Microfacies Characteristics and Depositional Evolution of the Lower Ordovician Yingshan Formation in North Slope of Tazhong Area,Tarim Basin

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  • 1.School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;
    2.School of Energy Resources,China University of Geosciences,Beijing 100083,China;
    3.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2014-07-09

  Revised date: 2014-08-28

  Online published: 2015-02-10

Abstract

The depositional microfacies of carbonate illustrate the feature of the depositional water energy and environment.Additionally,microfacies are the fundamental of pore space development and facilitate the formation of favorable reservoirs.Ten depositional microfacies (Mf1-Mf10) and four microfacies patterns (MA1-MA4) are recognized in Yingshan Formation,the northern slope of central Tarim Basin,through a large number of thin-sections and cores.The microfacies patterns are distributed horizontally along with the Tazhong No.1 fault zone.High-energy to medium-to-high-energy depositional patterns developed beside the boundary of platform (i.e.MA1 and MA2).However,the microfacies patterns in the inner platform indicate the decrease of water-energy to the central basin.Two microfacies patterns,including medium-to-low-energy tidal flat (MA3) and low-energy-dolomitic tidal flat (MA4),have been suggested in the inner platform.Medium-to-low-energy microfacies patterns transform to medium-to-high-energy microfacies patterns from Yingshan 2nd to Yingshan 1st.During the late stage of Yingshan 1st,which is the main stage for forming carbonate shoals,the depositional water energy gradually increased from the bottom to the top.The high energy microfacies which were on the top of Yingshan Formation,were the primitive material for favorable reservoir,because they formed several types of pores,and developed structural fractures and karstification more easily.

Cite this article

REN Ping,LIN Chang-son,HAN Jian-fa,LI Hao,LIU Jing-yan,WANG Qing-long . Microfacies Characteristics and Depositional Evolution of the Lower Ordovician Yingshan Formation in North Slope of Tazhong Area,Tarim Basin[J]. Natural Gas Geoscience, 2015 , 26(2) : 241 -251 . DOI: 10.11764/j.issn.1672-1926.2015.02.0241

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