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《Earth Science(Journal of China University of Geosciences)》 2013-01
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Carbon and Hydrogen Isotopic Compositions and Their Evolutions of Gases Generated by Forest Marsh Peat at Different Thermal Maturity Stages

DUAN Yi 1,WU Ying-zhong 1,YAO Jing-li 2,LIU Xian-yang 2,SUN Tao 1,HE Jin-xian 1,XU Li 1,XIA Jia 1,ZHANG Xiao-li 1 1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China 2.Exploration and Development Institute of Changqing Oilfield Company,CNPC,Xi'an710021,China  
Coalbed methane(CBM)accumulation models include continuous gas accumulation and staged gas accumulation.However,the study on geochemistry characteristics and evaluation index of staged accumulation CBM is inadequate.This study has obtained the carbon and hydrogen isotopic compositions and their evolution laws of methane and ethane generated at different evolution stages by thermal simulation of samples prepared using a forest marsh peat at different temperatures.The data show that the carbon and hydrogen isotopic compositions tend to increase heavy isotope with increasing evolution level of the starting sample.At the same time,it is found that the maturity level of the starting sample influences the carbon isotopic compositions of methane and ethane,while maturity of gases affects their hydrogen isotopic compositions.The relationship between R o values and the carbon and hydrogen isotopic compositions of gases generated by coal-forming organic matter at different evolution stages as well as the carbon or hydrogen isotopic relationship between methane and ethane are established.These results provide scientific evidence for studying the genesis of CBM generated at different maturity intervals and understanding the geochemistry characteristics of staged accumulation CBM,and they were applied to study on CBM from the southern Qinshui basin,and it is found that it accumulated after Middle Jurassic and is characterized by staged gas accumulation,which indicates that the results of thermal simulation experiments are very important for judging the genesis of natural CBM.
【Fund】: 国家自然科学基金(Nos.40872092 41272125 40772069);; 国家“973”项目(No.2005CB422105)
【CateGory Index】: P618.13
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