The mechanism of the flowing ground water impacting on coalbed gas content

The hydrogeological condition affects the coalbed gas storage dramatically. In an area of stronger hydrodynamics, the coal has a lower gas content, while a higher gas content exists in an area of weaker hydrodynamics. Obviously, the flowing groundwater is harmful to coalbed gas preservation. But few researches focus on the mechanism of how the flowing water diminishes the coalbed gas content.Based on the phenomenon that the flowing groundwater not only makes coalbed gas content lower, but also fractionates the carbon isotope, this research puts forward an idea that it is the water solution that diminishes the coalbed gas content,rather than the water-driven action or the gas dissipation through cap rocks. Only water-soluble action can both fractionate the carbon isotope and lessen the coalbed gas content,and it is an efficient way to take gas away and affect the gas content.

作 者： QIN Shengfei SONG Yan TANG Xiuyi FU Guoyou   作者單位： QIN Shengfei,SONG Yan,FU Guoyou(Research Institute of Petroleum Exploration and Development, Petro China, Beijing 100083, China)

TANG Xiuyi(Anhui Science and Technology College, Huainan 232000, China) 

刊 名： 科學通報（英文版）  SCI 英文刊名： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005 50(z1)  分類號： P61  關鍵詞： coalbed methane   methane carbon isotope   groundwater   gas content   destruction   mechanism  

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