关键词: 大巴山地区, 前陆盆地, 冲断带, 下沙溪庙组, 河流—三角洲沉积

Abstract: On the basis of outcrop survey,seismic interpretation and a lot of coring data,the evolution and exploration potential of Dabashan foreland basin were analyzed.This foreland basin was formed in the mid-Yanshan cycle and underwent four stages including J₁-J₂¹ depression stage,J₂²-J₃ foreland basin stage,K₁-N basin shrunk and final deformation of thrust-folded end in Himalayan period.In this basin,two sets of high-quality resource rocks developed in the Daanzhai Formation and Lianggaoshan Formation have high abundance of organic matters which mainly contain Ⅱ₁ type and Ⅱ₂ type kerogen.The favorable assemblages of source-reservoir-cap rocks in Jurassic include self-generated and self-reservoir type Daanzhai Formation and Lianggaoshan Formation as well as lower-generated and upper-reservoir type lower Shaximiao Formation.The favorable plays include the thrust belt in Dabashan area,sag in the north Sichuan province and uplift in the central Sichuan province.

Key words: Dabashan area, foreland basin, thrust belt, lower Shaximiao Formation, fluvial-delta deposit