宝浪油田三工河组储层相对渗透率曲线异常原因分析

宝浪油田属于低孔低渗和低孔特低渗碎屑岩油藏,储层整体物性差,三工河组部分储层岩石的相对渗透率曲线出现当含水饱和度大于60%后,随着含水饱和度的增加,水相渗透率降低的异常现象。为了解释这种异常现象,通过室内评价试验以及储层矿物组成分析,认为相对渗透率曲线异常现象是由于储层岩屑和水敏性矿物含量高,水敏现象严重,从而导致相对渗透率曲线异常。

Analysis on Abnormal Relative Permeability Curve of Reservoirs in Sangonghe Formation of Baolang Oilfield

Baolang Oilfield belonged to a clastic reservoir with low porosity and permeability and extra-low porosity and permeability,where overall reservoir physical property was poor.For some of reservoir rocks in Sangonghe Formation,aqueous permeability decreased in permeability curve with the increase of water saturation as it was higher than 60%.In order to explain the abnormal phenomenon,mineral composition is evaluated and test in laboratory,it is considered that the abnormal phenomenon is caused by rock cuttings and high sensitive mineral content and severe water sensitivity,thus an abnormal relative permeability curve is induced.