古地理学报 ›› 2015, Vol. 17 ›› Issue (4): 441-456. doi: 10.7605/gdlxb.2015.04.037

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早成岩期喀斯特化研究新进展及意义

谭秀成1, 2, 3, 肖笛1, 2, 陈景山2, 李凌2, 3, 刘宏2, 3   

  1. 1 油气藏地质及开发工程国家重点实验室,西南石油大学,四川成都 610500
    2 天然气地质四川省重点实验室,西南石油大学,四川成都 610500
    3 中国石油碳酸盐岩重点实验室沉积-成藏研究室,西南石油大学,四川成都 610500
  • 收稿日期:2014-12-20 出版日期:2015-08-01 发布日期:2015-08-01
  • 作者简介:谭秀成,男,1970年生,教授,博士生导师,主要从事储层沉积学研究。E-mail: tanxiucheng70@163.com。
  • 基金资助:

    “十二五”国家科技攻关重大专项(编号:2011ZX05004-005-03)和四川省省属高校“天然气地质”科研创新团队建设计划联合资助

New advance and enlightenment of eogenetic karstification

Tan Xiucheng1,2,3, Xiao Di1,2, Chen Jingshan2, Li Ling2,3, Liu Hong2,3   

  1. 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan
    2 Sichuan Province Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan
    3 Branch of Deposition and Accumulation,PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University,Chengdu 610500,Sichuan
  • Received:2014-12-20 Online:2015-08-01 Published:2015-08-01
  • About author:Tan Xiucheng,born in 1970,is a professor and doctorial superviser of Southwest Petroleum University. He is mainly engaged in reservoir sedimentology. E-mail: tanxiucheng70@163.com.

摘要:

基于四川盆地多个层位的、不同岩相的碳酸盐岩具有差异岩溶特征的发现与思考,结合当今国外有关碳酸盐岩早成岩期喀斯特化研究进展的调研,进行了简单的梳理与归纳。(1)喀斯特物质基础可分为孔渗性较好的早成岩期岩石与致密的晚成岩期岩石2类。它们分别以基质粒间孔和裂缝作为岩溶水的输导介质,形成所谓的非受限管道与受限管道,从而控制了不同成岩期岩石的喀斯特形态特征,并强调不同成岩期碳酸盐岩孔渗性控制喀斯特缝洞发育模式。(2)重视不同地理环境对喀斯特化的影响,按地理环境可以分为岛屿、海岸型喀斯特和大陆型喀斯特2类:前者主要以与大气淡水透镜体相关的化学溶蚀为主,发育极具识别意义的侧翼边缘溶洞,但其影响是局部性的;后者以地表、地下河流的机械侵蚀为主,地下暗河沉积发育,其影响是区域性的。(3)重点关注目前国内涉及较少的早成岩期喀斯特的宏观与微观特征、判识标志以及溶蚀机理等研究成果。最后,结合四川盆地古生界多个层位类似早成岩期喀斯特的发现与识别,分析总结早成岩期喀斯特型储集层发育及分布特征,以期今后对类似喀斯特现象的发现、识别以及相关储集层的勘探提供参考与借鉴。

关键词: 喀斯特, 控制因素, 地理环境, 溶蚀机理, 识别标志

Abstract:

Based on the discovery of the karst differentiations of several carbonate layers with different lithofacies in Sichuan Basin,present research advance of eogenetic karstification abroad is collected and collated in this paper.(1)The karst host rocks can be divided into two types,namely eogenetic rock with high porosity-permeability and telogenetic rock with low porosity-permeability or with even totally compacted. The two type rocks mainly use the intergranular pores and the fracture for karst water transferring,respectively,and accordingly the so-called unconfined conduit and confined conduit develop. The whole process dominates the karst morphology of carbonate rocks during different diagenetic periods. It can be concluded that the porosity and permeability of carbonate rocks in different diagenetic periods control the development model of karst fissure and cave.(2)More attention should be given to the impact on the karstification by the geographical settings. The karstification type can be divided into island- and coastal-typed and continental typed. The former is mainly related to chemical dissolution associated with meteoroic lens,developing flank margin caves which can be regarded as identification marks for island- and coastal-typed karst,but with minor influence on the whole. The latter,on the contrast,mechanically interacts with underground and surface water,with mass underground river deposition and large influence on the range and depth.(3)We follow with interest of the related latest achievements for eogenetic karst investigation,such as the macro- and micro-characteristics,identification marks,and dissolution mechanism of eogenetic karstification,which poorly reported domestically. Finally,for multiple carbonate layers found in Paleozoic are pervasively featured by likely eogenetic karst in Sichuan Basin,it analyzes and concludes the development and distribution characteristics of eogenetic karst reservoir. The results may offer reference for the discovery,recognition for the similar karst,and also the exploration of related reservoir in future.

Key words: karst, controlling factor, geographical setting, dissolution mechanism, identification mark

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