油层水电阻率的研究及应用效果

Study on the Water Resistivity of Oil bearing Zone and Its Application Result.

李厚义，张志安，宋长伟，李刚．油层水电阻率的研究及应用效果．测井技术，１９９８，２２（４）：２９９～３０２陆相油藏形成过程中，油层在微孔隙中保留了其成岩时的原生水，即束缚水，水层则在渗流孔隙中含自由水。油层中的束缚水与水层中的自由水可能具有不同的矿化度。对陆相沉积油藏而言，只有用束缚水电阻率求解油层的含水饱和度才是正确的。为此导出了束缚水电阻率模型及含水饱和度方程，说明各油田只要具备基本的地质分析资料都可以求得适合本油田地质特点的饱和度方程，进而求取油和水的相对渗透率、产水率、残余油饱和度方程。给出了该方法在二连某油田的应用效果。

In the formation of continental reservoir, diagenetic connate water, i.e. irreducible water, is retained in the micropores of the oil bearing zone and free water is contained in the seeping pores of the water zone.Irreducible water in the oil zone and free water in the water zone may have different salinity. For the reservoir from continental sedimentation water saturation of the oil bearing zone should be derived from irreducible water resistivity. The model for irreducible water resistivity and water saturation equation are given in this paper. It is illustrated that the saturation equation adaptable to the geology characteristic of the respective oil fields can be derived whenever the basic geology data is available .Thus oil relative permeability, water relative permeability, aquifer yield and irreducible oil saturation can be further derived. The application result of the concept mentioned above in Erlian Oil Field is given.