| The divison of CBM development unit is the foundation of coal&CBM coordinated development.Taking Jincheng and Yangquan miming area as example,the paper has profoundly analyzed the coal bearing characteristics of coal reservoir,CBM content characteristics,porosity and permeability,alteration of reservoir by geological analysis and laboratory test.The main coal seam is No.3 in Jincheng mining area and No.15 in Yangquan mining area.Compared to Jincheng mining area,it has lower methane concentration and low gas content in Yangquan mining area.The well test result demonstrates that the permeability of Jincheng is better than Yangquan.The laboratory test result is shown that the Horizontal permeability is higher than vertical direction in Jincheng mining area,and Yangquan has the contrary result.From the view of geostress-controlling,CBM reservoirs of the two mining areas are favorable to crack opening.The stress sensitivety of permeability of reservoir are shown higher in Chengzhuang coal mine,Wenjiazhuang coal mine,Sijiazhuang coal mine.Integrated with ANSYS software simulation,the modern geostress are been simulated,then the lower stress are been selected.Based on the above,chosing CBM content,buried depth,coal thickness,distribution of geostress in main coal seam,the CBM development unit in the two coal mining area are been divided.The result shows that the east block of Sitou fault in Jincheng and Heshun block in Yangquan are most favorable location for CBM development.Further,in case of Sijiazhuang coal mine and northern area of Sihe coal mine east well district,considering specific geological conditions,reservoir physical property of main coal seam,exploitation and deployment of coal mine,the CBM development unit of the coal mine area are been divided respectively and put forward corresponding technology target for different development unit.The conclusion are instructional for coordinated development of coal&CBM in two coal mining area. |
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