Analysis of key factors of gas content in fold area based on grey entropy correlation theory

Abstract

The gas storage conditions in a fold area are complex, and there are many influencing factors. Therefore, it has been the focus and challenge of regional gas control. Based on the analysis of the forces acting on the geological structure in a fold area and the law of gas migration, this study derives six factors controlling the gas content in the fold area. Then combined with grey entropy correlation theory, a grey entropy correlation analysis method is proposed to screen the key factors of gas occurrence in complex fold area. Finally, taking the anticline fold area of a mine in western China as an example, the main factors controlling the gas content in this area are studied using the grey entropy relational analysis method. And the fitting equations of the regional gas content and main controlling factors are obtained using the multiple regression method. This study provides a basis for mine gas disaster prevention and control. These results show that the entropy degree of the burial depth of the coal and the distance between the measuring point and the outcrop of the coal seam are 0.996 and 0.989, respectively, which are the key factors controlling the gas occurrence in this area. Then we use multiple regression method to get the regression equation of regional gas content and main control factors, which provides a basis for mine gas disaster prevention and control.