Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (3): 349-356.doi: 10.11743/ogg20130310

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Sedimentary characteristics of Yingcheng Formation in Sujiatun area, Lishu Rift in Songliao Basin

Yang Tebo1,2, Wang Hongyu2, Fan Tailiang2, Liu Zhenhua3, Hao Yuejuan2, Wei Yuan1, Yang Fan2   

  1. 1. Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710021, China;
    2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    3. School of Resources, Hebei Engineering University, Handan, Hebei 056038, China
  • Received:2012-06-12 Revised:2013-04-23 Online:2013-06-28 Published:2013-07-17

Abstract: The Yingcheng Formation in Sujiatun area,Lishu Rift in Songliao Basin,has good conditions for the formation of petroleum reservoirs.However,the level of research is low in this area.The paper is to identify favorable reservoir facies belt through study of sedimentary microfacies and sandstone reservoir conditions.The theories of sedimentoloy and high-resolution sequence stratigraphy were applied and the cores,mud logging,well logging,seismic data and palaeogeomorphology data were integrated.The study revealed that lacustrine and braided river delta sedimentary facies are predominant in the study area.Furthermore,eight sedimentary microfacies were identified,including distributary channel,underwater distributary channel,underwater interdistributary,month bar,distal bar,sheet-like sand,mudflats and bank bars.And the main characteristics of sandstones of sedimentary microfacies are described.The Yingcheng Formation was divided into 4 Members,6 fourth-order sequences and 7 sand groups.The sedimentary facies distribution and their temporal and spatial evolution of each sand group(SG) were discussed.The transgressive surface to maximum lake flooding surface occurred at the end of deposition of the Ying-1 Member (SG2),and the overlying SG3 is the most favorable reservoir.Analyses of plain distribution of sedimentary facies and reservoir reveal two main braided channels with good stacked distributary channel sand bodies and reservoir properties.The main braided channels in combination with late nose structure are the most favorable areas for the development of structural-lithologic traps and lithology traps.

Key words: sedimentary characteristics, lithologic trap, Yingcheng Formation, Sujiatun area, Lishu Rift, Songliao Basin

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