塔河地区奥陶系深埋岩溶洞穴特征及保存机制初探
网络出版日期: 2014-04-06
基金资助
国家重点基础研究发展计划(973)项目“塔里木盆地构造差异演化与下古生界油气成藏过程”(编号:2012CB214804)和国家重大 科技专项“深层油气有效储集体形成、分布规律与预测技术”(编号:2011ZX05008-003-30)联合资助
Characteristics and preservation mechanism of the Ordovician deep burial karst caves in Tahe area
Online published: 2014-04-06
王秀娟 , 王明磊 , 赵爱彬 . 塔河地区奥陶系深埋岩溶洞穴特征及保存机制初探[J]. 岩性油气藏, 2014 , 26(2) : 27 -31 . DOI: 10.3969/j.issn.1673-8926.2014.02.005
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.
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