The Reservoir Patterns Of Buried Hill In The Shaxibei Area Of The Bohai Sea

Shaxibei tectonic lower palaeozoic era buried hill no big breakthrough in recent years,predecessors through well and seismic combination forecast the sedimentary facies in this area.Liangjiashan Formation and Yeli Formation's Open platform phase is the most favorable reservoir facies belt,and based on the reservoir development mode to optimizing the favorable areas,but the patterns and reservoiring conditions know very little.Making the study of Shaxibei lower Paleozoic carbonate buried hill basic petroleum geological conditions,the mechanism of reservoiring and reservoiring pattern has important practical significance and theoretical significance.Based on Shaxibei lower Paleozoic carbonate buried hill basic petroleum geological conditions,applying the drilling geological,well and seismic data,Hydrocarbon source rocks and crude oil geochemical analysis data,reservoir,cover and conducting channel of petrology,rock geochemistry and reservoir physical property analysis of test data,tectono-sedimentary evolution of development to clarify the distribution of buried hill hydrocarbon accumulation geological factors and oil and gas enrichment mechanism and its control factors.Made the following understanding:(1)CFD2-1-2 and CFD8-1-1 well's crude oil belongs to Shayi section,CFD1-6-1 well's crude oil is Shahejie group mixed crude oil,LPN-1 well's crude oil is Shasan section's crude oil.(2)LPN-1 well and CFD2-1-2 well reveal that buried hill formation directly lie on the Shayi and Shasan section's formation,the effective hydrocarbon source rocks that contact directly with buried hill could be the foundation of the carbonate buried hill hydrocarbon accumulation.(3)Bohai sea buried hill reservoir formation including three modes:Bedding karst,Broken solution system and Intrusive vein induced fracture mode.(4)The source storage docking type and the source storage cover type is the main type of Buried hill hydrocarbon accumulation pattern,lacking regional weathering crust long-distance transport mode,the granite buried hill slope slope sediments could lateral conducting oil and gas.