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JIANG Tianhao, SONG Fangxin, DENG Baokang, et al. Sedimentary Microfacies of Chang 6 Oil-Bearing Formation and Its Control on Reservoir in Wuqi Oilfield, Ordos Basin[J]. Northwestern Geology, 2020, 53(4): 130-139. DOI: 10.19751/j.cnki.61-1149/p.2020.04.012
Citation: JIANG Tianhao, SONG Fangxin, DENG Baokang, et al. Sedimentary Microfacies of Chang 6 Oil-Bearing Formation and Its Control on Reservoir in Wuqi Oilfield, Ordos Basin[J]. Northwestern Geology, 2020, 53(4): 130-139. DOI: 10.19751/j.cnki.61-1149/p.2020.04.012
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Sedimentary Microfacies of Chang 6 Oil-Bearing Formation and Its Control on Reservoir in Wuqi Oilfield, Ordos Basin

  • 1. No. 10 Oil Production Plant, Changqing Oilfield Company, Petro China, Qingyang 745100, Gansu, China;

  • 2. Sichuan OGT Technology Development of Oilfield Co., Ltd., Chengdu 610041, Sichuan, China

More Information
  • Received Date: August 09, 2019
  • Revised Date: April 11, 2020
  • Available Online: July 28, 2022
  • Published Date: December 04, 2020
    Graphical Abstract
    • Abstract
  • It is of great significance to re-recognize the characteristics of the sedimentary microfacies and sand body distribution in the middle and late stage of waterflood development for accurately locating remaining oil, adjusting development well pattern and improving water drive recovery. The authors studied in details the sedimentary microfacies of Chang 6 reservoir in Wuqi oilfield based on the core observation, thin section identification and well logging analysis. It is made clear that Chang 6 oil-bearing formation in the study area belongs to delta front subfacies and three sedimentary microfacies, namely underwater distributary channel, distributary Bay and channel flank. The authors classified the reservoir in the study area using 10 selected influencing parameters and drew out the plan of sedimentary microfacies and the map of reservoir classification, thus quantitatively evaluated the controlling effect of sedimentary microfacies on the reservoir. The results show that the Chang 61 and Chang 62 have good inheritance, and the underwater distributary channel of sand body is well developed. The oil and gas are mainly concentrated in the sand body of Chang 61 and Chang 62 underwater distributary channel and the combined sand body of underwater distributary channel and channel flank. The pore structure types of Chang 6 reservoir can be divided into three types. Type I and Ⅱ are mainly developed in the microfacies of underwater distributary channel, the pore structure parameters being preferable to developing in the future. Type Ⅲ is the most compact with poor structure parameters and low development value. The above three types in Chang 61 and Chang 62are well-developed, among which type I and type Ⅱ reservoirs are the largest in distribution quantity and scale. The reservoir classification and evaluation map of each small layer provide a basis for accurate positioning of remaining oil and the adjustment of potential exploration plan.
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