Sedimentary characteristics and controlling factors of grain banks of the Middle Cambrian Zhangxia Formation in southern Ordos Basin
Wang Zhen1, Zhang Yuan-Fu1, 2, Hu Chen-Lin1, Bai Yi-Ming1, Zhang Bo-Wen1, Wei Kang-Qiang1
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 2 Institute of Scientific Research,China University of Geosciences(Beijing),Beijing 100083;
Abstract The carbonate grain banks serve as important oil and gas reservoirs. In this paper,the sedimentary characteristics,distribution and controlling factors of the grain banks of the Middle Cambrian Zhangxia Formation in southern Ordos Basin were studied by integration of outcrop,core,logging and thin section data. Results show that the carbonate grain banks,dominated by oolitic beach,are extensively developed in the Zhangxia Formation in the study area. The rock types of grain banks commonly encompass grain limestone,grain dolomite and crystalline dolomite,and the grain types primarily consist of oolitic,bioclast,gravel-sized debris and sand-sized debris in the Zhangxia Formation in southern Ordos Basin. The grain banks are characterized by vertically superposed coarsening-upword cycles,which form the grain bank deposition with a considerable thickness. Combined with the Cambrian lithofacies palaeogeographic characteristics in the Ordos Basin,it is considered that the characteristics and planar-distribution of the grain banks are comprehensively controlled by relative sea level change,palaeogeomorphology and tectonic activity. Particularly,the rift trough roughly in NE direction significantly controlled the development and distribution of oolitic beaches in the platform of Zhangxia Formation in southern Ordos Basin.
Fund:[Co-funded by the National Natural Science Foundation of China(No.41572092)and the National Key Technologies R & D Program of China during the 13th Five-Year Plan Period(No.2017ZX05009-002)]
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: Wang Zhen,born in 1990,is a master degree candidate of China University of Geosciences(Beijing). He is mainly engaged in sedimentology. E-mail: wz@cugb.edu.cn.About the corresponding author 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.
Cite this article:
Wang Zhen,Zhang Yuan-Fu,Hu Chen-Lin et al. Sedimentary characteristics and controlling factors of grain banks of the Middle Cambrian Zhangxia Formation in southern Ordos Basin[J]. JOPC, 2018, 20(2): 219-230.
Wang Zhen,Zhang Yuan-Fu,Hu Chen-Lin et al. Sedimentary characteristics and controlling factors of grain banks of the Middle Cambrian Zhangxia Formation in southern Ordos Basin[J]. JOPC, 2018, 20(2): 219-230.
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