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Distribution and fractionation mechanism of stable carbon isotope of coalbed methane

Science china Earth Sciences 2006年第12期49卷 1252-1258页

作者： qin shengfei1, tang xiuyi2, song yan1 & wang hongyan3.1. research institute of petroleum exploration and development, Petro{3., beijing 100083. china 2. Anhui Science and Technology College, Huainan 23.000, {3. 3. Langfang Branch, research institute of petroleum exploration and development, Petro{3., Langfang 065007, {3. 1. research institute of petroleum{3. and development PetroChina Beijing 100083 China 2. Anhui Science and Technology College Huainan 232000 China 3. Langfang Branch Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China

The stable carbon isotope values of coalbed methane range widely, and also are gener- ally lighter than that of gases in normal coal-formed gas fields with similar coal rank. There exists strong carbon isotope fractionation in coalbed methane and it makes the carbon isotope value lighter. The correlation between the carbon isotope value and Ro in coalbed methane is less obvious. The coaly source rock maturity cannot be judged by coalbed methane carbon isotope value. The carbon isotopes of coalbed methane become lighter in much different degree due to the hydrodynamics. The stronger the hydrodynamics is, the lighter the CBM carbon isotopic value becomes. Many previous investigations indicated that the desorption-diffusion effects make the carbon isotope value of coalbed methane lighter. However, the explanation has encountered many problems. The authors of this arti- cle suggest that the flowing groundwater dissolution to free methane in coal seams and the free methane exchange with absorbed one is the carbon isotope fractionation mechanism in coalbed methane. The flowing groundwater in coal can easily take more 13.H4 away from free gas and com- paratively leave more 12CH4. This will make 12CH4 density in free gas comparatively higher than that in absorbed gas. The remaining 12CH4 in free gas then exchanges with the adsorbed methane in coal matrix. Some absorbed 13.H4 can be replaced and become free gas. Some free 12CH4 can be ab- sorbed again into coal matrix and become absorbed gas. Part of the newly replaced 13.H4 in free gas will also be taken away by water, leaving preferentially more 12CH4. The remaining 12CH4 in free gas will exchange again with adsorbed methane in the coal matrix. These processes occur all the time. Through accumulative effect, the 12CH4 will be greatly concentrated in coal. Thus, the stable carbon isotope of coalbed methane becomes dramatically lighter. Through simulation experiment on wa- ter-dissolved methane, it had been proved that the f

关键词： coalbed methane,methane stable carbon isotope,fractionation mechanism,accumulative effect.

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Pool-Forming Stages and Enrichment Models of Medium- to High-Rank Coalbed Methane

引用

Acta Geologica Sinica(English Edition) 2010年第6期84卷 1539-1546页

作者： song yan ZHAO Mengjun HONG Feng LIU Shaobo qin {3. wang hongyan petroleum Geology research and Laboratory Center Research Institute of Petroleum Exploration and Development CNPC Beijing 100083 China yangtze University Jingzhou Hubei 434023 China Langfang Branch of research institute of petroleum{3. and development CNPC Langfang Hebei 065007 China

The pool-forming mechanism of coalbed methane has its own *** this paper, based on studies on the typical coal-bearing basins in china,it is pointed out that the reservoir formation of medium- to high-rank coalbed methane has experienced three critical stages：the coalbed methane generation and adsorption stage,the coalbed adsorption capacity enhancement stage,and the coalbed methane desorption-diffusion and preservation *** regional tectonic evolution, hydrodynamic conditions and sealing conditions play important roles in the stage of coalbed methane desorption-diffusion and ***- to high-rank coalbed methane has three types of enrichment models,that is,the most favorable,the relatively favorable,and the unfavorable enrichment models.

关键词： coalbed methane reservoir mechanism structure hydrodynamic model

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