油气地质

塔河地区奥陶系深埋岩溶洞穴特征及保存机制初探

  • 王秀娟 ,
  • 王明磊 ,
  • 赵爱彬
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  • 1.中国科学院 兰州油气资源研究重点实验室,兰州 730000; 2.中国科学院大学,北京 100049; 3.中国地质 大学(武汉) 资源学院,武汉 430074; 4.中国石油集团东方地球物理有限责任公司,河北 涿州 072750
雷川(1988-),男,中国科学院大学在读硕士研究生,研究方向为碳酸盐岩储层地质学。 地址:(730000)甘肃省兰州市城关区东岗西路 382 号。 电话:(0931)4960870。 E-mail:leichuan1988@163.com。

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

  • WANG Xiujuan ,
  • WANG Minglei ,
  • ZHAO Aibin
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  • 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 published: 2014-04-06

摘要

塔河地区奥陶系碳酸盐岩深埋岩溶洞穴的埋藏深度较大,在世界范围内罕见,是研究深埋洞穴的典 型实例,目前对于其保存机制尚不清楚。 根据钻井、测井和地震资料,在深入调研研究区深埋古岩溶洞穴 的识别、分布和充填特征的基础上发现:①岩溶高地充填程度相对于岩溶斜坡明显偏高;②伴随垮塌的钟 乳石类次生化学沉淀多集中于岩溶高地;③洞穴内可见海岸碎屑岩;④ T74不整合面以下 200 m 深度段内 存在多个洞穴系统,均暗示洞穴的保存与潜水面有关,因此可推测出该区埋藏岩溶洞穴的保存与潜流带 水力支撑作用有关。

本文引用格式

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

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.

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