Abstract:

The composite traps developed in eastern Sichuan Carboniferous are mainly stratumstructure ones with variety of traps and fully filled，they are the one of many further explorative targets.There are poretyped and fracturetyped gas reservoirs and the latter is dominant，in general，the pore diameter is small and the porethroat system is poor in sorting，microfractures are well developed，connection is good，most of the system are characterized by midpore and small throat.Carboniferous reservoirs are mainly developed in Member II and III of Huang Formation.The regions in strong erosion and adjacent Carboniferous erosive margin are the lacking ones of natural gas reservoirs，nearby，there is the possibility of forming composite gas traps.Sedimentary facies controls in reservoir rocks，diagenesis determines accumulation and permeability of the reservoirs，the ancient karsting and tectonic activity developed on ancient uplift further controlled and improved permeability of the reservoirs.

Key words: eastern Sichuan, carboniferous, composite trap, control factors, reservoir