INFLUENCE OF EARTHQUAKE EVENT SEDIMENTATION ON HYDROCARBON ACCUMULATION IN THE SHA 3 MEMBER OF THE SHAHEJIE FORMATION OF THE PALEOGENE IN THE SHANGHE OILFIELD, CHINA

The tectonic activity of the Shanghe Oilfield during the sedimentary period of the Sha 3 Member was strong, and earthquake events occurred frequently. The earthquake events left many records of deformation in the strata, namely the seismite. The formation of seismite is affected by many factors. In this paper, combined with the structure and single well sequence characteristics, the characteristics and formation causes of seismites in the study area were analyzed in detail. The results show that the sedimentary period of the Shahejie Formation in the Shanghe Oilfield entered the deep depression period with strong fault activity. Based on the sedimentary model of the research area established by the previous, it is concluded that the earthquake event has an important influence on the secondary differentiation of the sand body in the study area. At the same time, combined with the seismic distribution characteristics of different regions in the study area, the sedimentary pattern of earthquake events in the study area was established. Finally, combined with the examples of reservoirs in the study area and the distribution characteristics of the seismites, the effects of earthquake events on hydrocarbon accumulation were analyzed.