Working face multi-source methane prediction method based on carbon and hydrogen isotopes

Abstract

The present invention relates to the technical field of methane control of mines, in particular to a working face multi-source methane prediction method based on carbon and hydrogen isotopes. The present invention, by performing lab analysis of methane components and test of carbon and hydrogen isotopes on a coal sample and a methane sample collected on site, mainly analyzes compositional differences of delta 13C (CH4), delta D (CH4), delta 13C (CO2) and other carbon and hydrogen isotopes corresponding to methane gas of a single coal layer and mixed methane gas of multiple coal layers; and determines working face multi-source methane sources and ratios of the methane sample using a mathematical method. The present invention, using a carbon and hydrogen isotopes analysis method, quantitatively analyzes compositional characteristics and ratios of their sources in the mixed methane gas of the methane sample and provides a new working face multi-source methane prediction method, thereby offering a basis for methane extraction and control of the coal layer and specifying methane sources. Therefore, methane control will be focused, thereby avoiding blind control and unnecessary input.

Description

technical field [0001] The invention relates to the technical field of mine gas control, in particular to a method for predicting multi-source gas in a mining face based on hydrocarbon isotopes. Background technique [0002] In the gas gushing from the fully mechanized mining face, the gas flowing from the adjacent working face to the working face of the coal seam accounts for a high proportion, which is also the root cause of the gas exceeding the limit. Reasonable ventilation methods can alleviate the pressure of gas control to a certain extent, and by draining the gas accumulated in the goaf, it can effectively prevent the gas concentration in the working face and return air flow from being too high. In the mining process of multiple coal seams, it is very important to study the gas migration law and emission ratio of the coal seam mining face overlying the overlying coal seam, so as to effectively strengthen the gas control of adjacent layers and ensure the safe and effi...

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Problems solved by technology

However, at present, the separate source prediction method is used to predict the gas source, and it is impossible to accurately and quantitatively predict the gas in the adjacent layer.

[0003] At present, through years of discussion by scholars, the theory of gas migration has been developed by leaps and bounds in my country, but there are not many studies on the laws of multi-source gas migration. Numerical simulation methods cannot specifically quantify the source and proportion of multi-source gas emission (previous predictions for multi-source gas were only based on empirical means)

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