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Differential enrichment mechanism of organic matters in the marine-continental transitional shale in northeastern Ordos Basin, China: Control of sedimentary environments

文献类型：期刊论文

作者Chen, Yuhang1,3,4,5; Wang, Yingbin2; Guo, Mingqiang2; Wu, Heyuan5; Li, Jun5; Wu, Weitao5; Zhao, Jingzhou3,5
刊名JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
出版日期2020-11-01
卷号83页码:14
ISSN号1875-5100
关键词Transitional shales Organic matter enrichment Paleoenvironments clastic influx Ordos Basin
DOI10.1016/j.jngse.2020.103625
通讯作者Chen, Yuhang(cyh@xsyu.edu.cn) ; Zhao, Jingzhou(jzzhao@xsyu.edu.cn)
英文摘要The organic-rich shales deposited in marine-continental transitional environments are well developed in China. Previous studies mainly focused on the petrology and geochemical characteristics of the transitional shale. However, the factor controlling organic matter (OM) enrichment in the shale has not been studied adequately, limiting the optimal reservoir selection in shale gas exploration. Based on laboratory analyses and field investigations, this paper documents the geochemical features of the transitional shales in Upper Paleozoic (the Benxi, Taiyuan and Shanxi Formations) of the northeastern Ordos Basin, China. The sedimentary environment evolution and the relevant influence on OM enrichment are discussed to reveal the factor controlling the interlayer difference of the OM enrichment in the shale. The results show that the shale in the Taiyuan Formation hosts the highest OM content in the Upper Paleozoic. The sedimentary setting of the study area transited from barrier-flats to fluvial deltas, accompanied by gradually arid climates, decreasing degree of reduction and salinity of waters, and increasing clastic influx. During the middle stage of the marine-continental transition (the depositional stage of the Taiyuan Formation), the warm and humid climate was beneficial to the OM production, and the anoxic condition was conducive to the OM preservation. In addition, the increasing clastic influx ensured the OM input, and the moderate depositional rate favored the OM preservation. All the factors above commonly established an excellent environment for the OM enrichment. Our results reveal the OM enrichment mechanism in transitional shales, which is helpful to the optimal reservoir selection in the shale gas exploration in the Ordos Basin as well as the similar basins.
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] ; Foundation of Clastic Sedimentology and Reservoir Evaluation[2019QNKYCXTD05]
WOS研究方向Energy & Fuels ; Engineering
语种英语
出版者ELSEVIER SCI LTD
WOS记录号WOS:000581887900087
源URL[http://ir.qdio.ac.cn/handle/337002/169108]  
专题海洋研究所_海洋地质与环境重点实验室
通讯作者Chen, Yuhang; Zhao, Jingzhou
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.CNOOC Ltd, Unconvent Oil & Gas Branch, Beijing 100011, Peoples R China
3.Xian Shiyou Univ, Shaanxi Key Lab Petr Accumulat Geol, Xian 710065, Peoples R China
4.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
5.Xian Shiyou Univ, Sch Earth Sci & Engn, Xian 710065, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Yuhang,Wang, Yingbin,Guo, Mingqiang,et al. Differential enrichment mechanism of organic matters in the marine-continental transitional shale in northeastern Ordos Basin, China: Control of sedimentary environments[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2020,83:14.
APA Chen, Yuhang.,Wang, Yingbin.,Guo, Mingqiang.,Wu, Heyuan.,Li, Jun.,...&Zhao, Jingzhou.(2020).Differential enrichment mechanism of organic matters in the marine-continental transitional shale in northeastern Ordos Basin, China: Control of sedimentary environments.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,83,14.
MLA Chen, Yuhang,et al."Differential enrichment mechanism of organic matters in the marine-continental transitional shale in northeastern Ordos Basin, China: Control of sedimentary environments".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 83(2020):14.

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来源：海洋研究所

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