利用数字岩心技术评价含黏土砂岩导电模型  

Evaluate Electrical Conductivity Models of Clay-Bearing Sandstones by Digital Core Technology

作　　者：范雨霏[1] 潘保芝[1] 郭宇航[1] 张丽华[1] Fan Yufei;Pan Baozhi;Guo Yuhang;Zhang Lihua(College of Geo Exploration Scienceand Technology,Jilin University,Changchun 130026,China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2021年第3期919-926,共8页Journal of Jilin University：Earth Science Edition

基　　金：吉林省科技发展计划(20170201001SF);吉林省科技发展计划优秀青年人才项目(20190103150JH)。

摘　　要：黏土附加导电性使得岩石导电机理复杂化,影响了测井解释中饱和度计算的准确性。随着石油勘探的发展,测井解释研究者针对特定地区和储层条件的饱和度求解提出了多种导电模型。本文基于贝雷砂岩的数字岩心,构建多种含黏土的砂岩数字岩心,利用有限元方法模拟岩心饱和水时的电导率C0,并将数值模拟C0与5种模型计算C0对比,分析各种导电模型的适用情况。结果表明,黏土体积分数越小,黏土的阳离子交换容量越小,岩石孔隙度越大,公式计算C0越接近数值模拟C0。Doll公式和Indonesia公式计算C0与数值模拟C0接近,基本适用于不同孔隙度、黏土体积分数和阳离子交换容量的情况。The additional conductivity of clay complicates the mechanism of rock conductivity and affects the accuracy of saturation calculation in logging interpretation. With the development of petroleum exploration, logging interpretation researchers proposed many kinds of conductive models for the saturation calculation of specific areas and reservoir conditions. Based on the three-dimensional digital core of Berea sandstone, a series of digital cores of clay-bearing sandstones were constructed. The finite-element method was used to simulate the electrical characteristics of the cores saturated with brine. We compared the numerical simulation C0 with the calculation C0 of five models to analyze the applicability of these conductive models. The results show that with the decrease of clay content and clay cation exchange capacity and the increase of rock porosity, the model calculation C0 is closer to the numerical simulation C0. The Doll formula and Indonesia formula are closer to the numerical simulation results, and are basically applicable to different porosity, clay volume, and cation exchange capacity.

关 键 词：含黏土砂岩 电导率 有限元方法 数字岩心 导电模型 

分 类 号：P631.2[天文地球—地质矿产勘探]