CAJ | 학술논문

淮南煤田煤层气属于热成因和次生生物成因气的混合气.不同矿区和不同煤层中煤层气的δ~(13)C_1值有明显的不同,这主要是由于现今淮南煤田的煤层气藏中后期生成的次生生物气与残留在煤层中的热解气混合比例不同造成的.研究显示,淮南煤田煤层气的δ~(13)C_1值明显轻于我国热成因煤型气和世界主要地区煤层气的δ~(13)C_1值,表现出了含次生生物成因煤层气的δ~(13)C_1值的变化特征;而δ~(13)C_2值明显与我国热成因煤型气和世界主要地区煤层气的δ~(13)C_2值处于同一分布范围,表现出了热成因气δ~(13)C_2值的特征.淮南煤田煤层气的δ~(13)C_(CO_2)值反映出煤层气中的CO_2主要为煤热解而来,部分是次生生物气生成过程中,经过了微生物的还原作用而残留的CO_2.
회남매전매층기속우열성인화차생생물성인기적혼합기.불동광구화불동매층중매층기적δ~(13)C_1치유명현적불동,저주요시유우현금회남매전적매층기장중후기생성적차생생물기여잔류재매층중적열해기혼합비례불동조성적.연구현시,회남매전매층기적δ~(13)C_1치명현경우아국열성인매형기화세계주요지구매층기적δ~(13)C_1치,표현출료함차생생물성인매층기적δ~(13)C_1치적변화특정;이δ~(13)C_2치명현여아국열성인매형기화세계주요지구매층기적δ~(13)C_2치처우동일분포범위,표현출료열성인기δ~(13)C_2치적특정.회남매전매층기적δ~(13)C_(CO_2)치반영출매층기중적CO_2주요위매열해이래,부분시차생생물기생성과정중,경과료미생물적환원작용이잔류적CO_2.
Coalbed gases in Huainan coal field is a gas mixture resulted from thermogenic methane and secondary biogenic gas. And the δ~(13)C_1 value of coalbed gases is very different among different mines and coal beds. This is mainly because the difference of mixing proportion between the remaining pyrolysis gas from coalbed and the secondary biogenic gas from post-stage in Huainan coal field. Compared with Chinese thermogenic coalbed gases and others from the world's major regions by δ~(13)C_1 and δ~(13)C_2 values, it is showed that the δ~(13)C_1 value from Huainan coal field is much smaller. The variational property of δ~(13)C_1 value is characterized by containing secondary biogenic gas. However, the distribution of δ~(13)C_2 value in Huainan coal field is obviously in same position with the one that from Chinese thermogenic coalbed gases and the world's major regions, and it is characterized by property of thermogenic methane. And from the δ~(13)C_(CO_2) value of coalbed gases, we can inferred that CO_2 in methane is mainly resulted from coal pyrolysis, and part of it is the remaining CO_2 from microbial reduction occurring in the secondary biogenic gas generating process.