Distribution and exploration direction of medium- and large-sized marine carbonate gas fields in Sichuan Basin, SW China

Xinhua MA,Yu YANG,Long WEN,Bing LUO

Table 1 Brief description of marine stratigraphic development characteristics of three major oil- and gas-bearing basins in western China.

Basin Stratum develop- mental time Number of series of strata Total stratum thickness/m Development of hydrocarbon source rocks Basic characteristics of reservoir stratum Sichuan Basin Sinian period - Middle Triassic epoch, about 420 Ma 8 3 000-5 000 4 series of strata, widely distributed There are many types of carbonate reservoirs, which are characterized by sedimentary facies control. Tarim Basin Sinian period - early Permian epoch, about 360 Ma 5 2 000-3 000 2 series of strata (Lower Cambrian, Ordovician), unevenly distributed Mainly karst fracture-cave reservoir Ordos Basin Sinian period - Ordovician period about 200 Ma 2 About 2 000 2 series of strata (Cambrian, Ordovician), locally distributed Mainly karst pore-cave reservoir