Diagenetic environments of Ordovician carbonate rocks in Yuqi area,northern Tarim Basin:Evidence from fluid inclusion analysis

  • Yuriy Tyapkin ,
  • Iana Mendrii
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  • 1.Lanzhou Center for Oil&Gas Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;2.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China;3. Sbhool of Geosciences,Yangtze University,Wuhan 430100,China

Online published: 2013-10-08

Abstract

Abstract:The Ordovician carbonate rock is one of the principal producing formations in Yuqi area,northern Tarim
Basin.Through the use of fluid inclusion technology,this paper discussed the diagenetic environment and stages of
Ordovician carbonate reservoir from the aspects of petrography characteristics,homogenization temperature and salinity.
The result shows that three groups of saline water inclusions were detected in pore filling calcite,and the fluid evolutionary
trends is I c(1ow temperature and high salinity) ⅡA_H(middle temperature and low to middle salinity) ⅢA(high
temperature and low salinity);there are two episodes offluid activities in fracture filling calcite:II A_H(middle temperature
and low to middle salinity)and lI B—c(middle temperature and middle to high salinity),and both of their salinity decrease
with homogenization temperature increase.Combined with burial history and saline water inclusions research in Yuqi area,the evolution of diagenetie environments was determined to trend from marine to continental diagenetic environment.
During Caledonian·early Hercynian stage,Yuqi area experienced exposure palaeokarst,and subsequently buried with
the Meso·Cenozoic deposition,which constitutes a diagenetie evolution of a mid open—type system.

Cite this article

Yuriy Tyapkin , Iana Mendrii . Diagenetic environments of Ordovician carbonate rocks in Yuqi area,northern Tarim Basin:Evidence from fluid inclusion analysis[J]. Lithologic Reservoirs, 2013 , 25(4) : 38 -43 . DOI: 10.3969/j.issn.1673-8926.2013.04.008

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