Collaborative controls of the Early-Eocene greenhouse climates and transgression on deposition of salt-bearing sequence of Kumugeliemu Group in Kuqa Depression
ZHANG Xiting1,2, FAN Kunyu3, GUO Pei1,2, LI Pengzhen3, MIAO Rulin2,4, DENG Bin2,4
1 Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources,Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 3 Research Institute of Exploration & Development PetroChina Tarim Oilfield Company,Xinjiang Korla 652801,China; 4 School of Energy,Chengdu University of Technology,Chengdu 610059,China
Abstract The thick salt-bearing sequence in Paleogene Kumugeliemu Group(54-46 Ma)of the Kuqa Depression acts as the high-quality regional caps for oil and gas accumulation. However,the original temporal-spatial distribution,palaeogeographic environment,and sedimentary controlling factors of the salt-bearing sequence remain unclear,which causes great difficulties for the drilling of the subsalt hydrocarbon reservoirs. Through the outcrop measurement at the basin margin and the logging element analysis within the basin,the correlation of sedimentary cycles between the lake-basin center and the margin was carried out to explore the main controlling factors of the salt-bearing sequence deposition of Kumugeliemu Group. The Kumugeliemu Group consists of three third-order cycles. The first third-order cycle Ⅰ1 is characterized by the lithofacies assemblage of conglomerates,sandstones,mudstones and gypsums at basin margins,and of mudstones,gypsums,halites,carbonates at basin center,indicating an palaeogeographic-environment transformation from a terrigenous basin to a continental-margin basin. The second third-order cycle Ⅰ2 is characterized by the lithofacies assemblage of conglomerates,sandstones,mudstones,and gypsums at basin margins and the assemblage of thick halites and minor mudstones at basin center,corresponding to a depositional model of a terrigenous epeiric basin. The third third-order cycle Ⅰ3 has similar lithofacies assemblage at the lake-basin margin and center,characterized by thin layer gypseous mudstones and mudstones,typical depositional model of terrigenous playa lakes. Combined with the Early-Eocene global climates and sea-level changes,it is believed that the deposition of thick gypsum rocks of Ⅰ1(ca. 54-51 Ma)were related to the Early Eocene Climatic Optimum(53-51 Ma)and global sea-level rise. The deposition of thick halite rocks in Ⅰ2(ca. 51-48 Ma)was controlled by the global dry climate and sea-level rise. The absence of thick salt-bearing sequence deposits in Ⅰ3(ca. 48-46 Ma)is related to the global dry climate and sea-level drops.
Fund:Financially supported by the National Natural Science Foundation of China(Nos. 42272117,42002116)
Corresponding Authors:
GUO Pei,born in 1990,Ph.D.,is an associate professor. She is engaged in sedimentology and petroleum geology of saline lake basins. E-mail: guopei18@cdut.edu.cn.
About author: ZHANG Xiting, born in 1999, major in geology. E-mail: 1348167494@qq.com.
Cite this article:
ZHANG Xiting,FAN Kunyu,GUO Pei et al. Collaborative controls of the Early-Eocene greenhouse climates and transgression on deposition of salt-bearing sequence of Kumugeliemu Group in Kuqa Depression[J]. JOPC, 2024, 26(4): 926-940.
ZHANG Xiting,FAN Kunyu,GUO Pei et al. Collaborative controls of the Early-Eocene greenhouse climates and transgression on deposition of salt-bearing sequence of Kumugeliemu Group in Kuqa Depression[J]. JOPC, 2024, 26(4): 926-940.
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