Geochemical characteristics and hydrocarbon generation potential of Eocene oil shale in Songxi Sag, Qiongdongnan Basin

WANG Ziling; SONG Ruiyou; DENG Xiaoliang; HE Liwen; LEI Mingzhu

doi:10.12097/gbc.2023.09.035

2025 Vol. 44, No. 2~3

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Article navigation > Geological Bulletin of China > 2025 > 44(2~3): 220-231

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WANG Ziling, SONG Ruiyou, DENG Xiaoliang, HE Liwen, LEI Mingzhu. 2025. Geochemical characteristics and hydrocarbon generation potential of Eocene oil shale in Songxi Sag, Qiongdongnan Basin. Geological Bulletin of China, 44(2~3): 220-231. doi: 10.12097/gbc.2023.09.035

Citation:

WANG Ziling, SONG Ruiyou, DENG Xiaoliang, HE Liwen, LEI Mingzhu. 2025. Geochemical characteristics and hydrocarbon generation potential of Eocene oil shale in Songxi Sag, Qiongdongnan Basin. Geological Bulletin of China, 44(2~3): 220-231. doi: 10.12097/gbc.2023.09.035

Geochemical characteristics and hydrocarbon generation potential of Eocene oil shale in Songxi Sag, Qiongdongnan Basin

CNOOC China Limited, Hainan Branch, Haikou 570100, Hainan, China

Received Date: 28 September 2023

Revised Date: 26 March 2024

Publish Date: 15 March 2025

Abstract

Abstract

Objective
Recently, a set of thick Eocene oil shale was drilled in Songxi Sag, which is the first time the oil shale was drilled in Qiongdongnan Basin. In order to implement the hydrocarbon generation potential of the Eocene oil shale and promote further exploration in songxi sag, Qiongdongnan Basin.
Methods
this article is based on drilling records, elemental assays and a series of geochemical tests to study the characteristics and formation environment of oil shale and predict the resource potential of this oil shale.
Results
The analysis results show that the average Total Organic Carbon (TOC) of this set of oil shale was 3.33%, the average pyrolysis hydrocarbon potential (S₁+S₂) was 22.2 mg/g, and the average Hydrogen Index (HI) was 606 mg/g TOC. The sedimentary environment of this oil shale is a warm semi−humid reduced freshwater lake environment, which has the characteristics of mixed input of lower aquatic organisms and higher terrestrial plants.
Conclusions
It shows that the oil shale has high organic matter abundance, good type and high paleoproductivity, which is a good to high−quality source rock. Its crude oil resources are about 41.4 million tons, with huge potential for crude oil resources.Both conventional oil and gas and shale oil have great exploration potential.
- oil shale /
- hydrocarbon generation potential /
- biomarker /
- Songxi Sag /
- Qiongdongnan Basin

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References

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