Shale gas content calculation method

A technology of shale gas content and calculation method, which is applied in the field of shale gas content calculation, can solve the problems of accurately obtaining gas content, etc., and achieve the effects of easy acquisition, improved calculation accuracy, and wide application range

Active Publication Date: 2020-01-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0016] To sum up, the existing methods cannot quickly and accurately obtain the gas content of a large number of rock samples. Theref

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  • Shale gas content calculation method
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  • Shale gas content calculation method

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[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0054] The present invention proposes a new method for calculating the gas content of shale. The method of the present invention is based on the basic relationship between the measured adsorption capacity and the absolute adsorption capacity. First, a new method for calculating the adsorption phase volume is established through analysis, and then a new method for calculating the absolute adsorption capacity is derived, and then the gas content and the absolute adsorption capacity are used , The relationship between the measured adsorption capacity establishes a new gas content calculation model, the model uses the measured isotherm adsorption data, porosity and other data of shale to realize the calculation of the gas content. This method can reduce the time and financial cost of obtaining shale gas content and improve the calculation accuracy of gas content.

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Abstract

The invention provides a shale gas content calculation method, belonging to the field of shale exploration and development. The method comprises the steps of collecting experimental data; and then inputting the collected experimental data into a shale gas content calculation model to obtain the shale gas content under a reservoir condition, or inputting the collected experimental data into the shale gas content calculation model to obtain a curve of pressure and the shale gas content and then acquiring the shale gas content under the reservoir condition from the curve. According to the method,the shale gas content can be rapidly obtained; the process is simple and convenient; used basic data are easy to obtain; the time and financial cost for acquiring the shale gas content can be obviously reduced; meanwhile, gas content calculation precision can be improved; and the application range of the method is wide.

Description

technical field [0001] The invention belongs to the field of shale exploration and development, and in particular relates to a method for calculating the gas content of shale. Background technique [0002] At present, the gas content of shale is generally obtained by on-site pressure-holding coring test, which requires the use of on-site desorption data to inversely calculate the gas content of shale under reservoir conditions, but some gas content will be lost before the core is put into the desorption device , many factors such as coring methods, measurement methods, and estimation methods will affect the size and law of gas loss, and there is no accurate method to calculate this part of gas loss; in addition, the time and financial costs of field testing methods are high, and it is impossible to quickly Obtain the gas content of a larger number of rock samples. Well logging and nuclear magnetic resonance methods often use the data obtained by the desorption method to cor...

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 左罗蒋廷学曾义金王海涛卞晓冰李双明肖博
Owner CHINA PETROLEUM & CHEM CORP
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