THE FAULT TECTONIC FEATURES AND ITS CONTROL ROLES TO OIL AND GAS ACCUMULATING IN TANGYUAN FAULT DEPRESSION
Luo Qun, Bai Xinhua (Daqing Petroleum Institute, Anda 151400)
Tangyuan fault depression is a typical on shore basin controled by faults.The faults developed very well in this depression.There are two main ranging directions NE and NW—NWW directions.The fault distribution has the characteristics of east-west dividing zones and south-north dividing blocks.the faults are divided into seven genetical types. The roles of the fault controling on oil and gas occuring,migrating and accumulating are shown by the base big fault coutrolling on hydrocarbon organic source distribution,and the main fault coutrolling on trap formation and distribution. Faults worked as oil and gas migrating channels during fault opening. Seal faults provided good conditions for stopping oil and gas moving and accumulating.