Lithologic Reservoirs ›› 2010, Vol. 22 ›› Issue (1): 43-47.doi: 10.3969/j.issn.1673-8926.2010.01.008

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Sedimentary facies of Chang 2 oil-bearing member of Yanchang Formation in Yanchi-Dingbian area, Ordos Basin

CHEN Fei1，WEI Dengfeng2，YU Xiaolei1，WU Shaobo1   

  1. 1. School of Petroleum Resources， Xi’an Shiyou University， Xi’an 710065， China； 2. Qilicun Oil Production Plant， Yanchang Oilfield Company Ltd.， Yan’an 717100， China
  • Online:2010-03-15 Published:2010-03-15

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Abstract:

Based on drilling cores and logging data, the sedimentary facies and its evolution characteristics of Chang 2 oil-bearing member in Yanchi-Dingbian area, Ordos Basin are studied. The result shows that fluvial system developed in Chang 2 depositional stage in this region. During the depositional period, there is a systematic change in channel types from meandering stream to anastomosing river. The meandering stream deposition developed at the bottom and middle sections （Chang 23, Chang 22） ofChang 2 member with thicker superposed channel sand body, higher sand-stone/ stratum ration, less floodplain and more channel deposits. While the anastomosing river deposition developed at the top section （Chang 21） of Chang 2 member with thinner channel sandstone-body, lower sandstone/stratum ration, less channel and more floodplain, swamp deposits. On the basis of sedimentary units division and correlation, the microfacies plane distributions of the 4 units are analyzed.

Key words: subaqueous fan, reservoir characteristics, controlling factor, Shuangyang Formation, Moliqing Fault Depression

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