Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 608-616.doi: 10.13278/j.cnki.jjuese.20190252

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Stress Sensitivity and Prediction of Irreducible Water Saturation in Coal Reservoirs in Baode and Hancheng Blocks Based on Low-Field Nuclear Magnetic Resonance

Hou Wei1, Zhao Tiantian2,3, Zhang Lei1, Xiong Xianyue1, Xu Hao2,3, Chao Haiyan1, Zhang Wei1, Wang Wei1, Zhang Hui1   

  1. 1. Petrochina Coalbed Methane Company Limited, Beijing 100028, China;
    2. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    3. State Key Laboratory of Coal Reservoir of National Engineering Research Center of Coalbed Methane Development&Utilization, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2019-11-20 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by Key Project of National Science & Technology, China (2016ZX05042-002) and Major Science and Technology Projects of China National Petroleum Corporation (2017E-1405)

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Abstract: The stress change has an important influence on the irreducible water saturation in the process of coalbed methane development. A series of nuclear magnetic resonance (NMR) experiments were performed on the coal samples from different rank coal reservoirs, the T2 cut-off value was calibrated by the empirical determination method of spectral pattern,the variation of irreducible water saturation with stress in different coal rank reservoirs was evaluated, and further, its dynamic changes with the development of coalbed methane in the study area were also predicted. The experimental results show that the irreducible water saturation has a strong stress sensitivity, and its change is the strongest at the initial stage of effective stress increase. Due to the difference of pore structure, the stress sensitivity is more intense in Baode block. The predicting result in Baode block shows that the total variation of initial irreducible water saturation affected by buried depth is smaller than that in Hancheng block because of the small variation range of buried depth in Baode block. In the process of coalbed methane development, the irreducible water saturation of shallow buried reservoirs has a stronger stress sensitivity, but the overall increase is basically the same at the end of the development process.

Key words: coal reservoir, low-field nuclear magnetic, irreducible water saturation, stress response, coalbed methane, developing dynamic

CLC Number: 

  • P618.13
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