Analyses And Comparison Of Formation Conditions Of Coal-bearina Unconventional Gas Of Two Coal-rich Reaions, Qinnhai Province

Muli coalfield and Wuli area which are respectively located in the northern and southern part ofQinghai Province are chosen as the main study areas in this paper. Integrated use ofmulti-disciplinary knowledge such as sedimentology,earth chemical，structural geology, petroleumgeology and others，through the combination of field investigation and laboratory study and theuse of information of regional geology, coalfield geology, coal quality, coal types, source rock andreservoir characteristics, the formation conditions of shale gas-bearing coal seams and gas hydratein the two regions are analyzed，the accumulation model of gas hydrate in Muli coalfield isgeneralized. Although the two regions experienced similar tectonic evolution history, there aredifferences in terms of hydrocarbon source rock geochemistry, physical properties of reservoirrocks, sedimentary environment and many other aspects, and the differences have the impact onthe determination of the exploration focal points in the two areas. Based on comprehensive study，the accumulation model of the non-conventional gases in coal-bearing rock strata is summed up,and the exploration and development strategies for comprehensive coal resources are made forproviding the foundation on evaluation of the non-conventional energy resources in QinghaiProvince.