Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation, Qinshui basin

LIU Yanhai; LI Kunjie; LIU Dongna; XUE Shubin; LIU Yangfei; CHU Yonghui

doi:10.3969/j.issn.1001-1986.2020.05.002

Volume 48 Issue 5

Oct. 2020

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COAL GEOLOGY & EXPLORATION > 2020 > 48(5): 16-25. > DOI: 10.3969/j.issn.1001-1986.2020.05.002

LIU Yanhai, LI Kunjie, LIU Dongna, XUE Shubin, LIU Yangfei, CHU Yonghui. Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation, Qinshui basin[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(5): 16-25. DOI: 10.3969/j.issn.1001-1986.2020.05.002

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Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation, Qinshui basin

1. Shanxi Branch of China National Geological Exploration Center of Building Materials Industry, TaiYuan 030031, China;
2. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3. Shanxi Provincial Guoxin Energy Development Group Co. Ltd., Taiyuan 030006, China

Funds:

Youth Program of National Natural Science Foundation of China(41802191)

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Received Date: June 30, 2020
Revised Date: September 07, 2020
Published Date: October 24, 2020

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Abstract

Abstract

In order to deeply analyze the indication of oil shale development characteristics on paleoenvironments and provide theoretical guidance for oil shale resource evaluation, the organic geochemistry and elemental geochemistry characteristics of the Neogene Zhangcun Formation oil shale in the central part of the Qinshui basin were analyzed by Rock-Eval and TOC and the paleoclimate and paleogeographic environments of the depositional period were discussed as well. The results show that the oil shale of Zhangcun Formation has the low oil content which Tar=4.15%, higher hydrocarbon potential, kerogen is of sapropel type(I₁), which has relatively shallow burial depth. The element enrichment coefficients indexes indicated that the source of organic matters are a mixed source, but productivity of lakes provided major material for oil shale. The climate was warm and humid during the depositional period, and the water in the basin was gradually desalted from salt lake, while the oil shale was formed in an anaerobic and deep lake environment with weak stratification. The geochemical characteristics of oil shale are well coupled with the palaeoclimate and palaeogeographical environments.
- oil shale,
- Rock-Eval,
- geochemistry,
- palaeoenvironment,
- element enrichment coefficients indexes

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Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation, Qinshui basin

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