negatively correlation element is K, al.
For this purpose, a relationship between (p+s)/(k+al) and the total gas content of core desorption was established, and it can be seen that the correlation coefficient between the two reached 0.84. According to the related national standard and industry standard<1m 3 /t、≥1m 3 /t～＜2m 3 /t、≥2m 3 As evaluation criteria for geological desserts iii, ii, i, it can be seen that 4 out of 41 data points do not match (as shown in fig. 4), in fig. 4, Y represents total gas content (core desorption total gas content), R represents correlation coefficient, a (first fitting parameter) takes a value of 0.0812, and b (second fitting parameter) takes a value of 5.6542. The coincidence rate reaches more than 90 percent.
TABLE 1X sensitive stratigraphic element analysis for key evaluation parameters of geological dessert
In table 1, S, K, fe, P, ca, al represents sulfur element, potassium element, iron element, phosphorus element, calcium element, and aluminum element, respectively. + represents positive correlation, -represents negative correlation.
Fig. 5 shows a block diagram of a shale gas geological dessert evaluation device based on stratum elements according to an embodiment of the present invention. As shown in fig. 5, the evaluation device 500 includes a first module 501, a second module 502, and a third module 503.
The first module 501 is configured to determine key evaluation parameters for evaluating geological desserts, and extract formation element information sensitive to the key evaluation parameters.
The second module 502 is configured to obtain a total core desorption gas content of the region to be evaluated based on formation element information and in combination with a pre-established relationship model between sensitive formation elements and total core desorption gas content.
And a third module 503 is configured to perform geological dessert evaluation on the region to be evaluated according to the total core desorption gas content and the dessert evaluation criteria of the region to be evaluated, so as to obtain an evaluation result.
In summary, the shale gas geological dessert evaluation method and device based on stratum elements, provided by the invention, adopt element combination relation formula which is sensitive to key evaluation parameters of geological desserts together, build a relation model between the shale gas geological desserts and the rock core desorption gas content, and the model has higher correlation coefficient, can accurately evaluate the geological desserts (because the core of the geological desserts is provided with higher gas content), overcomes various defects of lack of data, high cost, difficult verification and the like, can adopt element logging data with low cost and wide application, and is simpler to operate, lower in cost and more accurate in judgment.
It is to be understood that the disclosed embodiments are not limited to the specific structures, process steps, or materials disclosed herein, but are intended to extend to equivalents of these features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention are disclosed above, the embodiments are only used for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.
Claims (5)
1. A shale gas geological dessert evaluation method based on stratum elements, which is characterized by comprising the following steps:
step one, determining key evaluation parameters for evaluating geological desserts, and extracting stratum element information sensitive to the key evaluation parameters;
step two, based on the stratum element information, combining a pre-established relation model between sensitive stratum elements and the total gas content of core desorption to obtain the total gas content of core desorption of the region to be evaluated;
thirdly, performing geological dessert evaluation on the region to be evaluated according to the total rock core desorption air content and dessert evaluation criteria of the region to be evaluated to obtain an evaluation result;
the first step specifically comprises the following steps: performing depth matching on geological data of areas to be evaluated of different data sources; carrying out correlation analysis on sensitive stratum elements corresponding to each key evaluation parameter to obtain a correlation coefficient and correlation; according to the correlation coefficient, sorting from high to low is carried out, and a key evaluation parameter sensitive element list is obtained;
the method further comprises: obtaining positive correlation sensitive stratum elements and negative correlation sensitive stratum elements corresponding to each key evaluation parameter;
the second step specifically comprises the following steps: selecting a positive correlation sensitive stratum element group and a negative correlation sensitive stratum element group which are sensitive to key evaluation parameters together; calculating to obtain a first ratio and/or a second ratio according to the positive correlation sensitive stratum element group and the negative correlation sensitive stratum element group; according to the relation model, calculating to obtain the total gas content of core desorption of the region to be evaluated;
the first ratio and/or the second ratio is calculated by the following formula:
wherein E is r Represents the first ratio, E pi Representing the content of positively correlated sensitive stratum elements, E nj Representing the content of elements of the negatively related sensitive stratum, E r ' represents the second ratio;
the relationship model contains the following formula:
wherein C is g Representing the total air content of the core desorption, a represents a first fitting parameter, b representsAnd a second fitting parameter.
2. The method of claim 1, wherein the data source comprises: laboratory analysis data, logging data, and elemental logging data.
3. The method according to claim 1, wherein the third step comprises the steps of:
when the total gas content of core desorption of the region to be evaluated is less than 1m 3 T is greater than or equal to 1m 3 T is less than 2m 3 T is greater than or equal to 2m 3 At/t, the grade of the geological dessert of the region to be evaluated is respectively class III, class II and class I.
4. A method according to any one of claims 1-3, wherein the key evaluation parameters comprise porosity, total organic carbon, total hydrocarbons, rock density.
5. A shale gas geological dessert evaluation device based on stratum elements, characterized in that it performs the method according to any one of claims 1-4, said device comprising:
a first module for determining key evaluation parameters for evaluating geological desserts and extracting stratum element information sensitive to the key evaluation parameters;
the second module is used for obtaining the total gas content of the core desorption of the region to be evaluated by combining a pre-established relation model between sensitive stratum elements and the total gas content of the core desorption based on the stratum element information;
and the third module is used for evaluating the geological dessert of the region to be evaluated according to the total rock core desorption gas content and the dessert evaluation standard of the region to be evaluated to obtain an evaluation result.
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