利用数字岩心技术评价含黏土砂岩导电模型

doi:10.13278/j.cnki.jjuese.20200041

摘要/Abstract

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。

关键词: 含黏土砂岩, 电导率, 有限元方法, 数字岩心, 导电模型

Abstract: 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.

Key words: clay-bearing sandstones, electrical conductivity, finite-element method, digital core, conductivity model

中图分类号:

P631.2

范雨霏, 潘保芝, 郭宇航, 张丽华. 利用数字岩心技术评价含黏土砂岩导电模型[J]. 吉林大学学报(地球科学版), 2021, 51(3): 919-926.

Fan Yufei, Pan Baozhi, Guo Yuhang, Zhang Lihua. Evaluate Electrical Conductivity Models of Clay-Bearing Sandstones by Digital Core Technology[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(3): 919-926.

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