Re-recognition of “unconventional” in unconventional oil and gas

JIAO Fangzheng

Table 3 Statistics on temperatures of conventional gas reservoirs and shale gas reservoirs in Sichuan Basin.

Target stratum Reservoir lithology Gas source rock Pressure coefficient Temperature of gas reservoir/°C Carboniferous Huanglong Formation in Eastern Sichuan Basin Dolomite Longmaxi Formation 1.2-1.3 80-110 Longmaxi Formation in Fuling block Siliceous shale Self-generation 1.55 90-120 Longmaxi Formation in Changning block Siliceous/calcareous shale Self-generation 1.2-2.1 110-140 Longmaxi Formation in Weiyuan block Siliceous/calcareous shale Self-generation 1.3-2.3 100-134