基于岩相多样性的海相页岩储层品质差异化特征及成因模式研究

The development of different lithofacies reservoir characteristics of marine shale has important influence on the accumulation and exploitation, so classifying the lithofacies, characterizing its different reservoir quality and figuring out the genetic mechanism of differentiation in the marine shale not only relates to the geologic theory research of organic shale deposition mechanism and shale gas enrichment regularity, but also has important application significance for the geologic evaluation and production of marine shale gas in southern China. In this study,we take the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation marine shale, in Jiaoshiba Area, as the study target to reveal the difference mechanism of different lithofacies’ reservoir quality of marine shale. Based on the detailed description of cores, FE-SEM、QEMSCAN，isothermal adsorption experiment and nanoscale tracer analysis, we will propose lithofacies classification scheme combining geological theory and production experience, distinguish the reservoir characteristics of different lithofacies, reveal its genetic mechanism and establish the genetic model of reservoir quality differentiation of marine shale based on lithofacies diversity. The results of this study have an instruction significance for marine shale gas exploration.

海相页岩不同岩相储层品质的发育对页岩气的富集和开采具有重要影响，深入开展海相页岩岩相发育特征研究，阐明不同岩相储层品质差异化特征发育规律及成因机理，不仅关系到富有机质页岩沉积机理和页岩气富集规律等地质理论研究问题，而且对我国南方海相页岩气选区评价和生产开发具有重要的应用指导意义。本项目以四川盆地涪陵焦石坝探区上奥陶统五峰组-下志留统龙马溪组海相页岩为研究对象，以揭示海相页岩不同岩相储层品质差异性成因机理为研究目标，基于岩芯观察，结合场发射环境扫描电镜、QEMSCAN分析、等温吸附试验、纳米级示踪剂等分析测试方法，提出兼具地质理论认识和生产开发经验的海相页岩岩相划分方案，明确不同岩相发育特征及沉积机理，精细刻画不同岩相储层品质差异化特征并揭示其成因机理，建立基于岩相多样性的海相页岩储层品质差异化成因模式，为我国海相页岩气勘探开发提供借鉴参考。

海相页岩不同岩相储层品质的发育对页岩气的富集和开采具有重要影响，深入开展海相页岩岩相发育特征研究，阐明不同岩相储层品质差异化特征发育规律及成因机理，不仅关系到富有机质页岩沉积机理和页岩气富集规律等地质理论研究问题，而且对我国南方海相页岩气选区评价和生产开发具有重要的应用指导意义。本项目以四川盆地涪陵焦石坝探区上奥陶统五峰组-下志留统龙马溪组海相页岩为研究对象，以揭示海相页岩不同岩相储层品质差异性成因机理为研究目标，基于岩芯观察，结合场发射环境扫描电镜、QEMSCAN分析、等温吸附试验、纳米级示踪剂等分析测试方法，提出兼具地质理论认识和生产开发经验的海相页岩岩相划分方案，明确不同岩相发育特征及沉积机理，精细刻画不同岩相储层品质差异化特征并揭示其成因机理，建立基于岩相多样性的海相页岩储层品质差异化成因模式，为我国海相页岩气勘探开发提供借鉴参考。