CN111622751A - Shale gas dessert evaluation method based on gas carbon isotopes - Google Patents
Shale gas dessert evaluation method based on gas carbon isotopes Download PDFInfo
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- CN111622751A CN111622751A CN202010504219.0A CN202010504219A CN111622751A CN 111622751 A CN111622751 A CN 111622751A CN 202010504219 A CN202010504219 A CN 202010504219A CN 111622751 A CN111622751 A CN 111622751A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 69
- 238000011156 evaluation Methods 0.000 title claims abstract description 25
- 235000021185 dessert Nutrition 0.000 title claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 30
- 239000011435 rock Substances 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 19
- 239000001294 propane Substances 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 9
- YNIXPIABGHKZPS-UHFFFAOYSA-N [C].CC Chemical compound [C].CC YNIXPIABGHKZPS-UHFFFAOYSA-N 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- GMACPFCYCYJHOC-UHFFFAOYSA-N [C].C Chemical compound [C].C GMACPFCYCYJHOC-UHFFFAOYSA-N 0.000 claims description 3
- CBIIVSNVIRRJAS-UHFFFAOYSA-N [C].CCC Chemical compound [C].CCC CBIIVSNVIRRJAS-UHFFFAOYSA-N 0.000 claims description 3
- 238000013517 stratification Methods 0.000 claims description 2
- 238000013507 mapping Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 110
- 238000005516 engineering process Methods 0.000 description 10
- 235000009508 confectionery Nutrition 0.000 description 9
- 150000001335 aliphatic alkanes Chemical class 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 235000011850 desserts Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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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
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a shale gas dessert evaluation method based on gas carbon isotopes, which comprises the following steps: acquiring gas carbon isotope composition data while drilling; collecting geological logging data; drawing the gas carbon isotope composition data and geological logging data into a comprehensive profile; combining geological parameters, and dividing the sweet-spot intervals according to the gas carbon isotope composition parameters. Through the mode, the method disclosed by the invention can be implemented after the vertical well is completed, so that the dessert evaluation period is effectively shortened, and the oil and gas exploration efficiency is improved.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a shale gas dessert evaluation method based on gas carbon isotopes.
Background
Currently, shale gas dessert evaluation research is mainly based on data of two aspects of well drilling and logging technology and rock experiment test analysis. Based on experimental test analysis research, the main parameters of shale gas desserts evaluation in Longmaxi group of south China, the south-segmented Xianzhi System, comprise total organic carbon, brittle mineral content, porosity and formation pressure. The shale gas dessert is divided according to indexes of high total organic carbon value, high gas content, high porosity, high formation pressure, bedding development and natural microcrack development (namely 'four high two development'). The logging sequence corresponding to the natural gamma logging method is a natural gamma logging technology, a sonic time difference logging technology, a resistivity logging technology and a density logging technology, and shale gas display layer sections are divided according to the characteristics of high natural gamma, high time difference logging, high resistivity logging and low density (namely three high and one low). And determining the shale gas sweet-spot interval by combining the logging gas-containing interval division.
CN 109063232A discloses a shale gas well reservoir dessert evaluation method based on logging data. CN 108661630A discloses a shale gas geological dessert quantitative evaluation method based on experiment and logging parameter optimization. CN 109102180A discloses a method for evaluating dual desserts of tight sandstone reservoir based on a three-dimensional geological model of geological exploration data and logging data. Whether experimental test or well logging analysis belongs to evaluation technology after drilling, and the evaluation technology is composed of a series of evaluation parameters, thereby not only spending a large amount of manpower and financial resources, but also being long in time (delaying exploration progress). More importantly, the technology ignores geological information contained in the shale gas.
Disclosure of Invention
The invention mainly solves the technical problem of providing a shale gas sweet spot evaluation method based on gas carbon isotopes, which is mainly used for quickly identifying shale gas sweet spot intervals and accelerating the shale gas exploration process.
In order to solve the technical problems, the invention adopts a technical scheme that: the shale gas dessert evaluation method based on the gas carbon isotopes comprises the following steps:
acquiring gas carbon isotope composition data while drilling;
collecting geological logging data;
drawing the gas carbon isotope composition data and geological logging data into a comprehensive profile;
combining geological parameters, and dividing the sweet-spot intervals according to the gas carbon isotope composition parameters.
In a preferred embodiment of the invention, the gas carbon isotope composition while drilling data is obtained from mud gas and debris canister gas.
In a preferred embodiment of the present invention, the mud gas data is carbon isotope composition data of the components of the mud gas.
In a preferred embodiment of the invention, the components of the slurry gas include methane, ethane and propane.
In a preferred embodiment of the invention, the data of the formation cuttings top gas is carbon isotope composition data of formation cuttings top gas components at different times.
In a preferred embodiment of the invention, the cuttings overhead gas component comprises methane, ethane and propane.
In a preferred embodiment of the invention, the geological logging data comprises formation stratification data, depth data, lithology change data, gas logging data and gamma-ray logging while drilling data.
In a preferred embodiment of the invention, the integrated profile maps are constructed by juxtaposing geological logging data and gas carbon isotope composition data as a function of longitudinal depth changes.
In a preferred embodiment of the invention, the geological parameters include formation lithology characteristics, gas logging values, and shale effective thickness.
In a preferred embodiment of the present invention, the gas carbon isotope composition parameter includes a difference between methane and ethane carbon isotopes in the slurry gas; difference between methane isotope and propane carbon isotope in slurry gas; difference between carbon isotopes of ethane and propane in slurry gas; the difference of the carbon isotopes of methane in the mud gas and the top gas of the rock debris tank; difference of ethane carbon isotope between mud gas and top gas of rock debris tank; the difference between the carbon isotopes of propane in the slurry gas and the top gas of the rock debris tank; the difference of the methane carbon isotopes of the top gas of the rock debris tank; ethane carbon isotope difference of the top gas of the rock debris tank; and (4) the difference of the carbon isotopes of propane in the top gas of the rock debris tank.
The invention has the beneficial effects that: according to the shale gas sweet spot evaluation method based on the gas carbon isotope, geological information contained in shale gas is focused, and the shale gas sweet spot interval is identified by using the while-drilling shale gas carbon isotope detection technology, so that the exploration cost is greatly reduced, the sweet spot evaluation period is greatly shortened, and the exploration efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic view illustrating a process of detecting carbon isotopes while drilling in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a gas carbon isotope while-drilling detection process shown in FIG. 1;
FIG. 3 is a composite cross-sectional view of a shale gas well in accordance with a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Taking a Longmaxi shale gas well in the east of the Sichuan basin as an example, the implementation process of the shale gas dessert evaluation method based on the gas carbon isotopes is specifically explained, and the method specifically comprises the following steps.
(1) Acquiring gas carbon isotope composition data while drilling
The gas carbon isotope composition data obtained while drilling come from two parts of mud gas and rock debris tank top gas. The mud gas is the gas released by the circulation of the drilling mud into a mud knock-out tank located on the ground. The released slurry gas is directly connected with a front-end separation oxidation device, and then is introduced into a carbon isotope spectrometer to measure the isotope ratio. And (3) filling the rock debris sample from the slurry separation tank into an analysis tank, extracting the rock debris tank top gas sample according to different time, injecting the rock debris tank top gas sample into a separation oxidation device, and then introducing a carbon isotope spectrometer to measure the carbon isotope ratio. FIG. 1 clearly depicts a well site gas carbon isotope while drilling detection process, and FIG. 2 is a corresponding diagram.
The data of the slurry gas are carbon isotope composition data of components of the slurry gas, and the components of the slurry gas comprise methane, ethane and propane and also comprise other alkane gas components. The data of the rock debris tank top gas are used for collecting rock debris samples with different depths while drilling and detecting carbon isotope composition data of rock debris tank top gas components at different times, wherein the rock debris tank top gas components comprise methane, ethane and propane and other alkane gas components.
(2) Collecting geological logging data
The geological logging data comprises stratum layering data, depth data, lithology change data and gas logging data, and can also comprise gamma logging while drilling data and other related geological logging data according to specific conditions.
(3) Drawing a comprehensive section view
By using LogBox®And (3) drawing the collected geological logging data and the gas carbon isotope composition data obtained while drilling into a comprehensive profile by the professional drawing software, wherein the comprehensive profile is shown in a figure 3.
The comprehensive profile comprises all geological logging data and gas carbon isotope composition data, and all data are drawn in parallel according to the longitudinal change of depth.
(4) Partitioning sweet spot segments
And dividing the shale gas sweet-spot layer section through the carbon isotope composition parameters of each alkane gas component of the mud gas and the detritus tank top gas. The carbon isotope composition parameters of the alkane gas components comprehensively reflect the pressure characteristics, permeability and gas content of the reservoir, and can directly reflect the advantages and disadvantages of the shale gas layer. Combining geological parameters, superposing the isotope composition parameters, and determining that the sweet spot interval of the shale gas drilling well is 3786-3817 meters, wherein the sweet spot interval has the characteristics of stratum overpressure, relatively maximum permeability and relatively maximum gas content, and the hatched part in fig. 3 shows the sweet spot evaluation result, which has good correspondence with the parameters of gamma, lithology, total organic carbon content and brittle mineral content.
The geological parameters comprise formation lithology characteristics, gas logging values, shale effective thickness and other related geological parameters. The gas carbon isotope composition parameters comprise a difference value of methane and ethane carbon isotopes in the slurry gas; difference between methane isotope and propane carbon isotope in slurry gas; difference between carbon isotopes of ethane and propane in slurry gas; the difference of the carbon isotopes of methane in the mud gas and the top gas of the rock debris tank; difference of ethane carbon isotope between mud gas and top gas of rock debris tank; the difference between the carbon isotopes of propane in the slurry gas and the top gas of the rock debris tank; the difference of the methane carbon isotopes of the top gas of the rock debris tank; ethane carbon isotope difference of the top gas of the rock debris tank; and (4) the difference of the carbon isotopes of propane in the top gas of the rock debris tank.
According to the method, the carbon isotope composition data of the alkane gas of the formation mud gas and the detritus tank top gas are obtained by adopting a carbon isotope logging technology, and shale gas dessert intervals are divided by combining the carbon isotope composition parameters of the alkane gas components of the mud gas and the detritus tank top gas and the geological parameters such as the effective thickness of organic shale, so that guidance is provided for drilling of a horizontal well. Compared with the traditional method, the method disclosed by the invention can be implemented after the vertical well is completed, so that the dessert evaluation period is effectively shortened, and the oil and gas exploration efficiency is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A shale gas dessert evaluation method based on gas carbon isotopes is characterized by comprising the following steps:
acquiring gas carbon isotope composition data while drilling;
collecting geological logging data;
drawing the gas carbon isotope composition data and geological logging data into a comprehensive profile;
combining geological parameters, and dividing the sweet-spot intervals according to the gas carbon isotope composition parameters.
2. The method for gaseous carbon isotope-based shale gas dessert evaluation of claim 1, wherein the gas carbon isotope composition while drilling data is obtained from mud gas and cuttings tank top gas.
3. The method for gaseous carbon isotope-based shale gas dessert evaluation of claim 2, wherein said slurry gas data is carbon isotope composition data of slurry gas components.
4. The gaseous carbon isotope-based shale gas dessert evaluation method of claim 3, wherein said mud gas components include methane, ethane, and propane.
5. The gaseous carbon isotope-based shale gas dessert evaluation method of claim 2, wherein the cuttings top gas data is carbon isotope composition data of cuttings top gas components at different times.
6. The gaseous carbon isotope-based shale gas dessert evaluation method of claim 5, wherein said detritus canister top gas components include methane, ethane, and propane.
7. The method of evaluating a shale gas dessert based on gaseous carbon isotopes of claim 1, wherein the geological logging data includes formation stratification data, depth data, lithology change data, gas logging data, and gamma logging while drilling data.
8. The method of claim 1, wherein the synthetic profile is a parallel mapping of geological logging data and gas carbon isotope composition data as a function of longitudinal depth change.
9. The method of claim 1, wherein the geological parameters include formation lithology characteristics, gas log values, shale effective thickness.
10. The shale gas dessert evaluation method based on gaseous carbon isotopes of claim 1, wherein the gaseous carbon isotope composition parameters include a difference in methane and ethane carbon isotopes of the mud gas; difference between methane isotope and propane carbon isotope in slurry gas; difference between carbon isotopes of ethane and propane in slurry gas; the difference of the carbon isotopes of methane in the mud gas and the top gas of the rock debris tank; difference of ethane carbon isotope between mud gas and top gas of rock debris tank; the difference between the carbon isotopes of propane in the slurry gas and the top gas of the rock debris tank; the difference of the methane carbon isotopes of the top gas of the rock debris tank; ethane carbon isotope difference of the top gas of the rock debris tank; and (4) the difference of the carbon isotopes of propane in the top gas of the rock debris tank.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113756790A (en) * | 2021-09-07 | 2021-12-07 | 西安石油大学 | Novel multi-section productivity evaluation method for oil and gas well |
| CN113803062A (en) * | 2021-10-20 | 2021-12-17 | 中国石油化工股份有限公司 | Method for determining continental facies shale horizon attribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20180016896A1 (en) * | 2016-07-15 | 2018-01-18 | Geoisochem Corporation | Assessing Permeability |
| CN107766654A (en) * | 2017-10-23 | 2018-03-06 | 西南石油大学 | A kind of method that shale gas reserve capacity is calculated based on capturing oil-gas in stages principle |
| CN110795513A (en) * | 2018-07-17 | 2020-02-14 | 中国石油天然气股份有限公司 | Method for predicting distribution of river facies source storage ectopic type compact oil gas dessert area |
| CN110940613A (en) * | 2019-11-05 | 2020-03-31 | 苏州冠德能源科技有限公司 | Simulation experiment device for carbon isotope analysis in shale gas release process |
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2020
- 2020-06-05 CN CN202010504219.0A patent/CN111622751B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180016896A1 (en) * | 2016-07-15 | 2018-01-18 | Geoisochem Corporation | Assessing Permeability |
| CN107766654A (en) * | 2017-10-23 | 2018-03-06 | 西南石油大学 | A kind of method that shale gas reserve capacity is calculated based on capturing oil-gas in stages principle |
| CN110795513A (en) * | 2018-07-17 | 2020-02-14 | 中国石油天然气股份有限公司 | Method for predicting distribution of river facies source storage ectopic type compact oil gas dessert area |
| CN110940613A (en) * | 2019-11-05 | 2020-03-31 | 苏州冠德能源科技有限公司 | Simulation experiment device for carbon isotope analysis in shale gas release process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113756790A (en) * | 2021-09-07 | 2021-12-07 | 西安石油大学 | Novel multi-section productivity evaluation method for oil and gas well |
| CN113756790B (en) * | 2021-09-07 | 2023-10-03 | 西安石油大学 | Multi-section productivity evaluation method for oil and gas well |
| CN113803062A (en) * | 2021-10-20 | 2021-12-17 | 中国石油化工股份有限公司 | Method for determining continental facies shale horizon attribution |
| CN113803062B (en) * | 2021-10-20 | 2024-02-20 | 中国石油化工股份有限公司 | Method for determining land mud shale horizon attribution |
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