Sedimentary facies of the Member 1 of the Upper Triassic Yanchang Formation in Zizhou area of Ordos Basin and the development of mouth bar in shallow-water delta
Li Yuan1, Zhang Yuan-Fu1,2, Wang Tong3, Zhang Qing4, Wang Min5, Li Rui-Zhi1, Yuan Xiao-Dong1
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 Institute of Scientific Research,China University of Geosciences(Beijing),Beijing 100083,China; 3 Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China; 4 Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company,Xi’an 710018,China; 5 PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China
Abstract During the depositional period of the Upper Triassic Yanchang Formation,the Ordos Basin was a large depression basin with gentle slope,shallow water and stable tectonic activity, and is conducive to the formation of shallow-water delta. Through field outcrop observation, it is found that the shallow-water delta was developed in Dalihe section in Zizhou area of the Ordos Basin,and mouth bars were developed in shallow-water delta front deposits. Three upward-coarsening cycles with finer lower part and coarser upper part were observed in the mouth bar, and the thickness of argillaceous interlayers in each cycle increased upward, which indicates that during the formation of the mouth bar, the accommodation space increased upward. We summarized development of mouth bar in shallow-water deltas and believed that the formation of mouth bar is jointly controlled by accommodation space and sediment supply: (1) In the case that the accommodation space is increasing, the formation of mouth bar is determined by the amount of sediment supply. If a certain amount of sediment supply exists, then mouth bars formed in a retrogradation pattern. (2) In the case that the accommodation space is decreasing, the formation of mouth bar is determined by the remaining accommodation space. If the remaining accommodation space exists, then mouth bars formed in a progradation pattern. (3) Mouth bars do not develop if there is no accommodation space. The development of mouth bar in the Member 1 of Yangchang Formation in Zizhou area of the Ordos Basin belongs to the first case.
Fund:Co-funded by the National Natural Science Foundation of China(No.41572092)and the National Science and Technology Major Projects of China(Nos. 2017ZX05009-002-001,2016ZX05033-003-004)
Corresponding Authors:
Zhang Yuan-Fu,born in 1979,is an associate professor of China University of Geosciences(Beijing). His research interests are sedimentology,sequence stratigraphy and geophysics. E-mail: zhang.yuanfu@163.com.
About author: Li Yuan,born in 1995,is a doctor degree candidate of China University of Geosciences(Beijing). She is mainly engaged in applied sedimentology. E-mail: liyuan95@cugb.edu.cn.
Cite this article:
Li Yuan,Zhang Yuan-Fu,Wang Tong et al. Sedimentary facies of the Member 1 of the Upper Triassic Yanchang Formation in Zizhou area of Ordos Basin and the development of mouth bar in shallow-water delta[J]. JOPC, 2019, 21(5): 757-766.
Li Yuan,Zhang Yuan-Fu,Wang Tong et al. Sedimentary facies of the Member 1 of the Upper Triassic Yanchang Formation in Zizhou area of Ordos Basin and the development of mouth bar in shallow-water delta[J]. JOPC, 2019, 21(5): 757-766.
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