Geochemical characteristics and sedimentary setting of chang 9 shale in the Upper Triassic Yanchang Formation of southeastern Ordos Basin (NW China)

doi:10.1016/j.petrol.2020.108081

IOCAS-IR > 海洋地质与环境重点实验室

	Geochemical characteristics and sedimentary setting of chang 9 shale in the Upper Triassic Yanchang Formation of southeastern Ordos Basin (NW China)
	Chen, Yuhang 1,2,3,4; Liu, Shehu 5; Zhu, Zengwu 5; Wang, Zhe 5; Sun, Xiaoguang 6; Xu, Tong 6
	2021
发表期刊	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN	0920-4105
卷号	196 页码:15
通讯作者	Chen, Yuhang(cyh@xsyu.edu.cn)
摘要	In addition to the organic-rich shale in the Chang 7 Member (Ch7 shale) of the Ordos Basin, the shale hosted in the Chang 9 Member (Ch9 shale) is another source rock and potential unconventional target. However, there is a general lack of consensus on the features and potential of the Ch9 shale. In order to determine the potential of the Ch9 shale, this study analyzes its paleoenvironment and sedimentary setting based on the integrated analysis of geochemistry and sedimentary facies. A comparison of geochemical features between the Ch9 shale and the organic-rich Ch7 shale is made to evaluate the factors controlling organic matter (OM) enrichment of the Ch9 shale. The results show that the Ch9 shale has good hydrocarbon potential, and terrestrial OM is important component of the OM in the Ch9 shale. The Ch9 shale was deposited in climatic transition period from cold and dry to warm and humid, when the water body was suboxic-anoxic and freshwater. The relatively cold and dry climate and suboxic-anoxic water condition in the Ch9 period could not provide the same excellent conditions for OM enrichment as that in the Ch7 period. The Ch9 shale is composed of sediments mixed with felsic rocks that originated from continental island arcs and active continental margins. The active tectonic setting resulted in event deposition (e.g. turbidity flows and hydrothermal fluid activity) during the deposition of Ch9 shale. The input of terrestrial OM carried by turbidity flows also promoted OM enrichment, however, the very high depositional rates caused by turbidity flows diluted the OM, which probably offset the effect of hydrothermal on OM enrichment. Our results are helpful to revealing the source potential of the Ch9 shale, providing a theoretical basis for the shale oil and gas exploration in the Ordos Basin.
关键词	Ch9 shale Ordos basin Paleoenvironments Event deposition Organic matter enrichment
DOI	10.1016/j.petrol.2020.108081
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41802128] ; Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences[OMG18-12] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG10] ; Natural Science Foundation of Shaanxi Province of China[2019JQ-828] ; Clastic Sedimentology and Reservoir Evaluation[2019QNKYCXTD05] ; Public Geological Project in Shaanxi Province[20150301]
WOS研究方向	Energy & Fuels ; Engineering
WOS类目	Energy & Fuels ; Engineering, Petroleum
WOS记录号	WOS:000600808100215
出版者	ELSEVIER
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/169954
专题	海洋地质与环境重点实验室
通讯作者	Chen, Yuhang
作者单位	1.Xian Shiyou Univ, Sch Earth Sci & Engn, Xian 710065, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 4.Xian Shiyou Univ, Shaanxi Key Lab Petr Accumulat Geol, Xian 710065, Shaanxi, Peoples R China 5.Shaanxi Inst Geol Survey, Xian 710054, Peoples R China 6.Xinzhou Co, PetroChina Coalbed Methane Co Ltd, Taiyuan 030000, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Yuhang,Liu, Shehu,Zhu, Zengwu,et al. Geochemical characteristics and sedimentary setting of chang 9 shale in the Upper Triassic Yanchang Formation of southeastern Ordos Basin (NW China)[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2021,196:15.
APA	Chen, Yuhang,Liu, Shehu,Zhu, Zengwu,Wang, Zhe,Sun, Xiaoguang,&Xu, Tong.(2021).Geochemical characteristics and sedimentary setting of chang 9 shale in the Upper Triassic Yanchang Formation of southeastern Ordos Basin (NW China).JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,196,15.
MLA	Chen, Yuhang,et al."Geochemical characteristics and sedimentary setting of chang 9 shale in the Upper Triassic Yanchang Formation of southeastern Ordos Basin (NW China)".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 196(2021):15.

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