Lithofacies of the Shales in the Second Member of Funing Formation in Gaoyou Sag, Subei Basin and Their Depositional Environment

CHEN Guo; FU Qiang; YU Wenquan; YANG Baoliang; XING Lele; ZHU Zhiwei

doi:10.16562/j.cnki.0256-1492.2024102401

Marine Geology & Quaternary Geology > 2025 > Corrected proof > DOI: 10.16562/j.cnki.0256-1492.2024102401

CHEN Guo，FU Qiang，YU Wenquan，et al. Lithofacies of the Shales in the Second Member of Funing Formation in Gaoyou Sag, Subei Basin and Their Depositional Environment[J]. Marine Geology & Quaternary Geology，xxxx，x(x)： x-xx. DOI: 10.16562/j.cnki.0256-1492.2024102401

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Lithofacies of the Shales in the Second Member of Funing Formation in Gaoyou Sag, Subei Basin and Their Depositional Environment

1.
State key laboratory of marine geology Tongji University, Shanghai 200092, China
2.
Exploration and Development Research Institute Jiangsu Oilfield SINOPEC, Yangzhou 225009, China

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Received Date: October 23, 2024
Revised Date: December 22, 2024
Accepted Date: December 22, 2024
Available Online: March 12, 2025

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Abstract

Abstract

Shales of the Second Member of Funing Formation (E₁f₂, the Paleogene) in the Gaoyou Sag, Subei Basin, Jiangsu, East China, have been proved to have commercial shale oil flow. Analysis on the core of the HY1 well showed that the shales are mainly felsic-calcilutite/dolomitic, felsic-argillaceous, or argillaceous felsic, which constitutes the laminated felsic-argillaceous mixed facies and felsic-calcilutite/dolomitic mixed rocks facies. The analyses of major and trace elements showed that the shale lithofacies is mainly controlled by the paleosalinity, paleoclimate, and paleowater depth. According to the sedimentary paleoenvironmental reconstruction and the analyses of the development of rock facies, the felsic-argillaceous mixed rocks facies were formed in deep-water humid and low-salinity depositional environment; the laminated felsic-argillaceous mixed rocks facies and felsic-calcilutite/dolomitic mixed rocks facies reflected the semi-deep-water and semi-saline-water relatⅣely humid environment; and the laminated felsic-calcilutite/dolomitic mixed rocks facies were deposited in a shallow-water arid and high-salinity depositional environment. The research results are of great scientific significance to the analysis of shale facies distribution and prediction of shale reservoir “sweet spot”.
- palaeoenvironment,
- shale lithofacies,
- Funing Formation,
- Gaoyou Sag,
- Subei Basin

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Lithofacies of the Shales in the Second Member of Funing Formation in Gaoyou Sag, Subei Basin and Their Depositional Environment