Method used for evaluating shale gas adsorption capacity of shale

A technology for mud shale and shale gas, which is applied in the field of evaluation of the ability of mud shale to absorb shale gas, can solve the problems of complex operation and high cost, and achieve the effect of low cost and easy operation

Inactive Publication Date: 2013-11-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Method used for evaluating shale gas adsorption capacity of shale
  • Method used for evaluating shale gas adsorption capacity of shale
  • Method used for evaluating shale gas adsorption capacity of shale

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Embodiment 1

[0017] Embodiment 1: as figure 1 Described, a method for evaluating the ability of shale to absorb shale gas comprises the following steps;

[0018] Step 1: Select 4 samples from the same set of shale reservoirs at different depths for organic carbon content analysis, X-diffraction whole-rock analysis and X-diffraction clay mineral relative content analysis, and determine the shale content per 100g of these 4 samples. Medium organic matter content M 有机质1 , M 有机质2 , M 有机质3 , M 有机质4 2.24g, 6.67g, 6.81g and 8.00g respectively, clay mineral content M 粘土1 , M 粘土2 , M 粘土3 , M 粘土4 Respectively 9.78g, 16.80g, 17.71g and 14.88g, other mineral content M 其它1 , M 其它2 , M 其它3 , M 其它n 87.98g, 76.53g, 75.48g and 77.12g respectively.

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Abstract

The invention discloses a method used for evaluating shale gas adsorption capacity of shale, and belongs to the field of petroleum, geological and mining exploration and development technologies. The method is capable of calculating the shale gas adsorption capacity of shale reservoirs under the formation temperature, and solving a problem that the cost of existing on-site core analysis technology and adsorption isothermal experiment is high. The method comprises following steps: the contents of organic matter, clay mineral and other minerals of samples collected from different depth of a same shale reservoir are determined; adsorption isothermal experiments of the samples are performed so as to determine the Langmuir volumes of the samples under the formation temperature; an equation set is established based on the contents and the Langmuir volumes of the organic matter, the clay mineral and the other minerals of the shale samples so as to determine the shale gas adsorption capacities of the organic matter, the clay mineral and the other minerals under the formation temperature; and the Langmuir volume of a related depth point is calculated based on the contents of the organic matter, the clay mineral and the other minerals of other depth points.

Description

technical field [0001] The invention relates to a method for evaluating the ability of shale to absorb shale gas, and belongs to the technical fields of petroleum, geology, and mining exploration and development. Background technique [0002] Shale gas is the accumulation of natural gas mainly in the formation of mudstone and shale with hydrocarbon generation capacity in the state of adsorption and free. Adsorption is one of the important mechanisms of shale gas occurrence. At present, scholars at home and abroad generally believe that the content of adsorbed gas in shale accounts for at least 40% of the total gas content in shale, and the contribution of adsorbed gas to shale gas resources plays a decisive role. The ability of shale to absorb shale gas directly affects the total gas content of shale reservoirs, and is an important evaluation parameter for calculating shale gas resources and selecting favorable areas. The experimental method for analyzing the ability of sha...

Claims

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Application Information

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IPC IPC(8): G01N7/04
Inventor 陈方文丁雪卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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