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FMI Facies Research in the Karst Reservoir of the Middle-Lower Ordovician Yingshan Formation in the Northern Slope of Tazhong Area

GENG Xiao-jie,LIN Chang-song,HAN Jian-fa,YIN Hong,LI Hao,YANG Zhao-shuan,WANG Qing-long   

  1.  
    (1.School of Energy Resources,China University of Geosciences,Beijing 100083,China;
    2.School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;
    3.Tarim Oilfield Company,PetroChina,Korla 841000,China)
     
  • Received:2014-04-23 Revised:2014-07-29 Online:2015-02-10 Published:2015-02-10

Abstract:

FMI (Formation Micro-Scanner Image) is widely used to analyze reservoir properties with the advantages of high resolution,visible and quantified.In this study,11 FMI facies are classified based on the combination of borehole images,cores,thin sections and open-hole logs.It includes reservoir types like carves and tectonic fractures,sedimentary interlayer types like high resistivity facies and two compound facies of fractures and holes.Besides description of karst systems in borehole images,anomalies in GR curve attracting the researchers are analyzed by FMI images.It shows that compound facies of fractures and holes could be effective reservoir instead of caves with high GR value because oil/gas-bearing holes are connected by fractures.Two suites of karst system were formed in the OY1 while small scale caves and holes were formed in the OY2 because of lithological and structure locations.The results of this study demonstrated that,uncomformity and tectonic geomorphology control the differences of the paleokarst system.

Key words: FMI facies, Northern slope of Tazhong area, Yingshan Formation, Karst related reservoir

CLC Number: 

  • TE122.2+3
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