Late-stage rapid accumulation of the PL19-3 giant oilfield in an active fault zone during Neotectonism in the Bozhong depression, Bohai Bay

摘要: Late-stage is defined here as the period when Neotectonism occurred since 5.1 Ma. Most petroliferous basins in China lie areas where intensively. In recent years, Chinese petroleum geologists have paid much attention to late-stage accumulation. The PL19-3 giant oilfield situated faulting activities violently during Neotectonism. To understand mechanism of lat-stage rapid accumulation, we discussed most important aspects responsible for formation oilfield, including oil generation, active oil-source rock occurrence, fault activity and conduits, injection well distinguishing indicators. This study shows that: (1) sufficient was supplied field Ma because structure surrounded by four sags which three intervals high-quality source rocks remained Neotectonism; (2) densely distributed faults high porosity/permeability sandstone carrier beds comprised effective conduit system migration injection; (3) migrated along charged rapidly means seismic pumping triggered frequent earthquakes Neotetonism. It documented that elevated reservoir temperature, abnormal geothermal gradients abnormally homogenization temperatures fluid inclusions are indicators