CHARACTERISTICS OF CARBON ISOTOPE COMPOSITION FROM SECONDARY BIOGENIC GAS IN COALBED GASES--TAKING THE HUAINAN COAL FIELD AS AN EXAMPLE
-
摘要: 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δ13C1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δ13C1值明显轻于我国热成因煤型气和世界主要地区煤层气的δ13C1值,表现出了含次生生物成因煤层气的δ13C1值的变化特征;而δ13C2值明显与我国热成因煤型气和世界主要地区煤层气的δ13C2值处于同一分布范围,表现出了热成因气δ13C2值的特征。淮南煤田煤层气的δ13CCO2值反映出煤层气中的CO2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CO2。Abstract: Coalbed gases in Huainan coal field is a gas mixture resulted from thermogenic methane and secondary biogenic gas.And the δ13C1 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 δ13C1 and δ13C2 values,it is showed that the δ13C1 value from Huainan coal field is much smaller.The variational property of δ13C1 value is characterized by containing secondary biogenic gas.However,the distribution of δ13C2 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 δ13CCO2 value of coalbed gases,we can inferred that CO2 in methane is mainly resulted from coal pyrolysis,and part of it is the remaining CO2 from microbial reduction occurring in the secondary biogenic gas generating process.
-
Key words:
- carbon isotope composition /
- secondary biogenic gas /
- coalbed gases /
- Huainan coal field
-
[1] Scott A R.Composition and origin of coalbed gases from selected basins in the United States[J].International Coalbed Methane Symposium Proceedings,93.207-222 [2] 陶明信.煤层气地球化学研究现状与发展趋势[J].自然科学进展,2005,15(6):618-652 [3] Scott A R,Kaiser W R,Ayers W B,et al.Thermogenic and secondary biogenic gases,San Juan Basin[J].AAPG Bulletin,1994,78(8):1186-1209 [4] 陶明信,王万春,解光新等.中国部分煤田发现的次生生物成因煤层气[J].科学通报,2005,50(增刊):14-18 [5] Rightmire C T,Eddy G E,Kirr J N.Coalbed methane resources of the United States[A].In:AAPG Studies in Geology Series#17,Ⅶ-Ⅷ[G].Tulsa:AAPG,1984.1-14 [6] Rice D D.Composition and Origins of Coalbed Gas[A].In:Law B E,Rice D D,eds.AAPG Studies in Geology Series#38:Hydrocarbon from Coal[G].Tulsa:AAPG,1993.159-183 [7] Whiticar M J,Faber E,Schoell M.Biogenic Methane Formation in Marine and Freshwater Environments:CO2 Reduction VS.Acetate Fermentation-Isotopic evidence[J].Geochimica et Cosmochimica Acta,1986,50:693-709 [8] Kotarba M J,Rice D D.Composition and origin of coalbed gases in the Lower Silesian,southwest Poland[J].Applied Geochemistry,2001,16:895-910 [9] 张新民,李建武,韩保山等.淮南煤田煤层气藏划分及形成机制[J].科学通报,2005,50(增刊):6-13 [10] 张小军,陶明信,解光新等.淮南煤田次生生物成因气的比例及资源意义[J].沉积学报,2007,25(2):314-318 [11] 刘洪林,李贵中,王红岩等.西北低煤阶盆地生物成因煤层气成藏模拟研究[J].石油实验地质,2006,28(6):600-603 [12] 戴金星.中国天然气地质学(卷一)[M].北京:石油工业出版社,1992 [13] 徐永昌.天然气成因理论及应用[M].北京:科学出版社,1994 [14] 戴金星,钟宁宁,刘德汉等.中国煤成大中型气田地质基础和主控因素[M].北京:石油工业出版社,2000.11-23 [15] 刘文汇,徐永昌.煤型气碳同位素演化二阶段分馏模式及机理[J].地球化学,1999,28(4):359-365 [16] 刚文哲,高岗,郝石生等.论乙烷碳同位素在天然气成因类型研究中的应用[J].石油实验地质,1997,19(2):164-167 [17] Kotarba M.Geochemical criteria for the origin of natural gases accumulated in the Upper Carboniferous coal-seam-bearing formations in Walbrzych Coal Basin (in Polish with English summary)[J].Stanislaw Staszi Academy of Mining and Metallurgy Scientific Bulletin,1988,1199:119 [18] Kotarba M J.Isotopic geochemistry and habitat of the natural gases from the Upper Carboniferous ZacIer Coal-bearing Formation in the Nowa Ruda Coal District (Lower Silesia,Poland)[J].Organic Geochemistry,1990,16 (1-3):549-560 [19] Aravena R,Harrison S M,Barker J F,et al.Origin of methane in the Elk Valley coalfield,southeastern British Columbia,Canada[J].Chemical Geology,2003,195,219-227 [20] Hosgormez H,Yalcin M N,Cramer B,et al.Isotopic and molecular composition of coal-bed gas in the Amasra region (Zonguldak basin-western Black Sea)[J].Organic Geochemistry,2002,33:1429-1439 [21] Kotarba M J.Composition and origin of coalbed gases in the Upper Silesian and Lublin basins,Poland[J].Organic Geochemistry,2001,32:163-180 [22] Smith J W,Pallasser R J.Microbial origin of Australian coalbed methane[J].AAPG Bulletin,1996,80 (6):891-897 [23] 张建博,陶明信.煤层甲烷碳同位素在煤层气勘探中的地质意义——以沁水盆地为例[J].沉积学报,2000,18(4):611-614 [24] 戴金星,戚厚发,宋岩.我国煤层气组分、碳同位素类型及其成因和意义[J].中国科学(B辑),1986,12:1317-1326 [25] 胡国艺,刘顺生,李景明.沁水盆地晋城地区煤层气成因[J].石油与天然气地质,2001,22(4):319-321 [26] 戴金星.天然气碳氢同位素特征和各类天然气鉴别[J].天然气地球科学,1993,(2-3):1-40 [27] 罗霞,刘华,王玉林等.渤海湾盆地济阳坳陷气源岩和原油生物模拟实验研究[J].石油实验地质,2007,29(4):426-431
点击查看大图
计量
- 文章访问数: 1594
- HTML全文浏览量: 45
- PDF下载量: 930
- 被引次数: 0