摘要
以储层岩石串联毛管模型为基础,本文建立了一种考虑储层润湿性的毛管模型,并对含油储层岩石的激发极化特性进行了数值模拟。计算结果表明:储层润湿性对储层岩石的激发极化特性有重要影响。在相同含水饱和度条件下,水湿岩石的极化率大于油湿岩石的极化率;储层岩石越水湿,其激发极化效应越强。溶液浓度、孔隙度和阳离子交换量等储层物性参数的变化也会对激发极化效应产生影响;储层岩石的极化率随溶液浓度、孔隙度的增加而减小。当岩石亲油时,储层岩石的极化率随阳离子交换量的增加而增大,且变化幅度越来越小;当岩石亲水时,随着阳离子交换量的增加,储层岩石的极化率先急剧增大,后略有下降。
We establish in this paper a new capillary model with reservoir wettability based on the series capillary model,and simulate numerically the induced polarization effect of oil-bearing reservoir rocks.The results show that reservoir wettability has a significant influence on induced polarization effects of reservoir rocks.Polarizability of water-wet rocks is greater than that of oil-wet rocks under the same water saturation.The wetter the reservoir rock is,the stronger induced polarization effects it has.Reservoir physical parameter can affect the induced polarization effects of reservoir rocks as well,such as the solution concentration,the porosity and the cation exchange capacity,etc.The polarizability of oil-bearing reservoir rocks decreases with the increase in the porosity and the solution concentration.But it increases with the increase in the cation exchange capacity under the condition of oil wet,and it increases sharply at first and then decreases mildly under the condition of water wet.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2013年第3期467-473,506+331,共7页
Oil Geophysical Prospecting
基金
国家自然科学基金项目(40874064)资助
关键词
激发极化效应
毛管模型
极化率
润湿性
capillary model,induced polarization effect,polarizability,wettability
