CN108561126A - A kind of simple and easy method of determining shale gas reservoir organic porosity - Google Patents
A kind of simple and easy method of determining shale gas reservoir organic porosity Download PDFInfo
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- CN108561126A CN108561126A CN201810205298.8A CN201810205298A CN108561126A CN 108561126 A CN108561126 A CN 108561126A CN 201810205298 A CN201810205298 A CN 201810205298A CN 108561126 A CN108561126 A CN 108561126A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 8
- 101100435119 Arabidopsis thaliana APRR1 gene Proteins 0.000 claims description 7
- 101100481792 Schizosaccharomyces pombe (strain 972 / ATCC 24843) toc1 gene Proteins 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 4
- 238000004422 calculation algorithm Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 11
- 230000004308 accommodation Effects 0.000 abstract description 3
- 238000000205 computational method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000000611 regression analysis Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- Fluid Mechanics (AREA)
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- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The present invention relates to a kind of simple and easy methods of determining shale gas reservoir organic porosity, obtain the bulk density ρ b data of the well shale gas reservoir, obtain the total content of organic carbon TOC data of the well shale gas reservoir, determine shale gas reservoir organic porosity scale conversion coefficient K, bulk density ρ b according to shale gas reservoir, total content of organic carbon TOC and organic porosity scale conversion coefficient K, the shale gas reservoir organic porosity PORtoc of the well is calculated with PORtoc=K (TOC/ ρ b), exports result of calculation.Simple and easy to do, accommodation of the invention is compared with wide, cost is relatively low.The present invention applies more than 80 mouth wells in Fuling shale gas field, the result obtained with other methods is close, mean error is no more than 10%, can meet the need of work of live Fast Evaluation shale gas reservoir, can provide important references for shale gas exploration constituency and Reserves Evaluation.
Description
Technical field
Application field of the present invention is shale gas exploration and development, is specifically related to a kind of determining shale gas reservoir organic porosity
Simple and easy method, for scene Fast Evaluation shale gas reservoir key parameter is provided.
Background technology
In the evaluation of shale gas fine reservoir interpretation, shale gas reservoir porosity is typically divided into inorganic porosity and organic
Hole.The size of shale gas reservoir organic porosity is to evaluate an important indicator of shale quality, to the object of shale gas reservoir
Property, gas-bearing property and aerogenesis evaluation play a crucial role.
Recognized by retrieving pertinent literature, patent, shale gas reservoir organic porosity is sought depending at present
The core experiment room of dedicated unit is analyzed, and the shale gas reservoir organic porosity for being based partially on well-log information determines that method operates phase
To complexity, the information content needed is larger, higher to personnel qualifications, is not suitable for scene and quickly determines the organic hole of shale gas reservoir
The demand of porosity, therefore there is an urgent need to a kind of quick, simple and easy to do and more accurately and reliably method, carried for live Fast Evaluation
For shale gas reservoir organic porosity.
CN104794351A the disclosure of the invention a kind of computational methods and device of the total organic porosity of shale gas reservoir, method
Be according to the relation derivation of quality-volume-density-content of organic matter, it is always organic to solve shale gas reservoir in the prior art
Porosity cannot detect acquisition, also the not no calculation formula of standard.The invention can be in total organic porosity meter of shale gas reservoir
It calculates and shale gas Reserves Evaluation aspect has important application value.Such method not only needs dedicated unit, of high cost, and
Computational methods are relative complex, are not suitable for the live total organic porosity of quick obtaining shale gas reservoir.
A kind of shale gas reservoir organic porosity based on well-log information of CN106223941A disclosure of the invention determines method,
Its core be calculate pending well shale gas reservoir regard maturity of organic matter Roa, regard shale gas reservoir organic porosity φ
Toca, the result of calculation of the pending well shale gas reservoir organic porosity φ toc of final output.The method that the invention provides is page
The evaluation of rock gas reservoir can provide reliable data, but calculate Roa and need data more, and need to carry out at the standardization of these data
Reason, it is relatively large in situ of drilling well application difficulty, and cannot determine the organic hole of shale gas reservoir with boring in drilling process
Degree.
Invention content
The purpose of the present invention is be directed to above-mentioned present situation, it is desirable to provide one kind is simple and easy to do, accommodation is wider, at low cost
Compared with the simple and easy method of shale gas reservoir organic porosity can be quickly determined at the scene.
The realization method of the object of the invention is the simple and easy method for determining shale gas reservoir organic porosity, and specific steps are such as
Under：
1) the bulk density ρ b data of the well shale gas reservoir, measurement unit g/cm are obtained3；
2) the total content of organic carbon TOC data of the well shale gas reservoir are obtained, measurement unit is mass percent, uses %
It indicates；
3) shale gas reservoir organic porosity scale conversion coefficient K, dimensionless are determined；
4) the shale gas reservoir that bulk density ρ b of the shale gas reservoir obtained according to step 1), step 2) are obtained
The organic porosity scale conversion coefficient K that total content of organic carbon TOC and step 3) are obtained calculates the shale gas reservoir of the well
Organic porosity PORtoc, computation model are PORtoc=K (TOC/ ρ b), measurement unit %；
5) final calculation result is exported.
Incidence relation between the data that the present invention is obtained according to shale core analysis of experiments, and well logging is surveyed by scene and is answered
With practical proof, can be determined to solve the problems, such as that shale gas reservoir organic porosity scene is quick.
Simple and easy to do, accommodation of the invention is compared with wide, cost is relatively low.The present invention applies more than 80 mouths in Fuling shale gas field
Well, the result obtained with other methods is close, and mean error is no more than 10%, can meet live Fast Evaluation shale gas reservoir
Need of work can provide important references for shale gas exploration constituency and Reserves Evaluation.
Description of the drawings
Fig. 1 is workflow block diagram of the present invention；
Fig. 2 is real work flow detail drawing of the present invention；
Fig. 3 is the regression analysis figure that shale gas reservoir organic porosity scale conversion coefficient is sought.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings.
Referring to Fig.1,2, it is of the invention the specific steps are：
1) the bulk density ρ b data of the well shale gas reservoir are obtained
The data source of the bulk density ρ b of shale gas reservoir preferentially selects core analysis data, WELL LITHOLOGY density successively
DEN data, well logging shale density measure data, the present invention are considered as the bulk density ρ b and WELL LITHOLOGY density of shale gas reservoir
DEN numerical value is suitable, and the measurement unit of ρ b is g/cm3；
When selecting WELL LITHOLOGY density DEN data, well logging shale density measure data, depth interval is no more than 1m.
2) the total content of organic carbon TOC data of the well shale gas reservoir are obtained, the measurement unit of TOC is %；
The data source of total content of organic carbon TOC preferentially selects core analysis data, well logging shale density measure number successively
According to, well logging calculate data；
Total content of organic carbon TOC well logging computation models recommend TOC=A (B-DEN), are there is 6 groups or more of rock core point
When analysing data, it can be returned with least square method and determine that model coefficient A, B and coefficient R, R should be greater than 0.75；
J block Longma small stream group marine facies shale model coefficients A, B take A=20, B=respectively for Sichuan southeast
2.71。
Total content of organic carbon TOC errors corresponding with the depth of bulk density ρ b of shale gas reservoir are no more than 0.5m.
3) it determines shale gas reservoir organic porosity scale conversion coefficient K (see Fig. 2), comprises the concrete steps that：
(1) the shale gas reservoir organic porosity POR1toc that core hole core experiment analysis obtains in work area is obtained；
(2) total content of organic carbon TOC1, bulk density ρ b1 that the core experiment analysis of corresponding depth point obtains are obtained, it is deep
The corresponding error of degree is no more than 0.5m, and when sampling step length is less than 0.5m, depth corresponds to error and is no more than 1 sampling step length；
The ratio (TOC1/ ρ b1) of node-by-node algorithm total content of organic carbon TOC1 divided by bulk density ρ b1；
(3) it utilizes least square method to return and determines shale gas reservoir organic porosity scale conversion coefficient K, coefficient R
It should be greater than 0.75.
The present invention is used for Fuling shale gas field, and 158 groups of core experiment analysis sample datas return, and determine K=0.51 (see figure
3), coefficient R=0.91；
Practical experience shows that K=0.51 (being approximately equal to 0.5) can be used as default value, utilize model POR1toc=K
(TOC1/ ρ b1) calculates work area shale gas reservoir organic porosity；
When the well work area core experiment analysis sample number is more than or equal to 6, it can be returned with least square method and determine K.
4) according to above-mentioned obtained bulk density ρ b, total content of organic carbon TOC and organic porosity scale conversion coefficient K
Data calculate shale gas reservoir the organic porosity PORtoc, measurement unit %, computation model PORtoc=of the well
K·(TOC/ρb)；
5) result of calculation is exported
(1) the calculating data of the well shale gas reservoir organic porosity are exported point by point by depth correspondence；
(2) maximum value, minimum value, arithmetic mean of instantaneous value of interval output shale gas reservoir organic porosity are pressed；
(3) it is index with depth, is exported by graphical format, curve graph includes shale gas reservoir organic porosity
PORtoc, total content of organic carbon TOC, bulk density ρ b or WELL LITHOLOGY density DEN, including but not limited to above-mentioned project.
The present invention solve the calculating of the shale gas reservoir organic porosity needed for live Fast Evaluation shale gas reservoir with
Determine problem, method is simple, applied widely, at low cost, and a kind of innovative technology is provided for shale gas exploration and development.
Claims (7)
1. a kind of simple and easy method of determining shale gas reservoir organic porosity, it is characterised in that：It is as follows：
1) the bulk density ρ b data of the well shale gas reservoir, measurement unit g/cm are obtained3；
2) the total content of organic carbon TOC data of the well shale gas reservoir are obtained, measurement unit is mass percent, with % tables
Show；
3) shale gas reservoir organic porosity scale conversion coefficient K, dimensionless are determined；
4) the shale gas reservoir that bulk density ρ b of the shale gas reservoir obtained according to step 1), step 2) are obtained always has
The shale gas reservoir that the organic porosity scale conversion coefficient K that machine carbon content TOC and step 3) are obtained calculates the well is organic
Porosity PORtoc, computation model are PORtoc=K (TOC/ ρ b), measurement unit %；
5) final calculation result is exported.
2. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1, it is characterised in that：Step
It is rapid 1) in the data source of bulk density ρ b of shale gas reservoir select core analysis data, WELL LITHOLOGY density DEN numbers successively
According to, well logging shale density measure data；The bulk density ρ b of shale gas reservoir are suitable with WELL LITHOLOGY density DEN numerical value.
3. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1 or 2, feature exist
In：Depth interval is no more than 1m when selecting WELL LITHOLOGY density DEN data, well logging shale density measure data in step 1).
4. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1, it is characterised in that：Step
It is rapid 2) in total content of organic carbon TOC well logging computation model use TOC=A (B-DEN), having 6 groups or more of core analysis data
When, it is returned with least square method and determines model coefficient A, B.
5. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1 or 4, feature exist
In：Total content of organic carbon TOC errors corresponding with the depth of bulk density ρ b of shale gas reservoir are no more than 0.5m.
6. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1, it is characterised in that：Step
It is rapid 3) in determine shale gas reservoir organic porosity scale conversion coefficient K the specific steps are：
1) the shale gas reservoir organic porosity POR1toc that core hole core experiment analysis obtains in work area is obtained；
2) total content of organic carbon TOC1, bulk density ρ b1 that the core experiment analysis of corresponding depth point obtains are obtained, depth corresponds to
Error is no more than 0.5m, and when sampling step length is less than 0.5m, depth corresponds to error and is no more than 1 sampling step length；
The ratio (TOC1/ ρ b1) of node-by-node algorithm total content of organic carbon TOC1 divided by bulk density ρ b1；
3) it utilizes least square method to return and determines shale gas reservoir organic porosity scale conversion coefficient K.
7. a kind of simple and easy method of determining shale gas reservoir organic porosity according to claim 1, it is characterised in that：Step
Rapid 5) output result is as follows：
1) the calculating data of the well shale gas reservoir organic porosity are exported point by point by depth correspondence；
2) maximum value, minimum value, arithmetic mean of instantaneous value of interval output shale gas reservoir organic porosity are pressed；
3) it is index with depth, is exported by graphical format, curve graph includes shale gas reservoir organic porosity PORtoc, always has
Machine carbon content TOC, bulk density ρ b or WELL LITHOLOGY density DEN.
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Cited By (5)
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| CN110717249A (en) * | 2019-09-16 | 2020-01-21 | 中国石油大学(北京) | A method and system for rapid prediction of shale gas reservoir logging porosity |
| CN111122408A (en) * | 2019-12-23 | 2020-05-08 | 中国地质大学（武汉） | Method for estimating organic porosity of shale with pore diameter of 0.3-10nm |
| CN111537390A (en) * | 2020-06-11 | 2020-08-14 | 中国石油大学(华东) | A method for evaluating the increase in the organic porosity of the reservoir during the heating and modification of shale oil production |
| CN113139877A (en) * | 2020-01-17 | 2021-07-20 | 中国石油天然气股份有限公司 | Shale gas well screening method and device |
| CN116066064A (en) * | 2021-12-16 | 2023-05-05 | 中国石油天然气集团有限公司 | Method for calculating shale gas reservoir porosity by using element logging |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110717249A (en) * | 2019-09-16 | 2020-01-21 | 中国石油大学(北京) | A method and system for rapid prediction of shale gas reservoir logging porosity |
| CN111122408A (en) * | 2019-12-23 | 2020-05-08 | 中国地质大学（武汉） | Method for estimating organic porosity of shale with pore diameter of 0.3-10nm |
| CN113139877A (en) * | 2020-01-17 | 2021-07-20 | 中国石油天然气股份有限公司 | Shale gas well screening method and device |
| CN113139877B (en) * | 2020-01-17 | 2024-03-26 | 中国石油天然气股份有限公司 | Shale gas well screening method and device |
| CN111537390A (en) * | 2020-06-11 | 2020-08-14 | 中国石油大学(华东) | A method for evaluating the increase in the organic porosity of the reservoir during the heating and modification of shale oil production |
| CN116066064A (en) * | 2021-12-16 | 2023-05-05 | 中国石油天然气集团有限公司 | Method for calculating shale gas reservoir porosity by using element logging |
| CN116066064B (en) * | 2021-12-16 | 2023-12-19 | 中国石油天然气集团有限公司 | Method for calculating shale gas reservoir porosity by using element logging |
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