Accumulation Analysis Of Lithologic Oil Reservoir In Shahejie Formation,Gunan Sag

Periphery area of Gunan sag lies in Zhanhua depression,Bohai bay basin,including eastern,southern area of Gunan sag and Hongliu region.Since Gu-dong oil field was found,several hundreds of million tons level of large oil fields have emerged,but the research focuses on Neogene Period,besides,the reservoirs are nearly all tectonic reservoirs.With increasing degree of exploration,reservoir research directions are also to be diversified.The work area develops a lot of fan-delta sand bodies in Shahejie formation in Paleogene Period,which has lithological reservoirs conditions.Bases on the research of periphery area of Gunan sag,This thesis systematic and detailed evaluates accumulation potential of lithological reservoirs.This theise analyzes tectonic features,sedimentation system,reservoir property of the area,examining the potential of lithologic oil reservoirs.Use ants tracking technology to analyze faults and Shahejie formation tectonic characteristics.Over on the dissection of KD52 typical lithological reservoirs and research of “six points and four surface” controlling factors for the lithologic trap to speculate favorable lithological reservoirs in vertical layers on the plane.Work area mainly develops fan-delta sedimentary phases.Layers in Shahejie formation experienced two sedimentary cycles.During the transition of sequences,lithology changes control the formation of oil accumulation.