Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (4): 990-1006.doi: 10.13278/j.cnki.jjuese.201704103

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Characteristics and Controlling Factors on Physical Properties of Deep Buried Favorable Reservoirs of the Qingshuihe Formation in Muosuowan Area, Junggar Basin

Gao Chonglong1,2, Ji Youliang1,2, Jin Jun3, Wang Jian3, Ren Ying1,2, Che Shiqi4, Wang Ru1,2, Huan Zhijun1,2   

  1. 1. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
    3. Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    4. Sinopec Chongqing Fuling Shale Gas Exploration and Development Co., LTD, Chongqing 408000, China
  • Received:2016-10-31 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by National Natural Science Founding of China (41672098) and CNPC Innovation Foundation (2014D-5006-0101)

Abstract: For the aim of revealing deep-buried Qingshuihe Formation (K1q) reservoir characteristics and the factors governing reservoir quality, formation test and related researches of regional burial history, paleo-temperature and depositional system were analyzed by casting thin section, SEM, physical properties, X-ray diffraction of clay minerals, together with well drilling-logging data. And on the basis of these data, diagenetic model was proposed. The results demonstrate that K1q reservoir has a typical characteristic of low composition maturity, high plastic lithic content, and high textural maturity. Although buried mostly deeper than 3 500 m, the reservoir still has a mean porosity of 15.47% and mean permeability of 226.6 mD, and the main pore types are intergranular pores. So the Qingshuihe Formation is a typically favorable reservoir with deep buried depth. Moreover, the overall reservoir diagenesis is characterized by medium compaction, strong dissolution and weak cementation. Despite the deep buried depth, the diagenetic stage still belongs to the stage A1 of middle diagenesis phase. For the controlling factors on physical properties, the thick mid-fine sandstones and mid-coarse sandstones originated from underwater distributary channels or mouth bars of regionally distributed braided river delta are the basis for the formation of favorable reservoirs. While during the processes of diagenesis, physical properties are mainly controlled by compaction resistance from earlier carbonate cements, chlorite coats on detrital grains and dissolution attributed to acidic diagenetic fluid in later period. In addition to the sedimentary and diagenesis factors above, formation overpressure is the key factor in preservation of reservoir physical properties, significantly reducing the strength of compaction under the condition of deep burial depth. In the meantime, geothermal gradient continuously decreased during the processes of diagenesis and even at present, which resulting in the delying of diagenesis processes and preservation of physical properties.

Key words: Junggar basin, Mosuowan area, Qingshuihe Formation, deep buried reservoirs, diagenesis characteristic, physical properties controlling factors

CLC Number: 

  • P618.13
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