Research progress in studies on the coalbed gas geochemistry  

作　　者：TAO Mingxin 

机构地区：[1]College of Resources Sciences ＆ Technology, Beijing Normal University, Beijing 100875, China [2]Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics. Chinese Academy of Sciences, Lanzhou 730000, China

出　　处：《Progress in Natural Science:Materials International》2006年第3期215-220,共6页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No.40372065)the Major State Basic Research Development Program of China (Grant No.2002CB211701)

摘　　要：The current situation of geochemical studies on coalbed gas is reviewed in this paper. Generally, coalbed gas is composi tionally dominated by methane with δ^13C1 values ranging approximately from - 80‰ to - 10‰. However, few isotopic studies have been carried out on other components of coalbed gas except for hydrogen and carbon dioxide, whose δDCH4 values available for utilization vary from - 333‰ to 117‰, and δ^13Cco2 values from - 29.4‰ to ＋ 18.6‰. Two major types of coalbed gas, thermogenic gas and secondary biogenic gas, have been identified, and there are also some other classification criteria. Compared with conventional natural gases, coalbed gas has a wide distribution range of δ^13C1 and δ^13Cco2 values, especially possessing some extremely heavy values. Current problems that remain unsolved in the coalbed gas geochemistry include the variation mechanism, controlling factors and application of carbon and hydrogen isotopes of methane, the relation between the values of δ^13C1 and Ro, the systematic classification scheme and criterion of genetic types, and the application of the coalbed gas geochemistry in evaluating target districts of the coalbed gas exploration.

关 键 词：coalbed gas GEOCHEMISTRY isotopic composition genetic type novel resource. 

分 类 号：P618.11[天文地球—矿床学]