一种使用岩电资料确定束缚水饱和度及其他参数的方法  

A method for determining irreducible water saturation and other parameters using core electricity data

作　　者：杨克兵 张磊[1] 吴晓宁 苑国辉 王慧婧 郭西波 YANG Kebing;ZHANG Lei;WU Xiaoning;YUAN Guohui;WANG Huijing;GUO Xibo(PetroChina Huabei Oilfield Company,Renqiu 062552,China)

机构地区：[1]中国石油华北油田分公司,河北任丘062552

出　　处：《复杂油气藏》2021年第2期47-51,共5页Complex Hydrocarbon Reservoirs

摘　　要：通过对单块岩电实验资料分析,岩心实验测量的电阻率与含水饱和度数据为幂函数关系。由于测量过程中使用高压气体对孔隙可动水进行驱替,这些测量数据能够反映岩石的孔隙水导电特征。进一步研究表明,当幂函数的电阻率曲线呈平缓变化趋势时,是可动水孔隙的变化影响电阻率曲线;当电阻率曲线呈剧烈变化趋势时,是束缚水孔隙导电起主导作用。因此可从曲线的形态变化确定束缚水饱和度、可动油饱和度、残余油饱和度等参数,就如同确定岩石孔隙度下限一样。与压汞等资料得出的束缚水饱和度资料对比,采用幂函数曲线的斜率截止法可确定岩心的束缚水饱和度,采用曲率最大值法可确定可动油饱和度,二者之间为残余油。初步应用表明,所确定的束缚水饱和度等参数绝对误差在5%以内,能够在实际中推广使用。Based on the analysis of rock electricity data,the electrical resistivity and water saturation data measured by core experiments have a power function relationship.During the measurement process,high-pressure gas was used to displace the movable water in the pores.Thus,these measurement data can reflect the conductivity characteristics of water in rock pores.Further research showed that when the resistivity curve of the power function shows a gentle change trend,the change of the movable water pores affects the resistivity curve;when the resistivity curve shows a drastic change trend,the conductivity of the irreducible water pores plays a leading role.Therefore,parameters such as irreducible water saturation,movable oil saturation,residual oil saturation,etc.can be determined from the shape change of the curve,just like determining the lower limit of rock porosity.Compared with the irreducible water saturation data obtained by mercury injection data,the slope cut-off method of the power function curve can be used to determine the irreducible water saturation of the core,and the curvature maximum method can be used to determine the movable oil saturation,with residual oil saturation in between.The preliminary application showed that the absolute error of determining irreducible water saturation and other parameters is within 5%,which can be used in practice.

关 键 词：岩电实验 数据分析 幂函数 束缚水饱和度 可动油饱和度 残余油饱和度 

分 类 号：TE321[石油与天然气工程—油气田开发工程]