Discussion on the Hydrocarbon Exploration Potential of Non-Structural Reservoir of the Pinghu Slope in Xihu Sag

Pinghu slope has been the major area of hydrocarbon exploration in Xihu sag in recent years.The oil and gas accumulation conditions in Pinghu slope is favorable,but the oil and gas fields we have found are small scale faulted block oil and gas field due to the well developed faults.Therefore,it is believed that the individual oil and gas reservoir is small in scale,and the hydrocarbon exploration potential in Pinghu slope is limited,which has restricted the further exploration in the study area.Based on the geological characteristics,with focus on study about the non-structural traps of the study area,comprehensive geology analysis has been conducted,and seismic facies and sedimentary facies have been analyzed,and the possible types of non-structural reservoirs in the study have been predicted.It is believed that the favorable non-structural reservoir types in Pinghu slope are mainly large fan delta structure-lithological traps which are controlled by the footwall of the large fault,the lithological traps of beach bar in the buried hill,and the lithological traps of updip pinching out in the intertidal zone.It's possible to find large-size oil and gas fields through exploration of the non-structural traps,and the hydrocarbon exploration potential can be increased greatly.