Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (1): 36-44.

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Sequence-based lithofacies paleogeography and sand body distribution of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin

DUAN Yue1， HOU Changbing2， ZHENG Rongcai1， WANG Haihong2， WANG Changyong1   

  1. 1. Institute of Sedimentary Geology， Chengdu University of Technology， Chengdu 610059， China； 2. The Fourth Section of Ultra-low Permeability Reservoirs， PetroChina Changqing Oilfield Company， Qingyang 745100， Gansu， China
  • Online:2014-02-05 Published:2014-02-05

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Abstract:

The Chang 8 oil reservoir set is one of the important reservoirs in Zhenyuan area, Ordos Basin. Based on core observation, well logging and analytical data and previous research results, this paper studied the sedimentary facies of Chang 8 oil reservoir set. The Chang 8 oil reservoir set was deposited by shallow-water braided river delta. Microfacies such as main channels, distributary channel, crevasse splay, underwater distributary channel, interdistributary estuary, depression, mouth bar and distal bar were identified. According to the fine high resolution sequence and stratigraphic framework, we compiled the sequence-based lithofacies palaeogeography maps on the basis of the short-term base cyclic units which were equal to a sublayer sand body, and analyzed the causes, assemblage, distribution and evolution of various types of sand bodies. The results can provide fine depositional and sequence data for the reservoir prediction and efficient exploration and development of the lithologic reservoirs of Chang 8 oilreservoir set in the study area.

Key words: epicontinental offshore lake, hydrothermal exhalative, sedimentary environment, Fengcheng Formation, Junggar Basin

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