确定油水同层原始含油饱和度的新方法

A New Method to Determine Original Oil Saturation in Oil-water Layer

G油田P油层是主要受岩性控制的构造-岩性油藏,油水同层比较发育。该区油水同层与油层的物性、电性相近,应用电阻率和孔隙度计算原始含油饱和度的常规方法不适用。以测井理论为基础,依据密闭取心井资料建立油层的原始含油饱和度解释模型,并采用相渗分析技术对油层的含油饱和度模型进行校正,实现了油水同层的原始含油饱和度的准确计算,为确定复杂油水同层的原始含油饱和度提供了新的方法。

P layer in G oilfield is a structural-lithologic reservoir controlled chiefly by lithology with many oil-water layers. Because the oil-water area is characterized by similar physical and electrical property with oil layer, the conventional method to calculate original oil saturation by resistivity and porosity is not fit for the oil-water layer in the G oilfield. Based on the logging theory, established is original oil saturation model in oil layer by sealing core data. And through relative permeability analysis technology, revised are the oil saturation calculation models in the oil layer. The original oil saturation is calculated correctly in the oil-water layer. Provided is a new method to determine original oil saturation in complex oil-water layer.