测井技术2026，Vol.50Issue(2)：240-251,12.DOI:10.16489/j.issn.1004-1338.2026.02.004
多孔介质中的趋肤效应特性分析
Analysis of Skin-Oriented Effect Characteristics in Porous Media
摘要
Abstract
To clarify the regulatory mechanism of the skin effect in porous media under multiple influencing factors and address the resulting limitation on electromagnetic detection accuracy,a parametric digital rock model of porous media is developed using the COMSOL multiphysics simulation platform with its AC/DC module.This study systematically investigates the coupled influence of key factors such as porosity,water saturation,grain characteristics,electromagnetic parameters,and coil spacing on the apparent conductivity in induction logging.The validity of the research findings is confirmed through comparison with actual logging data from low-resistivity formations.The results indicate that:①In homogeneous formations,the skin effect is regulated by frequency and coil spacing;increasing either factor intensifies the effect,with the measurement range of the imaginary signal being more than three times larger than that of the real signal,and the real part approaching zero at the peak of the imaginary part.②The heterogeneous structure of porous media alters current paths and skin depth.A 10%increase in porosity expands the imaginary part of apparent conductivity by more than three times compared to the real part.Higher porosity,increased formation water salinity,or elevated water saturation exacerbates the skin effect.While the microstructure of grains affects response amplitude,it has no significant impact on the measurement range.③In low-resistivity reservoirs,the combination of high-salinity formation water and relatively high irreducible water saturation induces a strong skin effect,causing distortion and failure of the real signal.In contrast,the imaginary signal maintains an effective response across a wider measurement range.It is concluded that the skin effect in porous media is governed by the coupled interactions among pore structure,fluid distribution,and electromagnetic parameters.The imaginary signal effectively overcomes the measurement limitations of the real signal and enables accurate identification of oil,gas,and water layers in low-resistivity reservoirs.This study clarifies the regulatory mechanism of the skin effect in porous media,providing a robust theoretical foundation and practical reference for high-precision electromagnetic detection and log interpretation.关键词
趋肤效应/多孔介质/数字岩心模型/感应测井/视电导率/低阻储层/含水饱和度/孔隙度Key words
skin effect/porous media/digital core model/induction logging/apparent conductivity/low-resistivity reservoir/water saturation/porosity分类
天文与地球科学引用本文复制引用
仵杰,赵冰倩,白彦,田豆,刘硕..多孔介质中的趋肤效应特性分析[J].测井技术,2026,50(2):240-251,12.基金项目
国家自然科学基金项目"水平井随钻电阻率成像测井裂缝张开度计算方法研究"(42304138) （42304138）
陕西省自然科学基础研究项目"融合数字孪生的大斜度井/水平井动态建模与参数估计"(2024JC-YBMS-241) （2024JC-YBMS-241）
