Study On Structural Characteristics And Gas Occurrence Prediction Of Zhaoxian Coal Mine In Shanxi Province

On the basis of systematical arrangement and comprehensive analysis of zhaoxian coal mine geological data,combined with regional tectonic background analysis and mine geological observation,this paper summarizes the regional structural characteristics and evolution of coal mine,and emphatically analyzes the mine structural characteristics and evolution rules.This paper quantitatively evaluates the complexity of mine structure in the study area,summarizes the change and distribution law of gas,the influence of different geological factors on gas storage,and emphatically analyzes the control effect of structure on gas storage.Using the method of multivariate linear regression,the fitting relationship between the structural index,the buried depth of coal seam,the thickness of coal seam and the thickness of mudstone on the roof of coal seam and the content of gas is determined.Thus,the gas content in the southern part of the first mining area is predicted.The early tectonic evolution in the study area and north China plate,the plate lifting hercynian movement,steady decline in the Triassic,late Triassic to early Jurassic indosinian movement performance in the study area for the overall rise,denudation,makes the lack of formation,middle Jurassic continued decline and uplift,parallel unconformity contact between rocks,late Jurassic to the overall uplift,lack of formation,lower cretaceous in rapid sedimentary stage,late cretaceous-paleogene ji squeezed in the study area,rise by folding state,causing formation is missing,since neogene,on the whole is relatively stable,intermittent deposition,mild erosion.Systematically analyzed the influence of geological factors such as fold,fault,coal seam depth,coal seam thickness and roof mudstone thickness on mine gas occurrence.The fractal dimension of fault and the curvature of fold structure were used as the evaluation indexes of structural complexity,and the calculated structural index was0-0.7646.Based on the quantitative evaluation results of structural complexity,the paper quantifies the structural indicators and analyzes its influence on gas content with multi-linear regression method along with numerical indicators such as coal seam depth,coal seam thickness and coal bed mudstone thickness.Predict the gas content southern sector of the first mining area.