Unconventional Petroleum Sedimentology: A Key to Understanding Unconventional Hydrocarbon Accumulation

作者：Caineng Zou, Zhen Qiu, Jiaqiang Zhang, Zhiyang Li, Hengye Wei, Bei Liu, Jianhua Zhao, Yang Tian, Shifa Zhu, Huifei Tao, Feng‐Yuan Zhang, Yuman Wang, Qin Zhang, Wen Liu, Hanlin Liu, Ziqing Feng, Dan Liu, Jinliang Gao, Rong Liu, Yifan Li · 发表于：Engineering · 年份：2022 · DOI：10.1016/j.eng.2022.06.016 · 被引用次数：105 · 研究领域：Hydrocarbon exploration and reservoir analysis、Geological Studies and Exploration、Methane Hydrates and Related Phenomena

The commercial exploitation of unconventional petroleum resources (e.g., shale oil/gas and tight oil/gas) has drastically changed the global energy structure within the past two decades. Sweet-spot intervals (areas), the most prolific unconventional hydrocarbon resources, generally consist of extraordinarily high organic matter (EHOM) deposits or closely associated sandstones/carbonate rocks. The formation of sweet-spot intervals (areas) is fundamentally controlled by their depositional and subsequent diagenetic settings, which result from the coupled sedimentation of global or regional geological events, such as tectonic activity, sea level (lake level) fluctuations, climate change, bottom water anoxia, volcanic activity, biotic mass extinction or radiation, and gravity flows during a certain geological period. Black shales with EHOM content and their associated high-quality reservoir rocks deposited by the coupling of major geological events provide not only a prerequisite for massive hydrocarbon generation but also abundant hydrocarbon storage space. The Ordovician–Silurian Wufeng–Longmaxi shale of the Sichuan Basin, Devonian Marcellus shale of the Appalachian Basin, Devonian–Carboniferous Bakken Formation of the Williston Basin, and Triassic Yanchang Formation of the Ordos Basin are four typical unconventional hydrocarbon systems selected as case studies herein. In each case, the formation of sweet-spot intervals for unconventional hydrocarbon resources was controlled by ...