塔里木盆地塔河地区中下奥陶统鹰山组碳酸盐岩层系内幕不整合识别特征<sup>*</sup>

doi:10.7605/gdlxb.2017.03.035

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Abstract This paper integrates outcrops,well log and seismic data to describe the features of unconformity T⁶₇ within the Yingshan Formation in Tahe area, Tarim Basin. The unconformity T⁶₇ is characterized by lithofacies transitional surface at outcrops. δ¹³C and δ¹⁸O values below the unconformity T⁶₇ are significantly more negative,the same as the trace elements of Sc,Co,Ni,Ba,U,and Sr. The contents of Li and V below the unconformity T⁶₇ are relatively high. The GR logs in the lower part of the Yingshan Formation are more variable and have higher values. The Th/U values amended by filtering method are low at the section of unconformity T⁶₇ . It is difficult to identify the unconformity T⁶₇ based on the phenomena of reflection termination such as truncations,onlap and toplap in seismic profile,but some “beads-like” reflection anomalies are found along the unconformity T⁶₇ surface. These “beads-like” reflections are interpreted to indicate karst-relate palaeo-caverns. The unconformity T⁶₇ results from a short-term exposure(<1,Ma)and is controlled by sea-level changes and the palaeogeomorphology. The exposure degree of the unconformity T⁶₇ is variable in Tahe area,with the largest in the middle-east part,and the lowest in the northwest part. The unconformity T⁶₇ has great importance for the formation of carbonate reservoirs in the Yingshan Formation. It not only can provide the geological background for the interlayer karst development,but also can connect the fracture system to provide channels for the meteoric water flowing.

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	Wei Duan
	Gao Zhiqian
	Yang Xiaoqun
	Meng Miaomiao
	Chen Yue
	Dong Zhenkun
	Wang Shanshan

Key words： Tarim Basin Tahe area Ordovician Yingshan Formation unconformity

Received: 23 October 2016 Published: 01 June 2017

ZTFLH:

P588.24+5

Fund:[Co-funded by the National Natural Science Foundation of China(No.41102087), the National 973 Program of China(No.2012CB214802) and National Science-Technology Major Project of China(Nos.2011ZX05005-002-010HZ,2011ZX05009-002)]

Corresponding Authors: Gao Zhiqian,born in 1978,doctor,is a professor in China University of Geosciences(Beijing). He is mainly engaged in the study of carbonate sedimentology and sequence stratigraphy. E-mail: gzq@cugb.edu.cn.

About author: Wei Duan,born in 1990,is a M.S. degree candidate in China University of Geosciences(Beijing). His research field is carbonate sedimentology and sequence stratigraphy. E-mail: weiduancugb@qq.com.About the corresponding author Gao Zhiqian,born in 1978,doctor,is a professor in China University of Geosciences(Beijing). He is mainly engaged in the study of carbonate sedimentology and sequence stratigraphy. E-mail: gzq@cugb.edu.cn.

Cite this article:

Wei Duan,Gao Zhiqian,Yang Xiaoqun et al. Identification methods and features of unconformity within carbonate successions of the Lower-Middle Ordovician Yingshan Formation in Tahe area,Tarim Basin[J]. JOPC, 2017, 19(3): 457-468.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2017.03.035 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2017/V19/I3/457

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