Shale in-situ gas-bearing parameter determination method and system based on carbon isotope fractionation

A carbon isotope and parameter determination technology, applied in molecular entity identification, special data processing applications, design optimization/simulation, etc., can solve the problems of lack of quantitative models, staying in qualitative understanding and semi-quantitative analysis, limitations, etc.

Active Publication Date: 2020-12-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on isotope fractionation in the shale gas analysis process mostly stays at the stage of qualitative understanding and semi-quantitative analysis, lack of quantitative models, which greatly limits the application of isotope fractionation in solving the above key problems

Method used

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  • Shale in-situ gas-bearing parameter determination method and system based on carbon isotope fractionation
  • Shale in-situ gas-bearing parameter determination method and system based on carbon isotope fractionation
  • Shale in-situ gas-bearing parameter determination method and system based on carbon isotope fractionation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Such as figure 1 As shown, the present invention provides a method for determining in-situ gas-bearing parameters of shale based on carbon isotope fractionation, the method comprising:

[0075] Step S1: After the core is drilled out of the cylinder, it is sealed in a tank and then analyzed at a constant temperature at the mud circulation temperature.

[0076] Step S2: Continuously and densely collect gas samples at fixed time intervals during the constant temperature analysis process, and continuously record the measured total gas volume and corresponding methane carbon isotope values ​​during the analysis process.

[0077] Step S3: Establish a quantitative model of gas pressure difference seepage in fractures.

[0078] Step S4: Establish a quantitative model of gas flow in the pores of the core matrix during the analysis process.

[0079] Step S5: Determine the diffusion process of kerogen dissolved gas.

[0080] Step S6: Construct the initial conditions and boundar...

Embodiment 2

[0153] Take four shale drilling cores from marine Wufeng Formation-Longmaxi Formation in southern my country as an example:

[0154] Step 1: After cleaning, numbering, and weighing the samples after the core comes out of the barrel, put them in tanks for analysis as soon as possible to shorten the ground exposure time, and set the temperature of the analysis tank in advance as the mud circulation temperature.

[0155] Step 2: Before the analysis of core canning, the system records the key parameters required by the model (see Table 1).

[0156] Table 1 Record table of key parameters of shale core field analysis

[0157]

[0158]

[0159] Step 3: Continuously and intensively collect gas samples during the constant temperature analysis process, record the analysis time, the measured total analysis gas volume and the corresponding methane carbon isotope value during the analysis process (see Table 2).

[0160] Table 2 On-site analytical data of shale cores

[0161]

[...

Embodiment approach

[0175] As an implementation manner, the second quantitative model building module described in the present invention specifically includes:

[0176] The mass balance ratio determining unit is used for determining the mass balance ratio.

[0177] The first ratio determination unit is used to determine 12 CH 4 The ratio of the adsorption rate constant to the desorption rate constant.

[0178] The second ratio determination unit is used to determine 13 CH 4 The ratio of the adsorption rate constant to the desorption rate constant.

[0179] The first quantitative model determining unit is used for determining the mass balance ratio, the 12 CH 4 The ratio of the adsorption rate constant to the desorption rate constant and the 13 CH4 The ratio of the adsorption rate constant to the desorption rate constant was used to establish a quantitative model of the gas flow in the pores of the core matrix during the desorption process.

[0180] As an embodiment, the carbon isotope fra...

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Abstract

The invention provides a shale in-situ gas-bearing parameter determination method and system based on carbon isotope fractionation. A carbon isotope fractionation coupling model in the shale gas analysis process is established according to the quantitative model of crack gas differential pressure seepage, the quantitative model of gas flow in core matrix pores in the analysis process, and the initial conditions and boundary conditions of the kerogen dissolved gas diffusion process and the core analysis process; the shale in-situ gas content and the adsorbed gas / free gas ratio are determined based on the carbon isotope fractionation coupling model, the accuracy, operability and practicability of shale gas resource prediction are improved, and geological application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of shale gas resource detection, in particular to a method and system for determining in-situ gas-containing parameters of shale based on carbon isotope fractionation. Background technique [0002] At present, countries that have achieved commercial development of shale gas include the United States, Canada, and China. Among them, the United States has achieved large-scale commercial production and entered a stage of rapid development of shale gas development. There are 22 shale gas basins in the United States. Marine shale gas is currently the main target of exploration and development, and six basins have been put into commercial development, including Barnett, Fayetteville, Haynesville and Marcellus. Facies Paleozoic Carboniferous, Devonian. About 4,000 wells are drilled in the United States every year, and there are about 45,000 wells currently in production. The breakthrough and industrialized product...

Claims

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Application Information

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IPC IPC(8): G16C20/20G06F30/20
CPCG16C20/20G06F30/20
Inventor 李文镖卢双舫李俊乾张俊魏永波冯文俊宋兆京林子智
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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