Geological structure characteristics of Yushutian Coal Mine and its influence on coal seam gas occurrence
In order to clarify the influence of geological structure characteristics on coal seam gas occurrence in Yushutian Coal Mine,Xinjiang Province,theoretical analysis,numerical simulation,mathematical statistics,experimental testing and other methods was adopt-ed to study the geological structure and evolution characteristics of the mine field,the history of buried and uplifted coal-bearing strata,coal seam metamorphism,gas generation and occurrence characteristics,etc.,providing theoretical guidance for gas disaster prevention and control in Yushutian Coal mine.The results show that the structure of the mine field as a whole is an asymmetric broad and gentle syncline with westward dip,which belongs to the tangential strain active folding mode.The coalbed methane in the mine field mainly un-dergoes three stages of generation and escape.The maximum buried depth of coal seam is about 2 900 m,the maximum ground tempera-ture is over 110℃,the cumulative production of coal seam gas is at least more than 50 m3/t,and the structural uplift causes about 80％of coal seam gas escape.Under the influence of tangential strain active folding(synclinal)and burial depth,the well field gradually tran-sitions from the low stress-weak strain-high permeability condition on the two wings to the high stress-strong strain-low permeability con-dition in the core,which leads to longer and longer gas escape path,greater and greater escape resistance,and higher gas content and pressure in the coal seam.The differential structural compression deformation causes the southern wing strata to be under stronger high stress,strong strain,and low permeability conditions compared to the northern wing,resulting in higher gas escape resistance,gas con-tent,and pressure in the southern wing coal seams.
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