Oil Pool-Forming Effects of Neotectonic Movement in Jiyang Depression

Neotectonic movement in the Jiyang depression mainly formed faults and anticlines,especially, the large revived faults and its fractures. These structures play a important role in the processes of oil and gas accumulation. Neotectonic movement induces and drives oil and gas out from hydrocarbon source rocks in form of faults system,which improves efficiency and power of expulsion and influents orientation of oil and gas migration and controls north-east extension of main pools;conducts and envelops oil and gas, small faults and microcracks conduct oil and gas,form pool of sandstone lens in sub-depression; Neotectonic movement controls hydrocarbon to cyclic accumulate;mufti-conductive systems linked large upper Tertiary drape anticlines and prolific source rocks and formed large and medium size fields like Gudao and Chengdong and so on. In this paper,above-described effects derived from Neotectonic movement in the processes of reservoir-forming is called oil pool-forming effect whose study can reevaluate petroleum resources of basin,and reveal mechanism,pattern and law of oil pool-forming.