Paleo-marine redox conditions and development model of high-quality source rocks of the Early Silurian on the West side of Kangdian Oldland: a case study of CYD2 well in Yanyuan area

CHENG Jinxiang; DENG Min; WANG Zhenghe; YU Qian; ZHANG Haiquan; LIU Wei; ZHAO Ankun; YANG Guilai

doi:10.12097/j.issn.1671-2552.2022.10.010

2022 Vol. 41, No. 10

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CHENG Jinxiang, DENG Min, WANG Zhenghe, YU Qian, ZHANG Haiquan, LIU Wei, ZHAO Ankun, YANG Guilai. Paleo-marine redox conditions and development model of high-quality source rocks of the Early Silurian on the West side of Kangdian Oldland: a case study of CYD2 well in Yanyuan area[J]. Geological Bulletin of China, 2022, 41(10): 1813-1828. doi: 10.12097/j.issn.1671-2552.2022.10.010

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CHENG Jinxiang, DENG Min, WANG Zhenghe, YU Qian, ZHANG Haiquan, LIU Wei, ZHAO Ankun, YANG Guilai. Paleo-marine redox conditions and development model of high-quality source rocks of the Early Silurian on the West side of Kangdian Oldland: a case study of CYD2 well in Yanyuan area[J]. Geological Bulletin of China, 2022, 41(10): 1813-1828. doi: 10.12097/j.issn.1671-2552.2022.10.010

Paleo-marine redox conditions and development model of high-quality source rocks of the Early Silurian on the West side of Kangdian Oldland: a case study of CYD2 well in Yanyuan area

1.
Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China
2.
Key Laboratory of Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu 610081, Sichuan, China

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Corresponding author: DENG Min, dengmin911@126.com

Received Date: 01 August 2020

Revised Date: 20 October 2020

Publish Date: 15 October 2022

Abstract

Abstract

Based on the systematic geological survey and sedimentology study of the Longmaxi Formation.in the large area of Yanyuan Basin and the detailed geochemical analysis on the core of CYD2 well drilled in its southern margin, an organic matter enrichment model of the Early Silurian Longmaxi Formation.is proposed.This model gives a good explanation for the mechanism of organic matter accumulation under several influences, and the well understanding of this mechanism will provide a good basis for further high-quality source rock evaluation of shale gas in this area.In this study, the influences including paleo-redox environment, paleo-hydrological conditions, hydrothermal influence, and the factors that affect organic matter enrichment are all discussed.The high-quality source rocks are developed at the bottom(L1~L3)of Longmaxi Formation.in Yanyuan area.It has undergone an evolutionary process from the vulcanization environment with high retention in the early stage(L1)to the open and oxidic environment in the late stage(L5).In the early Silurian, the ancient oceans were strongly influenced by hydrothermal activities evidenced by the obvious LREE enrichment, slight Ce loss and significant Eu enrichment.The early tectonic evolution of the Kangdian Oldland resulted in the intense hydrothermal activities and crustal differential uplifts.It controlled the Paleo-redox condition of seawater and the extend of basin limitation of Yanyuan area during the Early Silurian.The early tectonic evolution of the Kangdian Oldland, together with the continuous rise of sea level, controlled the distribution of ancient marine environment and high-quality source rocks during the Longmaxi period of Silurian in the Yanyuan area.
- high-quality source rocks /
- redox conditions /
- Silurian Longmaxi Formation /
- Yanyuan area

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References

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