Eogenetic karst characteristics and its geological significance of mixed rocks in the Cambrian Terreneuvian Yuertus Formation in northwestern Tarim Basin
Jin Zhi-Min1,2, Tan Xiu-Cheng1,2, Tang Hao1,2, Shen An-Jiang3, Li Fei1,2, Qiao Zhan-Feng3, Luo Si-Cong1,2, Zheng Jian-Feng3, Wang Xiao-Fang3
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500, China; 2 Research Branch of Southwest Petroleum University,Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China; 3 Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023, China
Abstract Based on macro- and micro-scale studies on the outcrop profiles in the Akesu-Keping-Wushi areas in Northwestern Tarim Basin,three distinct subaerial exposed surfaces within the Yuertus Formation of the Cambrian Terreneuvian Series have been identified and are characterized as follows: (1)ferruginous crust,(2)near-surface karst(plastic)breccia,(3)karst trench,fissure and cystic cave,(4)breccia and terrigenous clastics filled in Karst system,and (5)sediments onlapped onto the exposed surfaces. The comprehensive analysis shows that the Yurtus Formation in the study area is not continuously deposited,but presents several internal sedimentary hiatus and a regional unconformable contact with the overlying Xiaoerbulake Formation. Meanwhile,based on a comparative analysis of eogenetic karst characteristics between limestone and dolomite,it is suggested that the mixed rocks(mixed siliciclastic-carbonate sediments) with poor percolation conditions are characterized by the development of small karst caves and immature horizontal underflow zone. This can be used to distinguish the typical characteristics of facies-controlled karst caves,variegated karst,and near-in-situ brecciation of limestone from dolomite-type in early diagenetic stage. The findings show that the karstification and reservoir optimization in the early diagenetic stage under open conditions are more controlled by the rock fabric,so it is inferred that under relatively closed burial conditions,the early densified rocks are difficult to undergo karst modification to form facies-controlled vuggy reservoirs. This result not only has an important reference for the formation and maintenance of reservoirs under deep burial conditions,but also provides new materials for the supplement of eogenetic karst geological theory.
Fund:Financially supported by the National Science and Technology Major Project of China(No.2016ZX05004002-001)
Corresponding Authors:
Tan Xiu-Cheng,born in 1970,is a professor and doctorial tutor of Southwest Petroleum University. He is mainly engaged in reservoir sedimentology. E-mail: tanxiucheng70@163.com.
About author: Jin Zhi-Min,born in 1994,is a Ph.D. candidate of Southwest Petroleum University. He majors in geology. E-mail: Jzmssg052@163.com.
Cite this article:
Jin Zhi-Min,Tan Xiu-Cheng,Tang Hao et al. Eogenetic karst characteristics and its geological significance of mixed rocks in the Cambrian Terreneuvian Yuertus Formation in northwestern Tarim Basin[J]. JOPC, 2021, 23(1): 191-206.
Jin Zhi-Min,Tan Xiu-Cheng,Tang Hao et al. Eogenetic karst characteristics and its geological significance of mixed rocks in the Cambrian Terreneuvian Yuertus Formation in northwestern Tarim Basin[J]. JOPC, 2021, 23(1): 191-206.
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