Division of karst platform architecture and cave levels correlation in the early Hercynian, Tahe Oilfield, Tarim Basin
Li Yuan1, Cai Zhongxian1, 2
1 Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,Hubei; 2 Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,Hubei;
Abstract Multi-levels of karst platforms are generally formed in karst regions due to multi-stage tectonic movements,and one phase of caves will be generated by a drainage base level corresponding to a karst platform,which are observed in modern karst geological surveys. A complex karst cave system,marked by multi-layer architecture in vertical and acted as an important exploration target,was created in early Hercynian,Tahe Oilfield, Tarim Basin. In order to better understand the mechanism of cave development,modern karst theories,3-D seismic data and three different methods,namely river terraces,flow concentration and onlap termination,were utilized to subdivide karst platform architecture. Moreover,cave levels correlation constrained by karst platform was carried out. This study result demonstrated that:(1)karst platforms in Tahe Oilfield can be subdivided into 4 levels,and platform I was first formed,while the area of platform Ⅲ was the maximum; (2)three cave levels were identified,distributing to be layered,and the scale of the cave level controlled by platform Ⅲ was the largest. Actually,this three cave levels are not overlapped in vertical except some part of the cave level controlled by platform Ⅲ extending to platform Ⅱ. This feature above proved that the cave level controlled by platform Ⅲ was resulted from a long stable tectonic stage,while the other two cave levels were created in a relatively restricted tectonic stage, and the headward￣erosion scale controlled by ground water level was limited.
Corresponding Authors:
Cai Zhongxian, born in 1963, is a professor in China University of Geosciences(Wuhan). He is mainly engaged in carbonate reservoir geology. E-mail: 115173931@qq.com.
About author: Li Yuan,born in 1987,is a doctoral candidate. He is mainly engaged in carbonate reservoir geology. E-mail: liyuan586287@126.com.About the corresponding author Cai Zhongxian, born in 1963, is a professor in China University of Geosciences(Wuhan). He is mainly engaged in carbonate reservoir geology. E-mail: 115173931@qq.com.
Cite this article:
Li Yuan,Cai Zhongxian. Division of karst platform architecture and cave levels correlation in the early Hercynian, Tahe Oilfield, Tarim Basin[J]. JOPC, 2016, 18(4): 560-568.
Li Yuan,Cai Zhongxian. Division of karst platform architecture and cave levels correlation in the early Hercynian, Tahe Oilfield, Tarim Basin[J]. JOPC, 2016, 18(4): 560-568.
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