中上扬子区海相页岩复电阻率响应特征及总有机碳含量预测  

Complex resistivity response characteristics and TOC prediction of marine shale in the Middle and Upper Yangtze region

作　　者：向葵[1] 严良俊[1] 石艳玲 胡祖志[2] 余刚[2] XIANG Kui;YAN LiangJun;SHI YanLing;HU ZuZhi;YU Gang(Key Laboratory of Exploration Technologies for Oil and Gas Resources at Yangtze University,Ministry of Education,Wuhan 430100,China;Bureau of Geophysical Prospecting,China National Petroleum Corporation,Zhuozhou Hebei 072751,China)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),武汉430100 [2]中国石油集团东方地球物理勘探有限责任公司,河北涿州072751

出　　处：《地球物理学报》2024年第11期4400-4416,共17页Chinese Journal of Geophysics

基　　金：国家自然科学基金重点项目(42030805);国家自然科学基金面上项目(42174083,42274087);国家自然科学青年基金项目(42204079)资助.

摘　　要：页岩的电性响应特征是评价页岩气储层总有机碳含量(TOC)的重要技术指标,而现有的TOC评价模型仅利用电阻率一个电性参数,不能满足储层评价的需要,复电阻率为此提供了新途径. 本文采用实验分析和理论建模的方法,以中上扬子区海相页岩为研究对象,通过对不同地区、不同地层及页岩气井的页岩进行复电阻率实验与模型研究,反演提取页岩的激发极化(IP)参数,揭示页岩有机质富集与复电阻率响应的内在联系及规律. 结合TOC测试结果,建立电阻率、极化率与TOC评价关系模型,发掘有利于页岩气储层评价的电性敏感参数,并应用于实际勘探试验区的储层TOC预测. 形成了一套以复电阻率参数测试为主的页岩储层岩石物性测试与分析的方法和技术,为应用电磁勘探方法进行页岩气储层TOC评价提供了理论基础和物性数据.The electrical response of shale is an important technical index for evaluating the total organic carbon content (TOC) of shale gas reservoirs. However, resistivity is the only electrical parameter available to evaluation models of TOC, which can't meet the needs of reservoir evaluation. Complex resistivity provides a new way to solve this problem. Using experimental analysis and theoretical modeling methods, this study performed complex resistivity experiments and model study of the shale samples from different regions and formations in the Middle and Upper Yangtze region, extracted induced polarization (IP) parameters of shale, and then established the intrinsic relationship and rule between organic matter enrichment and complex resistivity response. Furthermore, based on the test results of TOC, the relationship model between resistivity, chargeability and TOC evaluation is established, and the sensitive parameters conducive to the evaluation of shale gas reservoir are explored and applied to the prediction of TOC in the actual exploration test area. A set of methods and techniques for rock physical property testing and analysis of shale reservoirs, mainly based on complex resistivity parameter testing, are formed, which provides the theoretical basis and physical property data for using the electromagnetic exploration method to do TOC evaluation of shale gas reservoirs.

关 键 词：页岩 复电阻率 总有机碳含量 极化率 储层预测 

分 类 号：P631[天文地球—地质矿产勘探]