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

Authors

LIU Yanhai, Shanxi Branch of China National Geological Exploration Center of Building Materials Industry, TaiYuan 030031, China; College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
LI Kunjie, Shanxi Provincial Guoxin Energy Development Group Co. Ltd., Taiyuan 030006, China
LIU Dongna, College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaFollow
XUE Shubin, Shanxi Branch of China National Geological Exploration Center of Building Materials Industry, TaiYuan 030031, China
LIU Yangfe, Shanxi Branch of China National Geological Exploration Center of Building Materials Industry, TaiYuan 030031, China
CHU Yonghui, Shanxi Branch of China National Geological Exploration Center of Building Materials Industry, TaiYuan 030031, China

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.

Keywords

oil shale, Rock-Eval, geochemistry, palaeoenvironment, element enrichment coefficients indexes

DOI

10.3969/j.issn.1001-1986.2020.05.002

Recommended Citation

LIU Yanhai, LI Kunjie, LIU Dongna, et al. (2020) "Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation, Qinshui basin," Coal Geology & Exploration: Vol. 48: Iss. 5, Article 3.
DOI: 10.3969/j.issn.1001-1986.2020.05.002
Available at: https://cge.researchcommons.org/journal/vol48/iss5/3

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