Study Of Sedimentary Facies And Reservoir Type In The Third And Fourth Member Of Shahejie Formation In The South Of Binnan Oil Field

This thesis is on the instruction of reservoir sedimentology, petroleum geology and hydrocarbon accumulation dynamics. Setting up the rearch of sedimentary system and classify of profitable facies belt in the third and fourth member of Shahejie formation in the south of Binnan Oil Field using geology, geochemistry, geophysics and analyzed assay datum. Establishing the sedimentary facies type and it's distribution pattern, and sedimentary evolution mode. Evaluate each facies belts of different sedimentary facies comprehensively.According to the detailed observation and description of core, progress the synthesized analysis by combinbing the well logging, data of areal geology and all kinds of analyzed assay datum, assured the distribution regular pattern of sedimentary system in this area. Braided fan, transgressive fan delta, beach bar, lacustrine organic reef, gravity fluid, near-shore subaqueous fan and resgressive fan delta sedimentation types are identified, and bring forward the new sedimentary mode and sedimentary evolution regular. The climate was heat and arid in the red lower fourth member of Shahejie formation, and braided fan sedimentary system develops in this period. With climate regularly changing wet and lacustrine water coverage expanding broad in the blue-grey lower fourth member of Shahejie formation, transgressive fan delta and beach bar is the major sedimentation type. In the chun-low fourth member of Shahejie formation transgressive fan delta developed in the southern steep slope of Binxian salient, beach bar and lucastrine organic reef developed in the western near-shore and subaqueous uplift zone. Transgressive fan delta, beach bar was the main sedimentary facies in the chun-high fourth member of Shahejie formation, gravity fluid and slump turbidite fan developed in the east zone near Chenjiazhuang salient. Subaqueous near-shore fan, slump turbidite fan and small transgressive fan delta developed in the lower member of Shahejie formation. With lake level descended in the middle member of Shahejie formation resgressive fan delta developed. Resgressive fan delta and slump turbidite fan developed in the higher member of Shahejie formation.The reservoir types in the third and fourth member of Shahejie formation in the south of Binnan Oil Field are studied based on the analytical data from the laboratory, and the relation between facies belts and reservoir characters of different sedimentary facies are analyzed. The reservoir of different facies belt is evaluated. The result shows that the reservoir quality of underwater braided channel and mid-fan front of mid-fan, underwater braided channel and mouth bar of fan delta front, underwater braided channel of middle-fan is well. The reservoir quality of braided channel of fan root, braided channel of inner fan, sandy bar and part of slump turbidite fan takes second place. The reservoir quality of inter-channel channel, sheet sand of prodelta, thin sand of end-fan, sandy beach and most slump turbidite fan is bad.