复杂油藏原始含油饱和度计算方法

运用油藏工程方法及资料，针对传统的构造油藏，对利用压汞资料计算油藏原始含油饱和度的“油柱高度法”进行了方法改进。通过对油藏油水分布、油藏类型、成藏机理及区域地质规律综合研究，提出成藏时期存在“准油水界面”的观点。利用储层物性资料、相渗透率曲线、毛管压力曲线和试油成果证实油水同层的产水率，并求出油藏的准油水界面，然后，用压汞和油藏资料制定的油层原始含油饱和度与油柱高度关系图，求出油藏各油层的含油饱和度。该方法在葡西地区的葡萄花油层进行实际应用，与密闭取心蒸馏法分析的原始含油饱和度数据对比，精度为93．6％，证实该方法是有效的。

The Method of Reservoir Engineering to Calculate the Original Oil Saturation of Complex Reservoir

This article uses method and data of petroleum reservoir engineering. Aim at the structural reservoir which fit in with the tradition, we improve the oil height method which is used to calculate the original oil saturation. By the comprehensive investigation of distribution of oil and water, types of reservoir,mechanism of reservoir forming, and regional geology regularity, we refer that there is a pseudo-surface between oil and water during the reservoir forming period,and by using the data of properties of reservoir,relative permeability curve,capillary force curve and oil testing result,we verify the pseudo-surface which is calculated by the water productivity of layer bearing both water and oil. Furthermore we also use the relationship map of original oil saturation and oil column height gotten by the intrusive mercury and data of reservoir to calculate the oil saturation of each oil bed.This method is practiced in Putaohua layer of western Putaohua reservoir,and our sealing core distillation analysis,the conformity is 93.6%, and so,improves that our method is effective.