测井技术2025，Vol.49Issue(3)：378-387,10.DOI:10.16489/j.issn.1004-1338.2025.03.006
鄂尔多斯盆地深部煤层复电阻率及岩电参数频散特征
Dispersion Characteristics of Complex Resistivity and Petroelectric Parameters of Deep Coal Seam in the Ordos Basin
摘要
Abstract
The complex pore structure,metamorphic degree and mineral components have a great impact on the electrical conductivity characteristics of deep coal seams,posing significant challenges to the evaluation of saturation based on electrical parameters.In order to clarify the electrical properties and core electrical parameters of deep coal seams,based on the samples of deep coal seam from the Benxi group in the Ordos basin,a series of supporting petrophysical experiments on complex resistivity under different test frequencies and different saturation states are carried out.A saturation correction model is established based on the difference between gas porosity and liquid porosity.Based on the difference between gas porosity and liquid porosity a saturation correction model is established.The relationship between the measured complex resistivity and saturation is fitted by power index to correct the complex resistivity of coal seam in complete water-bearing state,The frequency dispersion characteristics of complex resistivity of coal seam are analyzed,and the variation characteristics and physical mechanism of between core electrical parameters and water saturation,frequency are clarified.The results indicate that the complex resistivity,the resistivity index of coal seam is negatively correlated with water saturation and frequency,the saturation index is negatively correlated with the test frequency,while the cementation index is positively correlated with the test frequency.The calculation model of water saturation is established by the core electrical parameters corresponding to the frequency of 10 kHz,it is found that the calculated value is less than the measured value,and the average absolute error is 7.47%.For different resistivity logging methods and instruments,it is recommended to select appropriate core electrical data within the tested frequency band for saturation modeling.This study provides effective support for in-depth understanding of the electrical characteristics and saturation evaluation of deep coal seams.关键词
深部煤层/饱和度/复电阻率/岩电参数/频散特征Key words
deep coal seam/saturation/complex resistivity/core electrical parameter/dispersion characteristic分类
天文与地球科学引用本文复制引用
邓泽,赵群,范立勇,葛新民,黄道军,石磊,王子铭,张永昊..鄂尔多斯盆地深部煤层复电阻率及岩电参数频散特征[J].测井技术,2025,49(3):378-387,10.基金项目
国家自然科学基金项目"油基泥浆致密砂岩T1—T2—D三维核磁共振响应机理及应用研究"(42171442) （42171442）
中国石油天然气集团有限公司科技项目"煤岩气富集规律与开发机理研究"(2024DJ23) （2024DJ23）
中国石油天然气集团有限公司科技项目"深层煤层气成藏理论与效益开发技术研究"(2023ZZ18) （2023ZZ18）
中国石油勘探开发研究院开放基金项目"深部煤岩导电机理及含水饱和度评价方法"(2023-KFKT-40) （2023-KFKT-40）
中国石油长庆油田公司关键核心技术攻关项目"鄂尔多斯盆地深层煤岩气赋存机理、富集规律及有效提产关键技术攻关"(2023DZZ01) （2023DZZ01）
