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

Abstract

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

CLC Number:

P631.2

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

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