塔河地区奥陶系深埋岩溶洞穴特征及保存机制初探

doi:10.3969/j.issn.1673-8926.2014.02.005

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 27-31.doi: 10.3969/j.issn.1673-8926.2014.02.005

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Characteristics and preservation mechanism of the Ordovician deep burial karst caves in Tahe area

LEI Chuan^1，2， CHEN Honghan ^1，3， SU Ao³， HAN Shumin⁴

1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of
Sciences， Lanzhou 730000， China； 2. University of Chinese Academy of Sciences， Beijing 100049， China；
3. Faculty of Earth Resources， China University of Geosciences， Wuhan 430074， China；
4. Bureau of Geophysics Prospecting Inc.， CNPC， Zhuozhou 072750， Hebei， China

Online:2014-04-06 Published:2014-04-06

Abstract

Abstract:

The Ordovician karst caves in Tahe area are characterized deep buried depth, and they are the typical examples to study deep buried caves. The preservation mechanism is not clear. Based on drilling, logging and seismic data, this paper studied the recognition, distribution and fillings of deep burial paleo-karst caves. The result shows that: ①filling degree in highland is higher than that in slope relatively; ②stalactite precipitation associated with collapse is mainly in karst highland; ③clastic rock derived from brine sediment is observed in caves; ④there are several cave systems under the unconformity within 200 m depth. All of these conclusions suggest that the preservation of caves is related to the ground water level. The preservation mechanism of deep buried karst caves may be the hydraulic support of undercurrent.

Key words:

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LEI Chuan， CHEN Honghan， SU Ao， HAN Shumin. Characteristics and preservation mechanism of the Ordovician deep burial karst caves in Tahe area[J].Lithologic Reservoirs, 2014, 26(2): 27-31.

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