Determination of the lower limit of physical properties for effective tight oil reservoirs:a case study of Es33 Ⅴ oil formation in Block G of Gaoshangpu Oilfield
The lower limit of effective reservoir physical properties is an important parameter for dividing res-ervoirs,determining effective thickness and calculating reserves.The Es33 Ⅴ oil formation in Block G of Gaoshangpu Oilfield is a near source quasi continuous tight sandstone reservoir.The uncertainty of reservoir parameters brings difficulties for subsequent development and the application of drilling and production tech-nology.Based on core analysis and production testing data,five methods were adopted,including oil bear-ing occurrence,empirical statistics,pore permeability relationship,minimum flow pore throat radius,and mercury injection parameter methods.Through the verification of phase permeability experiments and oil tes-ting and production,the lower limit of porosity and permeability in the area were determined to be 7.7％and 0.16×10-3 μm2.The research results can provide a basis for the production capacity calculation,res-ervoir evaluation,and development selection of tight oil reservoirs in Gaoshangpu Oilfield.
tight sandstonelower limit of physical propertyeffective reservoirmercury penetrationphase permeability experiment
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