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The Dynamic–Change Laws of the Porosity and Permeability of Low– to Medium–Rank Coals under Heating and Pressuri-zation Treatments in the Eastern Junggar Basin, China

Gang Wang 1, 2, Yong Qin *1, Jian Shen1, Shuyuan Chen1, Beibei Han3, Xiaoting Zhou4
1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China 2. Key Laboratory of Resource Survey and Research of Hebei Province, Hebei University of Engineering, Handan 056038, China 3. China Chemical Geology and Mine Bureau, Beijing 100013, China 4. Institute of Technology, Esat China Jiao Tong University, Nanchang 330100, China

ABSTRACT: Deep coalbed methane exists in high–temperature and high–pressure reservoirs. To elucidate the dynamic–change laws of the deep coal reservoir porosity and permeability characteristics in the process of coalbed methane production, based on three pieces of low– to medium–rank coal samples in the eastern Junggar Basin, Xin Jiang, we analyse their mercury–injection pore structures. We measured the porosity and permeability of the coal samples at various temperatures and confining pressures by high–temperature and confining pressure testing. The results show that the porosity of a coal sample decreases exponentially with increasing effective stress. With increasing temperature, the initial porosity increases for two pieces of relatively low–rank coal samples. The increased rate of porosity decreases with increasing confining pressure. With increasing temperature, the initial porosity of a relatively high–rank coal sample decreases, and the rate of change of the porosity become faster. An exponential relationship exists between the porosity and permeability. With increasing coal rank, the initial porosity and permeability decrease. The change rate of the permeability decreases with increasing porosity.

Keywords:high–temperature and confining pressure, coalbed methane reservoir, porosity, permeability, dynamic change.

DOI:
10.1007/s12583-017-0908-4
CLC number:
U469.72
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