Reasearch On The Master Control Geological Factor Of Mining CBM In Deep-Buried Coal Seam

In the process of deep coal seam CBM development, domestic researchers study of coal reservoir is not comprehensive, most have focused on the coal seam itself, the in-situ stress, buried depth, ground temperature, coal bed geological factors such as fracture parameters on the reservoir permeability and the impact of capacity research scope is not enough, therefore our country in deep coal seam of coal bed methane exploration and development of coal reservoir system in the process of theoretical knowledge is restricted to a certain extent.Paper mainly ooze south basin coalbed methane exploitation of vertical Wells as the study area, from the relevant geological controlling factors of production, this study persimmon north zhuang showed that temperature increased with the increase of buried depth, a linear increase in shallow; The increased trend in deep. Therefore, in the deep temperature increased, the temperature even more important for the control of air content, temperature increase makes deep thermogenic gas content increases; Coalbed methane thermal activity increased at the same time, the coalbed methane desorption quantity increase. So in persimmon north zhuang geothermal factor is an important influence factor for CBM development.Maximum principal stress direction for coal reservoirs are almost parallel to the edge crack development direction to relatively tensioning state, it will be beneficial to the increase of coal reservoir permeability. Because this kind of interaction relations, will result in qinshui basin of 3 # coal reservoir permeability increased with the increase of the principal stress difference, better and makes the qinshui basin reservoir condition, present a 3# coal seam in qinshui basin coal reservoir permeability larger exhibition’s principal stress difference larger areas, it will help of qinshui basin CBM development.When fracture trend and the maximum principal compressive stress direction is less than 45°, can improve the crack opening, with the decrease of the Angle between the opening become bigger, to improve coal reservoir permeability; When the direction of maximum principal compressive stress and fracture trend is more than 45 °, can reduce the crack opening, with the increase of Angle between the crack opening become smaller, is not conducive to improve the coal reservoir permeability. Fracture trend in the study area and the Angle between the horizontal maximum principal stress direction basic less than 45 °, thus is helpful for the improvement of the crack opening, it will improve the coal reservoir permeability. Thus is conducive to the enrichment and development of coalbed methane.In southern qinshui basin persimmon north zhuang reservoir gas content is higher, no. 3 coal seam gas content is 3.55m~3/t~25.49m~3/t. 15 coal reservoir gas content is 8.15m~3/t~27.07m~3/t. No.3 and no.15 coal seam gas content is from the southeast to the northwest to gradually with the increase of buried depth is larger trend. Air content has obvious zoning characteristics along with the change of depth.