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Geochemical characteristics and genesis of coalbed methane in China

SONG Yan1,2 LIU Shaobo1 HONG Feng1 QIN Shengfei1(1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China; 2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China)  
Geochemical characteristics and genesis of coalbed methane(CBM) are significant for understanding formation and distribution law of CBM reservoir and evaluating CBM resources.Hydrocarbon generation and post-transformation of coal have important effect on CBM chemical composition,carbon isotope and other geochemical characteristics.Therefore the genesis can be determined according to the geochemical characteristics.The paper analyzes CBM geochemical characteristics with a number of CBM component and its carbon isotope data,explores the variation law of geochemical characteristics of native CBM combined with coal evolution process,and investigates the impacts of secondary action on the CBM geochemical characteristics based on type of coal post-transformation.As a result,it points out that post-transformation process,mainly including desorption,secondary biological action and water-soluble effects,greatly affect the CBM geochemical characteristics.
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