方解石润湿性对饱和度指数n的影响研究  

Study on the Influence of Wettability of Calcite on Saturation Index n

作　　者：张丽华[1] 李庆峰 单刚义[1] 李洪征 潘保芝[1] 许凤鸣 ZHANG Lihua;LI Qingfeng;SHAN Gangyi;LI Hongzheng;PAN Baozhi;XU Fengming(College of GeoExploration Science and Technology,Jilin University,Changchun,Jilin 130026,China;Daqing Branch,China National Logging Corporation,Daqing,Heilongjiang 163000,China;Exploration Division,PetroChina Daqing Oilfield,Daqing,Heilongjiang 163000,China)

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026 [2]中国石油集团测井有限公司大庆分公司,黑龙江大庆163000 [3]中国石油大庆油田勘探事业部,黑龙江大庆163000

出　　处：《测井技术》2023年第1期16-21,共6页Well Logging Technology

基　　金：国家自然科学基金面上项目“IFCD油页岩原位转化过程流-热-应力-化学耦合数值模拟研究”(NSFC42072323)。

摘　　要：饱和度指数是计算含水饱和度的一个重要参数,其微小变化会导致含水饱和度的明显变化。储层润湿性会影响孔隙空间流体分布的几何形状和连通性,继而影响岩石电阻率测量值,最终反映在阿尔奇公式的饱和度指数n上。为了解方解石的含量和润湿性对饱和度指数的影响,实验选取X地区Y油层4口井42块岩样进行全岩分析和岩电实验。实验结果表明:方解石的润湿性和含量影响饱和度指数,饱和度指数随着方解石含量增大而增大;方解石是油湿的,油湿储层的饱和度指数比水湿储层的饱和度指数大;在方解石含量较高的储层中,计算含水饱和度应充分考虑方解石润湿性带来的影响。Saturation index is an important parameter for calculating water saturation.Its small change can lead to obvious change of water saturation.Reservoir wettability will affect the geometry and connectivity of fluid distribution in pore space,and then affect the measured value of rock resistivity.This effect will be reflected in the saturation index n of Archie formula.In order to understand the influence of calcite content and wettability on saturation index,42 rock samples from 4 wells of Y oil layer in X area are selected for whole rock analysis and rock resistivity experiment.The experimental results show that the wettability and content of calcite affect the saturation index n,n increases with the increase of calcite content.Calcite is oil wet,the saturation index of oil wet reservoir is larger than that of water wet reservoir.In the reservoir with high calcite content,the influence of calcite wettability should be fully considered in calculating water saturation.

关 键 词：测井解释 方解石 润湿性 饱和度指数 阿尔奇公式 岩电实验 

分 类 号：P631.84[天文地球—地质矿产勘探]