Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 62-72.doi: 10.12108/yxyqc.20200606

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Spatio-temporal distribution of soft-sediment deformation structures on slope: a case study of Chang 7 oil reservoir in Zhenyuan area，Ordos Basin

HE Weiling1, LUO Shunshe2, LI Yudong3, WU You1, LYU Qiqi1, XI Mingli4   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas(Yangtze University), Wuhan 430100, China;
    3. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China;
    4. Department of Development, PetroChina Changqing Oilfield Company, Xi'an 745000, China
  • Received:2020-02-14 Revised:2020-03-01 Online:2020-12-01 Published:2020-10-30

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Abstract: In order to study the spatio-temporal distribution of soft-sediment deformation structures of Chang 7 oil reservoir of Upper Triassic Yanchang Formation,the detailed observation and description of core from 20 wells in Zhenyuan area,southwestern Ordos Basin,were carried out. Combined with morphological characteristics and formation mechanism of the soft-sediment deformation structures,seven common types of soft-sediment deformation structures were recognized,including slump deformation,liquefied curled deformation,torn mud intraclasts,liquefaction sandstone dikes,sandy ball-pillow structures,flame structures and load casts. Vertically,softsediment deformation structures are most frequently observed in Chang 72 sublayer,followed by Chang 71 and Chang 73 sublayers. Horizontally,the soft-sediment deformation structures mainly distribute in the deep-water slope-break zone and semi-deep and deep lake where is located in the central and eastern of the study area. The formation mechanism and distribution of soft-sediment deformation structures on slope is that:(1)Basin-mountain coupling has activated triggers for the occurrence of soft-sediment deformation structures.(2)The transition period between the lake transgression and lake regression is the stage when the soft-sediment deformation structures are most concentrated.(3)The distribution of the soft-sediment deformation structures is closely related to the development of slope break zone. From the slope to the semi-deep lake-deep lake environment,various types of softsediment deformation structures have evolved regularly. The results of this study have important reference for the distribution pattern of sedimentary deformation structures,the prediction of gravity flow sand body distribution and the study of sedimentary events.

Key words: soft-sediment deformation structures, flame structure, Distribution pattern, Chang 7 oil reservoir, Ordos Basin

CLC Number: 

  • TE121.3+2
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