Abstract：The paper introduced the geologic general sit-uation and tectonic evolution history. On that ba-sis, the paper analyzed the oilj gas accumulationcondition in the region, and considered that the Ne-ogene Shawan Formation oil source in the regioncome from Jurassic, which belonged to mediocre-good reservoir;the depth of mudstone developed ininterior of Shawan Formation is moderate, whichhas good sealing property that can be taken as capof oil/gas reservoir. Since migration of lakestrandline, denudation and overlap in different sedi-mentary stages, the different kinds of subtle trapshave been formed in gentle slope, including updippinchout trap, lithologic lens, stratigraphic overlap, stratigraphic unconformable trap and fault-lithol-ogic trap. According to integrative study, the paperconsidered the region has good oil/gas accumula-tion condition, which can become an important ex-ploration field.
