Sedimentary environments and sedimentary model of carbonate rocks in the Cenozoic lacustrine basin,western Qaidam Basin
Ji Youliang1, 2, Ma Dade3, Xue Jianqin3, Wang Peng3, Wu Yanxiong3, Zeng Li1, 2, Jin Li1, 2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 Exploration and Development Research Institute of Qinghai Oilfield,PetroChina,Dunhuang 736202,Gansu
Abstract This paper focuses on the lacustrine carbonate strata of the Ganchaigou Formation of Cenozoic in western Qaidam Basin. Based on field outcrop survey,core sample identification, analysis data, and well logging data,the types distribution and sedimentary facies of carbonate deposits in the study area were studied. By analyzing the forming control factors,corresponding depositional model is established to guide the exploration. Research shows that the western Qaidam Basin is a typical saline lacustrine basin. There are four types and 11 kinds of lacustrine carbonates including grain limestone,algal limestone,crystal limestone and peperite carbonate developed in western Qaidam Basin which were mainly deposited in five microfacies of lime-mud flats,grain bank,algal reef,lake-bay and semi-deep lake facies. By analyzing the spatial and temporal distribution characteristics of different carbonates and microfacies,the conclusion is made that the development of lacustrine carbonates in western Qaidam Basin is mainly controlled by the basin tectonic movements,injection of terrigenous clastics,water palaeosalinity under the ancient climate and palaeotopography with different palaeo-water-depth. On this basis,a comprehensive vertical depositional model of lacustrine carbonate with associated gypsum-salt rock in western Qaidam Basin is established. The research indicated that, during the sedimentary period of the Ganchaigou Formation in western Qaidam Basin, the lacustrine basin was typical saline lacustrine basin with stable tectonic activities; whereas the lake level reached the peak. Carbonate rocks, which were developed in the transgression stage, were frequently interbedded with clastic rocks due to the high￣frequency lake level changes. In the low￣water season, clastic beach bars or delta front deposits were developed at basin slope; while at lake transgression stage, oolitic banks and algal limestones were developed at the basin break in slope, and marlite and lime mudstones were developed in the depression area of the basin.
Fund:Financially supported by General Program of the National Natural Science Fundation of China (No.41672098)
About author: About the first author Ji Youliang,born in 1962,is a professor in China University of Petroleum(Beijing). He is mainly engaged in petroleum geology,sedimentology and sequence stratigraphy. E-mail: ji_youliang@sina.com.
Cite this article:
Ji Youliang,Ma Dade,Xue Jianqin et al. Sedimentary environments and sedimentary model of carbonate rocks in the Cenozoic lacustrine basin,western Qaidam Basin[J]. JOPC, 2017, 19(5): 757-772.
Ji Youliang,Ma Dade,Xue Jianqin et al. Sedimentary environments and sedimentary model of carbonate rocks in the Cenozoic lacustrine basin,western Qaidam Basin[J]. JOPC, 2017, 19(5): 757-772.
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