CN111622751B - 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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- CN111622751B CN111622751B CN202010504219.0A CN202010504219A CN111622751B CN 111622751 B CN111622751 B CN 111622751B CN 202010504219 A CN202010504219 A CN 202010504219A CN 111622751 B CN111622751 B CN 111622751B
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- 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
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- 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
- 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
Abstract
The invention discloses a shale gas dessert evaluation method based on a gas carbon isotope, which comprises the following steps: acquiring gas carbon isotope composition data while drilling; collecting geological logging data; drawing gas carbon isotope composition data and geological logging data into a comprehensive sectional view; and combining with geological parameters, and dividing the dessert intervals according to the composition parameters of the gas carbon isotopes. Through the mode, the method disclosed by the invention can be implemented after the well completion of the vertical well, 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 drilling logging technology and rock experimental test analysis. Based on experimental test analysis and research, main parameters for evaluating shale gas desserts of the Tongmaxi group in the southern China comprise total organic carbon, brittle mineral content, porosity and formation pressure. Shale gas desserts are classified according to the indexes of high total organic carbon value, high gas content, high porosity, high formation pressure, and bedding development, and natural microcrack development (namely 'four-high two-development'). The corresponding logging sequences are natural gamma, acoustic time difference, resistivity and density logging technologies, and shale gas display intervals are divided according to the characteristics of high natural gamma, high time difference, high resistivity and low density (namely 'three high and one low'). And determining shale gas dessert intervals by combining the gas-bearing layer interval division of the logging.
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 a tight sandstone reservoir dual dessert based on a three-dimensional geological model of geological exploration data and well logging data. Whether experimental tests or well logging analysis belong to post-drilling evaluation technologies, are composed of a series of evaluation parameters, and not only are a great deal of manpower and financial resources spent, but also the time is long (the exploration progress is delayed). More importantly, the above technique ignores the geological information that shale gas itself contains.
Disclosure of Invention
The invention mainly solves the technical problem of providing a shale gas dessert evaluation method based on a gas carbon isotope, which is mainly used for rapidly identifying shale gas dessert intervals and accelerating 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 gas carbon isotope composition data and geological logging data into a comprehensive sectional view;
and combining with geological parameters, and dividing the dessert intervals according to the composition parameters of the gas carbon isotopes.
In a preferred embodiment of the invention, the while-drilling gas carbon isotope composition data is derived from mud gas and cuttings tank top gas.
In a preferred embodiment of the present invention, the data of the slurry gas is carbon isotope composition data of the slurry gas component.
In a preferred embodiment of the invention, the mud gas composition comprises methane, ethane, and propane.
In a preferred embodiment of the invention, the data of the rock chip tank top gas is carbon isotope composition data of different time rock chip tank top gas components.
In a preferred embodiment of the invention, the cuttings tank top gas component comprises methane, ethane and propane.
In a preferred embodiment of the present invention, the geological logging data includes formation stratification data, depth data, lithology change data, gas logging data and gamma logging while drilling data.
In a preferred embodiment of the present invention, the integrated profile is a parallel plot of geological logging data and gas carbon isotope composition data in terms of longitudinal changes in depth.
In a preferred embodiment of the invention, the geologic parameters include formation lithology characteristics, gas measurements, shale effective thickness.
In a preferred embodiment of the present invention, the gas carbon isotope composition parameter comprises a slurry gas methane and ethane carbon isotope difference; the difference between methane and propane carbon isotopes in the slurry gas; the isotopic difference of ethane and propane in slurry gas; the difference between methane and carbon isotopes of the slurry gas and the rock fragment tank top gas; the difference value of the ethane carbon isotopes of the slurry gas and the rock debris tank top gas; the difference between the propane carbon isotope of the slurry gas and the rock fragment tank top gas; methane carbon isotope difference of the top gas of the rock debris tank; the difference of the gas-ethane-carbon isotopes at the top of the rock debris tank; and (3) a rock debris tank top gas propane carbon isotope difference value.
The beneficial effects of the invention are as follows: according to the shale gas dessert evaluation method based on the gas carbon isotopes, the geological information stored in the shale gas is focused, the shale gas dessert interval is identified by using the shale gas carbon isotope detection technology while drilling, the exploration cost is greatly reduced, the dessert evaluation period is greatly shortened, and the exploration efficiency is improved.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of a gas carbon isotope while drilling test flow in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic and simplified illustration of the gas carbon isotope while drilling detection flow described in FIG. 1;
FIG. 3 is a comprehensive cross-sectional view of a shale gas well in accordance with a preferred embodiment of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Taking a shale gas well of a Yingma stream group in the eastern region of a Sichuan basin as an example, the implementation process of the shale gas dessert evaluation method based on the gas carbon isotopes is specifically described, 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 are from two parts of mud gas and rock debris tank top gas. The mud gas is the gas released by the circulation of drilling mud into a mud separator tank located at the surface. 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 loading the rock debris sample from the slurry separating tank into an analyzing tank, extracting the rock debris tank top gas sample according to different time, injecting the rock debris sample into a separation oxidation device, and then introducing a carbon isotope spectrometer to measure the carbon isotope ratio. Fig. 1 clearly depicts the detection flow of the carbon isotope of the well site gas while drilling, and fig. 2 is a corresponding simplified diagram.
The data of the slurry gas is carbon isotope composition data of a slurry gas component, wherein the slurry gas component comprises methane, ethane and propane and further comprises other alkane gas components. The data of the rock chip tank top gas are obtained by collecting rock chip samples with different depths while drilling, and carbon isotope composition data of rock chip tank top gas components at different times are detected, wherein the rock chip tank top gas components comprise methane, ethane and propane and further comprise 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 relevant geological logging data according to specific conditions.
(3) Drawing a comprehensive section view
By LogBox ® The professional mapping software maps the collected geological logging data and the gas carbon isotope composition data acquired while drilling into a comprehensive cross-sectional view, as shown in fig. 3.
The comprehensive section view comprises all geological logging data and gas carbon isotope composition data, and all the data are drawn in parallel according to longitudinal changes of depth.
(4) Partitioning dessert intervals
And dividing shale gas dessert intervals by the carbon isotope composition parameters of each alkane gas component of the slurry gas and the rock fragment tank top gas. The alkane gas component carbon isotope composition parameters comprehensively reflect the reservoir pressure characteristics, the permeability and the gas content, and can directly reflect the advantages and disadvantages of the shale gas layer. And combining geological parameters, overlapping the isotope composition parameters, determining that the dessert interval of the mouth shale gas drilling well is 3786-3817 m, wherein the dessert interval has the characteristics of overpressure of stratum, relative maximum permeability and relative maximum gas content, and the shaded part of figure 3 shows dessert evaluation results, and the parameters of gamma, lithology, total organic carbon content and brittle mineral content are well corresponding.
Wherein the geological parameters include formation lithology characteristics, gas measurements, shale effective thickness, and may also include other relevant geological parameters. The gas carbon isotope composition parameters comprise the difference value of slurry gas methane and ethane carbon isotopes; the difference between methane and propane carbon isotopes in the slurry gas; the isotopic difference of ethane and propane in slurry gas; the difference between methane and carbon isotopes of the slurry gas and the rock fragment tank top gas; the difference value of the ethane carbon isotopes of the slurry gas and the rock debris tank top gas; the difference between the propane carbon isotope of the slurry gas and the rock fragment tank top gas; methane carbon isotope difference of the top gas of the rock debris tank; the difference of the gas-ethane-carbon isotopes at the top of the rock debris tank; and (3) a rock debris tank top gas propane carbon isotope difference value.
The invention adopts the carbon isotope logging technology to obtain the carbon isotope composition data of the formation mud gas and the rock chip tank top gas, and the shale gas dessert interval is divided by the carbon isotope composition parameters of each of the mud gas and the rock chip tank top gas and by combining geological parameters such as the effective thickness of the organic shale, so as to provide guidance for horizontal well drilling. Compared with the traditional method, the method disclosed by the invention can be implemented after the well completion of the vertical well, so that the dessert evaluation period is effectively shortened, and the oil and gas exploration efficiency is improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (8)
1. The shale gas dessert evaluation method based on the gas carbon isotope is characterized by comprising the following steps of: acquiring gas carbon isotope composition data while drilling; collecting geological logging data; drawing gas carbon isotope composition data and geological logging data into a comprehensive sectional view; dividing dessert intervals according to gas carbon isotope composition parameters by combining geological parameters;
the geological logging data comprises stratum layering data, depth data, lithology change data, gas logging data and gamma logging while drilling data, and the comprehensive section view is formed by drawing the geological logging data and gas carbon isotope composition data in parallel according to the longitudinal change of the depth.
2. The method of claim 1, wherein the while drilling acquisition of gas carbon isotope composition data is from a mud gas and a cuttings top gas.
3. The method for evaluating shale gas desserts based on gaseous carbon isotopes of claim 2, wherein the data of the mud gas is carbon isotope composition data of the mud gas component.
4. A method of evaluating a shale gas dessert based on gaseous carbon isotopes of claim 3, wherein the mud gas composition comprises methane, ethane and propane.
5. The method for evaluating shale gas desserts based on gaseous carbon isotopes of claim 2, wherein the data of the cuttings dome gas is carbon isotope composition data of different time cuttings dome gas components.
6. The method of evaluating a shale gas dessert based on gaseous carbon isotopes of claim 5, wherein the cuttings tank top gas components comprise methane, ethane and propane.
7. The method for evaluating shale gas desserts based on gaseous carbon isotopes of claim 1, wherein the geological parameters include formation lithology characteristics, gas measurements, shale effective thickness.
8. The method of claim 1, wherein the gas carbon isotope composition parameters include a slurry gas methane and ethane carbon isotope difference; the difference between methane and propane carbon isotopes in the slurry gas; the isotopic difference of ethane and propane in slurry gas; the difference between methane and carbon isotopes of the slurry gas and the rock fragment tank top gas; the difference value of the ethane carbon isotopes of the slurry gas and the rock debris tank top gas; the difference between the propane carbon isotope of the slurry gas and the rock fragment tank top gas; methane carbon isotope difference of the top gas of the rock debris tank; the difference of the gas-ethane-carbon isotopes at the top of the rock debris tank; and (3) a rock debris tank top gas propane carbon isotope difference value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| 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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