测井技术2025，Vol.49Issue(5)：653-666,14.DOI:10.16489/j.issn.1004-1338.2025.05.001
低电阻率页岩气储层成因及饱和度评价方法研究进展
Research Progress on Genesis and Saturation Evaluation Methods of Low-Resistivity Shale Gas Reservoir
摘要
Abstract
The significant heterogeneity in gas content of low-resistivity shale has gradually garnered widespread attention within the petroleum industry.Therefore,clarifying its key genetic mechanisms and establishing adapted saturation evaluation methods can provide essential technical support for the risk exploration and development of low-resistivity shale gas.This study takes the low-resistivity shale gas in the Sichuan basin as its research focus.Based on a comprehensive review of extensive relevant literature and a summary of its exploration and development status,it clarifies the regional and stratigraphic distribution characteristics of low-resistivity shale,its genetic mechanisms,and three mainstream saturation evaluation methods.Furthermore,it proposes a technical outlook for the log evaluation of low-resistivity shale gas.Major research advances include:①Spatially,low-resistivity shale gas reservoirs in the Sichuan basin are primarily distributed in the Changning,Luzhou,and western Chongqing areas;vertically,they are concentrated in the Lower Cambrian Qiongzhusi formation(Niutitang formation)and the Upper Ordovician Wufeng formation to Lower Silurian Longmaxi formation.②The formation of low-resistivity shale gas reservoirs results from the synergistic effects of multiple factors,including clay minerals,pyrite,thermal evolution of organic matter,pore water,and fractures.Among these,intense organic matter graphitization and high water saturation are the core controlling factors leading to the ultra-low resistivity(<5.0 Ω·m)characteristics of shale gas reservoirs in the southern Sichuan region.③The evaluation methods for saturation in low-resistivity shale gas reservoirs primarily include resistivity methods,non-resistivity methods,and machine learning methods.Among these,improved electrical saturation equations that incorporate the causes of low resistivity,along with saturation evaluation models constructed based on machine learning algorithms,have,to some extent,resolved the calculation deviations in free gas content caused by insufficient accuracy in saturation assessment.④For high-to-over-mature low-resistivity shale gas reservoirs,the key future research directions in logging study include:clarifying the resistivity-maturity relationship and reservoir classification criteria,revealing the adsorbed gas occurrence mechanisms and optimizing adsorption gas calculation models,characterizing planar gas distribution patterns based on multi-well gas content evaluation,and developing new gas saturation assessment technologies such as 2D NMR and array acoustic logging.关键词
四川盆地/低阻页岩气储层/有机质石墨化/含气饱和度/过成熟页岩/饱和度评价Key words
Sichuan basin/low-resistivity shale gas reservoir/organic matter graphitization/gas saturation/over-mature shale/saturation evaluation引用本文复制引用
张丽丽,闫建平,黄莉莎,廖茂杰,邱小雪,杨杨,郭伟,黄毅..低电阻率页岩气储层成因及饱和度评价方法研究进展[J].测井技术,2025,49(5):653-666,14.基金项目
国家自然科学基金项目"低电阻率页岩气储层:成因机制差异及含气饱和度模型研究"(42372177) （42372177）
中国石油-西南石油大学创新联合体科技合作项目"川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究"(2020CX020000) （2020CX020000）
四川省自然科学基金项目"页岩气储层低电阻率成因机制及对含气性的影响研究"(2022NSFSC0287) （2022NSFSC0287）
西南石油大学省级创新训练项目"深层页岩气地层成岩相类型、特征及测井定量评价方法"(S202410615116) （S202410615116）
