FORMATIVE TYPES OF LITHOLOGICAL GAS POOLS IN CARBONIFEROUS CARBONATES IN EASTERN SICHUAN

The relations among the lithology, rock fades and porosity, as well as the factors controlling the formation of lithological traps in Huanglong Formation, Carboniferous system, Eastern Sichuan were analysed. Three types of lithological traps of carbonates in the area were suggested, i.e. sedimentary facies trap, lithological updip trap and composite lithological trap. The intensely folded and the areas with complex structures are favourable for the formation of composite lithological traps.