FU Guang XUE Yong-chao FU Xiao-fei

Through studying gas distribution characteristics of deep strata in Daging piacanticiine and its eastern area, this paper puts forward four factors controiiing the formation of gas reservoirs in deep strata. They inciude conditions of gas source rock, caprock, fauit and surface of unconformity. And furthermore we anaiyzed their controis the formation of gas reservoirs. Based on these, the paper deiineates four kinds of gas accumuiation modeis in deep strata, inciuding the accumuiation modeis of gas migration shortiy through surface of unconformity into weathering crust of basement, gas migrating through fracture into voicanic rock in gas source rock, gas migrating through surface of unconformity or sandbody and fauit into aii kinds of traps over the ancient upiift, as weii as the accumuiation modei of gas migrating iateraiiy through sandbody into stratigraphic overiap traps, finaiiy this paper prospect the favorabie gas expioration targets in deep strata.