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A油田F油层属于低孔低渗砂岩储层,孔隙结构复杂、非均质性强,造成了原始含油饱和度解释的困难,解释精度普遍不高。为了解决这个问题,本文采用了两种方法。第一种方法:在蒸发率实验的基础上,利用密闭取心资料确定原始含油饱和度;第二种方法:用压汞资料求取最小孔喉半径,进而确定原始含油饱和度。其中,第二种方法为在研究区块没有密闭取心井的情况下,精确解释原始含油饱和度提供了新的途径。
Oilfield F is a low-porosity and low-permeability sandstone reservoir with complicated pore structure and strong heterogeneity, which makes it difficult to explain the original oil saturation. The interpretation accuracy is generally not high. In order to solve this problem, this article uses two methods. The first method uses the closed coring data to determine the original oil saturation based on the experiment of evaporation rate. The second method uses the mercury intrusion data to determine the minimum pore throat radius and then determines the original oil saturation. Among them, the second method provides a new way to accurately explain the original oil saturation without studying a closed coring well in the study block.