Method and device for predicating adsorption gas content of mud shale
A prediction method and technology of a prediction device, which are applied in the field of natural gas exploration, can solve the problem of low prediction accuracy of the content of adsorbed gas in shale, and achieve the effect of solving the low prediction accuracy
Inactive Publication Date: 2015-03-25
CHINA UNIV OF PETROLEUM (BEIJING)
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[0004] The invention provides a method and device for predicting the content of adsorbed gas in mud shale, which is used to solve the technical problem that the prediction accuracy of adsorbed gas content in mud shale is not high in the prior art
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[0033] figure 1 A schematic flow chart of a method for predicting the content of shale adsorbed gas provided by an embodiment of the present invention, as shown in figure 1 shown, including:
[0034] 101. For each shale sample collected in the research area, at each temperature T, use the isothermal adsorption method to calculate, and obtain the Langer volume V of each shale sample at different temperatures T L , and the Rankine pressure P of each shale sample at different temperatures T L .
[0035] Specifically, for mud shale samples collected in the same research area, samples can be collected at different depths in different wells of the same set of mud shale reservoirs, the organic carbon content of the samples can be analyzed, and the organic matter abundance TOC can be measured, for example: mud shale The number of rock samples is at least 5. Select mud shale samples with different organic matter abundance TOC, conduct isothermal adsorption experiments under equilib...
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The invention provides a method and a device for predicating adsorption gas content of mud shale. The method comprises the following steps: according to Langmuir's Volume VL, acquired in a research area, of each shale sample under different temperatures T, establishing a first relational expression between the Langmuir's Volume VL, the temperature T and the abundance of organic matter TOC of the mud shale sample; according to Langmuir's pressure PL of each mud shale sample under different temperature T, establishing a second relational expression between the logarithm of Langmuir's pressure and the reciprocal of the temperature T, substituting the first relational expression and the second relational expression into Langmuir's equation to obtain a third relational expression of the temperature T, the pressure P, the abundance of organic matter TOC of the mud shale sample and the adsorbed gas content V; and finally, predicating the adsorbed gas content V of the research area according to the third relational expression. The method solves the technical problem that the predicating accuracy of the adsorbed gas content of the mud shale in the prior art is not high.
Description
technical field [0001] The invention relates to natural gas exploration technology, in particular to a method and device for predicting the content of adsorbed gas in mud shale. Background technique [0002] Natural gas can be adsorbed on the surface of shale particles, and the natural gas that exists in this way is usually called adsorbed shale gas. Adsorbed shale gas, as a main natural gas storage method, accounts for 20% to 85% of the total gas content of shale gas. Therefore, the adsorbed gas content of mud shale is a key parameter for evaluating shale gas resources. It is an important indicator to predict whether the shale has mining value. [0003] In the prior art, mud shale samples are usually collected in the research area, and the isothermal adsorption method is used to calculate the adsorbed gas content of the mud shale samples, and the calculated results are used as the predicted value of the mud shale adsorbed gas content in the entire research area . But in ...
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IPC IPC(8): G01N7/00
Inventor 纪文明宋岩杨潇姜振学李卓郝进
Owner CHINA UNIV OF PETROLEUM (BEIJING)