Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (4): 979-990.doi: 10.13278/j.cnki.jjuese.20190131

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Fracture Characteristics of Chang 6 Tight Oil Reservoir in Block Y in Ordos Basin

Kang Liming1,2, Ren Zhanli1, Zhang Lin3, Wei Bin2, Wang Wubing2   

  1. 1. Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    2. Shaanxi Yanchang Petroleum International Exploration & Development Engineering Co., Ltd., Xi'an 710075, China;
    3. CNPC Chuan-Qing Research Institute of Drilling Engineering Technology, Xi'an 710021, China
  • Received:2019-06-27 Online:2020-07-26 Published:2020-07-29
  • Supported by:
    Supported by National Natural Science Foundation of China(41630312) and National Science and Technology Major Project (2017ZX05005-002-008)

Abstract: Chang 6 is the main producing layer of Y block in Ordos basin, and cracks are developed. At present, the productivity of single well is low, water flooding and water channeling are serious, and some wells are seriously affected. In order to solve the fracture problem,the authors studied the development characteristics of natural fractures and artificial fractures, the influencing factors of artificial fractures, and the influencing factors of natural fractures on artificial fractures through the macroscopic and microcosmic observation of outcrops and cores in the field, the analysis of water injection indication curve, the analysis of pressure drop test data, the measurement of stress, and the analysis of the relationship between the pressure gradient of pump stop and the overlying stress gradient. Combined with the sedimentary environment, the influence of artificial fracture properties, artificial fracture form, and distribution law were studied. The results show that the macro-fractures of Chang 6 oil reservoir are mainly vertical regional structures, while the micro-fractures are mainly horizontal diagenetic fractures. The artificial fractures are mainly controlled by natural fractures, and the natural fractures are mainly controlled by the thickness and shale content of sand body. The thinner the sand body is, the easier the natural fracture is to form, the higher the shale content is, the easier the deformation structure is to form.

Key words: Ordos basin, Chang 6, tight oil reservoir, fracture characteristics

CLC Number: 

  • TE348
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