Shale adsorbed gas content dynamic calculation method based on Langmuir model

A calculation method and technology for adsorbing gas, which can be used in material inspection products, soil material testing, etc., and can solve problems such as lack of shale gas reservoir core calibration in calculation formulas, large differences in geological background of shale gas reservoirs, and errors in calculation results. , to solve the problem of content evaluation, the results are accurate and reliable, and the effect of high calculation accuracy

Active Publication Date: 2016-08-10
SOUTHWEST PETROLEUM ENG CO LTD SINOPEC
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Problems solved by technology

However, there are some shortcomings in the application of American shale adsorption gas content interpretation technology in China: the geological background of shale gas reservoirs in the two countries is quite different
The calculation method of the shale a

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  • Shale adsorbed gas content dynamic calculation method based on Langmuir model
  • Shale adsorbed gas content dynamic calculation method based on Langmuir model
  • Shale adsorbed gas content dynamic calculation method based on Langmuir model

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[0029] Langmuir model It is a commonly used model to describe the isotherm of methane adsorption by coal and shale kerogen. The Langmuir volume V L And Langmuir pressure P L It is the most important parameter to determine the content of adsorbed gas.

[0030] A dynamic calculation method of shale adsorbed gas content based on Langmuir model, the calculation model is:

[0031] Agas = V LT * P P LT + P = F ( T ) * V L 0 * P P LT + P

[0032] Where

[0033] Agas is the content of adsorbed gas, m 3 / t;

[0034] T is the formation temperature, T 0 Is the laboratory standard temperature, ℃;

[0035] V LT Is the Langmuir volume at any temperature, m 3 / t, V LT =V L0* F(T);

[0036] F(T) is the temperature correction function of Langmuir volume, F(T)=exp(A*(T-T 0 ));

[0037] V L0 Is Langmuir volume at standard temperature, m 3 / t, V L0 =A 1 *TOC+B 1 ;

[0038] P LT Langmuir pressure at any temperature, MPa, P LT =A...

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Abstract

The invention discloses a shale adsorbed gas content dynamic calculation method based on a Langmuir model. On the basis of experimental analysis and log data, by analyzing the influencing factors of the shale adsorbed gas content, the invention finds the change law of a Langmuir volume and Langmuir pressure along with temperature, pressure and total organic carbon content, and then puts forward the shale adsorbed gas content dynamic calculation method based on the Langmuir model. The method solves the calculation problem of the shale adsorbed gas content, and has high calculation precision.

Description

technical field [0001] The invention relates to the technical field of shale gas logging evaluation, and mainly relates to a method for quantitatively calculating the content of shale adsorbed gas by using logging information. Background technique [0002] At the end of 2011, China officially listed shale gas as a new mineral species and became a new growth point of oil and gas resources. The evaluation of shale gas adsorption content is the core technology and technical problem in the exploration and development of shale gas. The accuracy of adsorbed gas content directly affects the accuracy of shale gas reservoir evaluation and reserve calculation results, and affects the decision-making of exploration and development. [0003] At present, there are mainly three ways to calculate the adsorbed gas content: [0004] One is to use the Langmuir volume and Langmuir pressure determined in the laboratory to directly calculate the adsorbed gas content. This is static data, which...

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Application Information

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IPC IPC(8): G01N33/24
Inventor 张筠何传亮葛祥黎泽刚樊靖宇季凤玲李阳兵张世懋何会
Owner SOUTHWEST PETROLEUM ENG CO LTD SINOPEC
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