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.
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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