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Method for Determination of Shale Adsorbed Gas Capacity

A measurement method and a technology of adsorbed gas, applied in the direction of analyzing materials and instruments, etc., can solve the problems of poor accuracy of results, neglect of the volume space of adsorbed gas, etc.

Inactive Publication Date: 2018-12-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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Problems solved by technology

However, in this process, the measured excess adsorption amount is often taken as the absolute adsorption amount of shale, ignoring the volume space occupied by the adsorbed gas, resulting in poor accuracy of the results

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0025] Based on these embodiments, those of ordinary skill in the art can still perform equivalent transformations on some or all of the technical features without any creative work; All equivalent technical solutions belong to the protection scope of the present invention, and for the sake of brevity in this specification, there is no need to describe them one by one.

[0026] It should be noted that, in the description of the present invention, the terms "first" and "second" are only used for convenience of description, and should not be interpret...

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Abstract

The invention provides a method for determining the gas absorption quantity of shale, and relates to an unconventional oil and gas exploration and development technology. The method for determining the gas absorption quantity of the shale comprises the steps of acquiring excess absorption quantities under different test pressures by carrying out isothermal adsorption experiments on a shale sample; acquiring free air gas concentrations under the test pressures, and acquiring absorbed gas concentrations; determining Langmuir adsorption quantity and Langmuir constant according to the acquired excess absorption quantities, the free air gas concentrations and the absorbed gas concentrations; determining the gas absorption quantity of the shale according to the Langmuir adsorption quantity, the Langmuir constant and the formation pressure of stratum where the shale sample is positioned. In the determination process, the volume occupied by the gas absorption quantity is taken into full consideration, so that the error caused by the approximate equality of excess absorption quantity and absolute absorption quantity in the prior art can be avoided, the determined result of the adsorption gas content of the shale is closer to an actual result, and an objective data support is provided for the comparison of gas-bearing properties of shale in different areas.

Description

technical field [0001] The invention relates to unconventional oil and gas exploration and development technology, in particular to a method for measuring the amount of shale adsorbed gas. Background technique [0002] Shale gas is one of the unconventional oil and gas resources. Before developing shale gas, in order to effectively develop shale, it is necessary to evaluate its gas-bearing properties, and the adsorbed gas content of shale is to evaluate the gas-bearing potential of shale. One of the important reference indicators. Therefore, obtaining accurate shale adsorbed gas content is very important for shale resource potential evaluation and favorable horizon prediction. [0003] In the prior art, the adsorbed gas content of shale is usually based on the isothermal adsorption of methane, and the shale gas adsorption curve is obtained through Langmuir (Langmuir) empirical formula, and then the adsorbed gas content of shale is determined. However, in this process, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 陈磊姜振学黄何鑫高凤琳纪文明刘庆新王朋飞宁传祥
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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