Ordovician Paleokarst Cave System and It′s Controlling Factor in Xekar,Tarim Basin

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  • 1.Research Institution of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.University of China Petroleum (Beijing),Beijing 102249,China

Received date: 2013-04-16

  Revised date: 2013-08-06

  Online published: 2014-02-10

Abstract

Based on the outcrop and satellite image,this paper discussed the characteristics of Ordovician cave system and its main controlling factors in Xekar,Tarim Basin.As paleokarst cave system was distributed grouped and layered,view of cavern system groups is put forward.And cavern system groups of the research area were divided into a single fracture-cavity system and cavern group system based on the detailed observation of cavern fillings.On the planar,the shape of single fracture-cavern was as single hole and hall,but the shape of cavern group was the combination of multiple single cave system.On the cross section,cavern system group is the combination of multiple single cave system distributed into a layer regularly.Different karst caves were connected by multiple scale fractures,in which shape of a single cavity body is mainly circular,elliptic and lenticular.With the analysis of fracture-cavern shape and their distribution characteristics,also various geochemical analysis data,such as carbon and oxygen isotopes,strontium isotope (87Sr/86Sr),we conclude that the distribution of paleokarst cave system in study area is dominated by climate,unconformity,channel system and fault system.Climate and unconformity are foundation for the development of fracture-cavity system,and the channel system and fault system,especially fault system,play significant role in later reformation of cave.The development model and mechanism of fracture-cavity system dominated by unconformity-channel system and the development process and model of fracture-cave dominated by facture system are generalized systematically,which is expected to provide theoretic basis for paleokarst cave system reservoir predication in the subarea of north Tarim Basin.
 

Cite this article

SHI Shu-yuan,HU Su-yun,LIU Wei,LIANG Dong-xing,QIAO Hui . Ordovician Paleokarst Cave System and It′s Controlling Factor in Xekar,Tarim Basin[J]. Natural Gas Geoscience, 2014 , 25(2) : 167 -177 . DOI: 10.11764/j.issn.1672-1926.2014.02.167

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