关键词: 胜坨油田, 三角洲储层, 渗流参数, 动态模型, 动力地质作用

Abstract: A delta reservoir of layer 83 in the second member of Shahejie Formation of the Paleogene in the second district of Shengtuo oilfield has developed for 36 years with water flooding.The varying laws and mechanism of the filterate parameters in the process of water flood development of this reservoir were studied by using the data of core analysis and filterate physical simulation.Three models for simulating three filterate parameters were established.The simulation results with the wettability model show that the rock wettability and hydrophilicity are enhanced and the specific surface of rock is depressed with the growing of the combined water cut.The simulation of the porous structure model shows that the radii of pores and throat are enlarged,the connectivity of the pores and the factors for controlling the flow property are improved with the increase of current ecovery and water cut of the oilfield.The model for relative permeability of oil and water shows that the average relative permeability of water phase in the remaining oil was decreasing graduslly.The cross point in normalized plots for relative permeability migrated to right,e.g.the water saturation at the cross point increased.Under the same water saturation,the relative permeability of oil phase increased,and the relative permeability of water phase decreased.The change of filterate parameters is due to the dynamical geology process resulted from the fluid in reservoir development.

Key words: Shengtuo Oilfield, delta reservoir, filterate parameters, dynamic model, dynamical geology process