关键词: 韩城, 煤层气, 主控因素, 产能模式, 含气量, 渗透率

Abstract: Based on the fact that the production of gas wells in Hancheng mining area is quite different, in order to make clear the main factors of production control, three production models of single well are summed up on the basis of production data of Hancheng mining area,，Mode I: single peak –attenuation type，Mode II: single peak- stable type and Mode III: multi peak -discontinuous type. The characteristics of medium high yield wells, low producing wells and non producing gas wells are respectively represented . Based on the geological, structural and drilling data, the influencing factors of productivity model are analyzed from three aspects of coal seam thickness, gas content and permeability, It is considered that the thickness of coal seam has little influence on productivity characteristics, and the gas content and permeability condition are the main controlling factors. The structure and hydrogeological condition have important influence on the gas content in the area, and the overall preservation condition is superior. Besides the southeast edge and the shallow part, the gas content in the other areas is higher. The permeability is mainly affected by the coal structure and depth control, generally in the regions of fractured coal is of high permeability, pulverized coal, coal particle area is relatively low, and the permeability of the primary structure coal area by depth control. The results show that coalbed methane production is mainly controlled by structure. It controls gas content, hydrogeological characteristics, depth of formation and structure of coal. It is the key factor that affects the productivity of CBM well in this area.