Carbonate sedimentary microfacies characteristic and evolution of the Middle and Lower Ordovician in northwestern of Tarim Basin

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  • 1.Exploration and Development Research Institute,Geo-jade Petroleum Corporation,Beijing 100016,China;  
    2.School of Ocean Sciences,China University of Geosciences,Beijing 100083,China; 
    3.Petroleum Exploration & Production Institute,China National Petroleum Corporation,Korla 841000,China

Received date: 2018-06-24

  Revised date: 2018-07-17

  Online published: 2019-08-27

Abstract

The carbonate sedimentary microfacies characteristic and evolution model of the Middle and Lower Ordovician have been established through the field work of Bachudabantage,Bachudawuzitage,Kepingshuinichang outcrop as well as abundant hand specimen and slice observation in the northwestern of Tarim Basin. Based on macro sedimentary structure and micro characteristics,11 kinds of limestone microfacies and 6 kinds of dolomite microfacies have been identified. Different microfacies were combined into 7 kinds of microfacies combination with particular facies sequence to reflect the specific sedimentary environment and reef building characteristic,which contains high energy thick-bedded platform edge shallow reef,tidal flat intraclast beach,open platform intraclast shoal,moderate-low energy thin-interbedded intraclast beach and interbank sea,open platform bioclastic beach,low energy thin-bedded interbank sea,arid and semi-arid climate thick bedded restricted platform dolomite tidal sequence. The study area mainly changes from restricted platform,dolomite tidal to open platform and platform margin with large set of shoal and reef development. Based on the discussion above,platform margin reef and shoal,inner shoal and dolomitic flat are the favorable reservoir facies belts to breakthrough in priority.

Cite this article

Wang Qing-long, Lin Chang-song, Li Hao, Han Jian-fa, Sun Yan-da, He Hai-quan . Carbonate sedimentary microfacies characteristic and evolution of the Middle and Lower Ordovician in northwestern of Tarim Basin[J]. Natural Gas Geoscience, 2018 , 29(9) : 1274 -1288 . DOI: 10.11764/j.issn.1672-1926.2018.07.004

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