石油勘探与开发2026，Vol.53Issue(4)：826-838,13.DOI:10.11698/PED.20250584
超深层页岩烃类微运移特征与成藏模式
Hydrocarbon micro-migration characteristics and accumulation model of ultra-deep shale:A case study of Permian Dalong Formation in Well Tiebei 1 L-HF in northeastern Sichuan Basin,SW China
摘要
Abstract
The hydrocarbon accumulation patterns of ultra-deep,marine shale in the northeastern Sichuan Basin remain unclear.Taking the Permian Dalong Formation in Well Tiebei 1 L-HF in the Puguang area,northeastern Sichuan Basin,as an example,this study integrated petro-mineralogical,geochemical,and micro-scale characterization techniques to systematically reveal the enrichment mechanisms of primary organic matter and the reservoir-forming conditions of shale and establish the hydrocarbon micro-migration and accumulation model.The main findings are obtained in three aspects.First,three core lithofacies,i.e.siliceous,calcareous and mixed shales,are identified vertically in the Dalong Formation.Siliceous shale,dominated by sapropelinite,possesses the optimal primary hydrocarbon-generating potential.Mixed shale exhibits the TOC(average 9.31％)exceeding that of the siliceous shale(average 6.85％),indicating that the current organic matter distribution is controlled by late-stage hydrocarbon redistribution rather than solely by primary deposition.Second,a multi-scale cross-lithofacies composite pore-fracture system is identified.Siliceous shale provides basic storage space of hydrocarbon and horizontal transport;calcareous shale contains fractures in calcite veins,which act as migration"transfer stations"of hydrocarbon;and mixed shale develops tectonic tensile fractures and dissolution pores.Together,these elements support fluid conduction in ultra-deep settings.Third,the micro-migration mechanism of"in-source enrichment and lithofacies-controlled migration"is confirmed for ultra-deep shale hydrocarbons.Within an overpressure compartment,driven by hydrocarbon generation-induced overpressure,hydrocarbons undergo stepwise micro-migration along the siliceous shale(source)→ calcareous shale(conduit)→ mixed shale(sink)path,inducing short-distance fractionation and redistribution of components.关键词
四川盆地/川东北/普光地区/二叠系大隆组/超深层页岩/微运移/甜点预测/铁北1侧HF井Key words
Sichuan Basin/northeastern Sichuan Basin/Puguang area/Permian Dalong Formation/ultra-deep shale/micro-migration/sweet spot prediction/Well Tiebei 1 L-HF分类
能源科技引用本文复制引用
段金宝,徐田武,周凯,李卓,高之业,黄蕾..超深层页岩烃类微运移特征与成藏模式[J].石油勘探与开发,2026,53(4):826-838,13.基金项目
国家自然科学基金联合基金石油化工重大专项"四川盆地及周缘二叠系页岩气差异富集机理与分布规律"(U25D9024) （U25D9024）
