Microscopic characteristics and enrichment mechanisms of organic matter in the second member of Funing Formation shale in the Gaoyou Sag, Subei Basin, China
Received date: 2024-06-07
Revised date: 2024-08-22
Online published: 2024-10-09
Supported by
The Open Fund of Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education(K202307)
the National Natural Science Foundation of China(42272160)
The shale in the second member of Funing Formation (E1 f 2) from the Gaoyou Sag, Subei Basin has demonstrated significant industrial oil and gas production. The composition and enrichment of organic matter (OM) in the shale play a crucial role in hydrocarbon generation, highlighting the importance of studying its OM characteristics and enrichment mechanisms. This study investigates Well H1 in the Gaoyou Sag, employing organic petrology, X-ray diffraction (XRD), and organic-inorganic geochemical analyses to systematically investigate the microscopic characteristics of OM, depositional environment, and the main controlling factors of OM enrichment in the E1 f 2 shale, and ultimately reveal its enrichment model. The results show that: (1) The E1 f 2 shale can be classified into three types:Felsic shale, hybrid shale, and calcareous shale, with significant differences in microscopic components. The hybrid shale exhibits a wide range of alginite content (40%-95%) with an average of 72.94%, forming laminar algal with a thickness of over 30 μm and a length of up to 200 μm; (2) The E1 f 2 shale was primarily deposited in an arid climate and high-salinity, anoxic environment, with OM mainly derived from low-level aquatic organisms, predominantly Type I and Type II1 kerogen, reaching the peak oil generation stage of maturity, which is favorable for shale oil formation; (3)The OM enrichment in the E1 f 2 shale is mainly controlled by paleoproductivity and paleosalinity, with preservation conditions having a relatively minor influence. This study provides essential insights for further shale oil exploration and development within OM-lean shale in the Gaoyou Sag, as well as similar areas.
Ya ZHAO , Taohua HE , Qianghao ZENG , Zhigang WEN , Juan TENG , Yongfeng QIU , Daxin XIAO , Jiayi HE , Kaiwen XUE . Microscopic characteristics and enrichment mechanisms of organic matter in the second member of Funing Formation shale in the Gaoyou Sag, Subei Basin, China[J]. Natural Gas Geoscience, 2025 , 36(4) : 734 -748 . DOI: 10.11764/j.issn.1672-1926.2024.08.013
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