Method for judging content of free gas and adsorbed gas in shale gas

A determination method and free gas technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of reducing calculation accuracy, not using gas content parameters, and indirectly calculating free gas, etc. The effect of promotion

Inactive Publication Date: 2018-06-01
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0003] However, there are many problems in the above-mentioned judgment method. First, the judgment methods of logging and mud logging are obtained through a series of fitting or calculation with the help of parameters reflecting the properties of shale, without the use of gas content parameters, which is a kind of Indirect method for calculating free and adsorbed gas content
Then, the data such as porosity, gas saturation, TOC content, etc. given by the logging data are also indirectly obtained, not actual measured data, which will inevitably reduce the accuracy of calculation

Method used

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Embodiment Construction

[0012] The content of the method for determining the content of free gas and adsorbed gas in shale gas of the present invention will be described in detail below in conjunction with the examples.

[0013] 1. On-site analysis and sample collection of shale cores

[0014] A high-precision gas content tester was selected for the field analysis experiment of shale cores (patent publication number: CN202362223U publication date: 2012.08.01). After the drilling core is taken out, it is quickly put into the analysis tank for gas analysis at room temperature. After the gas is released at this stage, the gas collection measuring cylinder is removed and placed underwater with a special gas sample bag for gas collection. The analysis experiment of the second stage was then carried out, and the analysis temperature was set to be the formation temperature of the core calculated according to the geological background of the study area. Finally, analyze at the high temperature stage, set th...

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Abstract

The invention discloses a method for judging the content of free gas and adsorbed gas in shale gas. The content of the free gas and the adsorbed gas in the shale gas is judged by collecting gas samples at different temperature sections of a shale field analysis experiment in the shale gas drilling process and combining the field analysis total gas content and methane carbon isotope experimental data. The content of the free gas and the adsorbed gas in the shale formation section can be quickly obtained with the method and is directly connected with the shale gas content, so that the influenceof intermediate parameters is reduced, accuracy of results is improved, and the method has the advantages of being easy to popularize and convenient to implement.

Description

technical field [0001] The invention relates to shale gas occurrence evaluation technology, in particular to a method for judging free gas and adsorbed gas in shale gas. Background technique [0002] The determination of the content of free gas and adsorbed gas in shale gas is of great significance to the evaluation of shale gas geological reserves. At present, the judgment of free gas and adsorbed gas content in shale gas mainly depends on logging and mud logging data. For the determination of free gas content, the more commonly used method is to calculate from the porosity and gas saturation in logging and mud logging data. For adsorbed gas, a large number of isothermal adsorption experimental data show that the amount of adsorbed gas in shale often has a good positive correlation with shale organic carbon content (TOC). Therefore, the adsorbed gas content is calculated by fitting the shale TOC data in geochemical mud logging. [0003] However, there are many problems i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/241
Inventor 刘飏张金川唐玄刘子驿魏晓亮
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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