Geological Control Factors Of Gas Occurrence And Deep Gas Prediction In Longquan Coal Mine,shanxi Province

Studying the law of coal seam gas occurrence and predicting the content of coal seam gas is of great practical significance,whether for better control of gas disasters or for opening up and utilizing gas resources.Based on the theory of gas geology,this paper obtains the relevant gas data in the production process through underground testing in the study area,and carries out statistical analysis.Based on the grey relational analysis of weight factors,the main geological control factors of gas occurrence in the study area are mastered.On this basis,the gas prediction model is constructed by using multiple linear regression,and the deep gas in Longquan Coal Mine is predicted.The main research results are as follows:After calculating the fractal dimension of faults and the curvature of fold structures in the study area,normalized processing and arithmetic average,the structural index of the study area is 0-0.5248.The structural complexity of the study area is "low in East and west,high in middle",and the high value area of structural index is characterized by north-south strip distribution.The distribution characteristics of structural index coincide with the development degree of faults and folds in the study area.The main geological factors affecting gas occurrence in the study area can be summarized as mine structure,coal seam burial depth,coal seam thickness and roof surrounding rock sealing.There is a positive correlation between each single factor and gas content in general.The linear relationship between burial depth and gas content is more significant,the correlation between other factors and gas content is relatively poor,and the data is more discrete.Four factors of tectonic index,burial depth,coal thickness and roof mudstone thickness in the study area are analyzed.Grey correlation calculation is carried out with burial depth as the matrix sequence,and the relationship between each factor and gas occurrence(weight)is revealed.Taking gas content as Y variable and structural index,burial depth,coal thickness and roof mudstone thickness as explanatory variable X,the regression equation between gas content and various factors was obtained by multiple linear regression.Through F test,the regression equation was established,and the correlation coefficient was high and the correlation was significant.On this basis,the northernpart of the study area is forecasted,with an average deviation of 14.3%.The forecasting results have reference value for guiding production.