鄂尔多斯盆地姬塬地区上三叠统延长组长6油层组沉积环境: 来自地球化学的证据

doi:10.7605/gdlxb.2019.03.032

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Abstract The Upper Triassic Yangchang Formation is the main oil-bearing strata in Jiyuan area,middle-western Ordos Basin. The Chang 6 oil￣bearing interval is one of the most important oil-bearing horizons,which can be subdivided into 3 layers,i.e., 6₃,6₂,and 6₁ layers in ascending order. The Chang 6 oil-bearing interval spans two three-order sequences. The redox environment,salinity,water depth and paleoclimate are reconstructed based on element geochemical data. In the warm and humid climate,the lake was generally low in paleo salinity. In addition,both oxidizing and reducing conditions co-existed. The reducing environment gradually decreased and migrated. While the water depth tended to decrease and become stable in the latter. In Jiyuan area,the sedimentary characteristics of Chang 6₁,6₂ and 6₃ layers are different. At the beginning of Chang 6,it inherited the sedimentary characteristics of the lacustrine basin in the end of Chang 7 oil-bearing interval. The lake range of Chang 6₃ was large and its sand bodies were mainly composed of the mouth bars and distal bars. Turbidite sand bodies developed in semi-deep lake. Along with the declining lake level,the length of the shoreline of Chang 6₂ was obviously reducing,and the-semi deep lake did not develop. The lake shoreline length of the Chang 6₁ was slightly smaller than that of the Chang 6₂,and the sand body thickness increased dramatically. In the range of the lakeshore line,there were many sand bodies formed by superposition of river channels and mouth bars. The results can help to clarify the sedimentary evolution laws of the Jiyuan area and provide reference for further exploration and development.

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	Articles by authors
	Wang Teng-Fei
	Jin Zhen-Kui
	Chu Mei-Juan
	Li Shi-Xiang
	Yu Xiao-Xia
	Wang Xin-Yao
	Li Shuo

Key words： Ordos Basin Jiyuan area Upper Triassic Yangchang Formation sedimentary evolution

Received: 01 April 2018

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Corresponding Authors: Jin Zhen-Kui,born in 1963,is a professor and Ph.D. supervisor. He is mainly engaged in sedimentology, sequence stratigraphy and reservoir prediction. E-mail: jinzhenkui@188.com.

About author: Wang Teng-Fei,born in 1988,is a post-doctoral research assistant at China University of Petroleum(Beijing). Now he is mainly engaged in sedimentology. E-mail: wang.tf@foxmail.com.

Cite this article:

Wang Teng-Fei,Jin Zhen-Kui,Chu Mei-Juan et al. Sedimentary environment of the Chang 6 oil￣bearing interval of Upper Triassic Yanchang Formation in Jiyuan area,Ordos Basin: Evidences from geochemical data[J]. JOPC, 2019, 21(3): 505-516.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2019.03.032 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2019/V21/I3/505

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