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Method for evaluating shale reservoir stratum occurrence gas absorption quantity

A mud shale and occurrence technology, applied in the direction of analyzing materials, instruments, etc., can solve the problems of complicated operation and high cost, and achieve the effect of low cost and easy operation.

Active Publication Date: 2017-07-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Overcome the disadvantages of existing technologies and methods, which are complicated to operate and expensive

Method used

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  • Method for evaluating shale reservoir stratum occurrence gas absorption quantity
  • Method for evaluating shale reservoir stratum occurrence gas absorption quantity
  • Method for evaluating shale reservoir stratum occurrence gas absorption quantity

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Embodiment 1

[0015] Example 1: Such as figure 1 Said, a method for evaluating the amount of adsorbed gas stored in a shale reservoir includes the following steps:

[0016] Step 1: Analyze organic matter, illite, Imonite, montmorillonite, chlorite, kaolinite, quartz, feldspar, calcite, and shale samples per unit mass by multi-scale argon ion polishing-scanning electron microscopy imaging method Dolomite and pyrite cover the inner surface area of ​​pores with different pore diameters S Organic matter i , S Imon mixed layer i , S Montmorillonite i , S Chlorite i , S Kaolinite i , S Quartz i , S Feldspar i , S Calcite i , S Dolomite i , S Pyrite i , The unit of the inner surface area of ​​the pores with different pore diameters covered by various components is nm 2 / g, i=1, 2, 3,..., n, is the number of the aperture, a dimensionless parameter, in this embodiment n=8, and the results of the analysis are shown in Table 1.

[0017] Table 1

[0018]

[0019] Step 2: Use molecular simulation te...

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Abstract

A method for evaluating shale reservoir stratum occurrence gas absorption quantity belongs to the technical field of petroleum exploration and development. The method can evaluate the shale reservoir stratum occurrence gas absorption quantity at different temperatures and pressures, so that the problem the cost for an on-site core analysis and isothermal adsorption experiment is high is overcome. The method comprises the following steps: 1) analyzing the component covered area of holes having different diameters in a shale sample per unit mass through a multiscale argon ion polishing and scanning electron microscope imagining method; 2) establishing a series of single-hole models of inner surfaces of holes which are covered with components and having different diameters through molecular simulation; 3) calculating the thickness and density of adsorbed-state methane located at the inner surfaces of mineral single-hole models in different temperature and pressures through molecular simulation; and 4) according to the component covered area of holes having different diameters and the thickness and density of adsorbed-state methane located at the inner surfaces of mineral single-hole models in different temperature and pressures in the shale sample, calculating the shale reservoir stratum occurrence gas absorption quantity at corresponding temperature and pressure.

Description

Technical field [0001] The invention relates to a method for evaluating the amount of adsorbed gas in a shale reservoir, and belongs to the technical field of petroleum exploration and development. Background technique [0002] Shale gas is the main body of natural gas accumulation in shale and shale with the ability to generate hydrocarbons in an adsorbed and free state. Adsorption is one of the important mechanisms for the occurrence of shale gas. At present, scholars at home and abroad generally believe that the content of adsorbed gas in mud shale accounts for at least 40% of the total gas content of shale, and the contribution of adsorbed gas to shale gas resources plays an important role. The amount of shale adsorbed shale gas directly affects the gas content of shale reservoirs. It is an important evaluation parameter for calculating shale gas resources, optimizing favorable areas, and formulating shale gas well development plans. The experimental method of analyzing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 陈方文丁雪卢双舫薛海涛李吉君王民王伟明黄文彪肖佃师
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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