鄂尔多斯盆地延长组烃源岩中单甲基烷烃来源及意义

钱宇; 王作栋; 妥进才; 张婷; 贺永红

doi:10.11781/sysydz201701086

鄂尔多斯盆地延长组烃源岩中单甲基烷烃来源及意义

doi: 10.11781/sysydz201701086

钱宇^1,2,
王作栋^1, ,,
妥进才¹,
张婷^1,2,
贺永红³

1.
甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室, 兰州 730000
2. 中国科学院大学, 北京 100049
3. 陕西延长石油(集团)有限责任公司研究院, 西安 710000

基金项目: 国家自然科学基金（41602151，41672127）和兰州油气资源研究中心“十三五”创新基金（135CCJJ20160523）资助。

详细信息

作者简介:
钱宇(1988-),男,博士研究生,从事油气地球化学研究。E-mail:qianyu1001@sina.com。

通讯作者:
王作栋(1966-),男,高级工程师,从事油气地球化学研究。E-mail:wangzuo_dong@163.com。

中图分类号: TE122.113
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出版历程
- 收稿日期: 2016-06-01
- 修回日期: 2016-11-30
- 刊出日期: 2017-01-28

Origin and significance of monomethylalkanes from Yanchang Formation source rocks in Ordos Basin

1.
Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Research Institute of Shaanxi Yanchang Petroleum Group Ltd, Xi'an, Shaanxi 710075, China

摘要

摘要: 单甲基烷烃是湖相烃源岩饱和烃中常见的支链烷烃，其母质来源的研究一直存在争议。对鄂尔多斯盆地上三叠统延长组烃源岩样品进行了TOC测定、岩石热解、饱和烃GC-MS和单体碳同位素等分析，并在饱和烃中检出了丰富的单甲基烷烃化合物。地化分析表明，该区长7-长10烃源岩的有机质类型为Ⅱ-Ⅲ型，C₂₉≥C₂₇规则甾烷，高等植物的贡献略微大于低等水生藻类或细菌；单甲基烷烃碳数分布为C₁₂-C₃₂，甲基取代位置以C₂和C₃为主。饱和烃单体碳同位素组成数据显示，姥鲛烷和植烷的δ₁₃C比同碳数正构烷烃重1‰~2‰；同碳数2-和3-甲基烷烃具有相近的碳同位素组成，表明两类化合物具有相同物源；单甲基烷烃比正构烷烃更富集₁₃C，表现出更大的δ₁₃C值。结合古环境等信息表明，鄂尔多斯盆地检出的单甲基烷烃可能来自于浮游植物或者异养细菌，单甲基烷烃可以作为一种指示生油母质的生物标志化合物。
- 偶数离子碎片峰 /
- 单甲基烷烃 /
- 单体碳同位素 /
- 生物标志化合物 /
- 延长组 /
- 鄂尔多斯盆地
Abstract: Monomethylalkanes are common branched alkanes in the saturated hydrocarbon fraction of lacustrine source rocks. However, there is no agreement about their original source. The abundance of monomethylalkanes, from the Triassic Yanchang Formation source rocks in the Ordos Basin is relatively high. Determination of TOC, Rock-Eval, compound specific carbon isotopic composition, and GC-MS analysis of saturated hydrocarbons show that the organic matter of source rocks from Chang7-Chang10 have a mixed source, and that the type of organic matter is Ⅱ-Ⅲ. The steroid hydrocarbon distributions of source rocks showed nearly equal abundances of C₂₇ and C₂₉ steranes, suggesting mixed organic matter. The monomethylalkanes have 12 to 32 carbons, having a similar distribution to the n-alkanes, and the 2-MMAs and 3-MMAs are predominant. The δ¹³C values of Pr and Ph are 1‰ to 2‰ heavier than corresponding n-alkanes. 2-MMAs and 3-MMAs with the same carbon number have almost the same δ¹³C value, indicating they have the same source. The δ¹³C values of monomethylalkanes range from -29.3‰ to -32.8‰, which are higher than n-alkanes. Moreover, combining with the sedimentary environment information of the Ordos Basin, it appears that the monomethylalkanes might come from phytoplankton and heterotrophic bacteria, and they can be used as a biomarker to judge the predecessor of sediment and petroleum.
- even ion fragment peak /
- monomethylalkanes (MMAs) /
- stable carbon isotope /
- biomarker /
- Yanchang Formation /
- Ordos Basin

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参考文献(31)

[1]	菲尔普 R P.化石燃料生物标志物:应用与谱图[M].傅家谟,盛国英,译.北京:科学出版社,1987:44-48. Philp R P.Fossil fuel biomarkers:Applications and spectra[M].Fu Jiamo,Sheng Guoying,trans.Beijing:Science Press,1987:44-48.
[2]	Fowler M G,Douglas A G.Saturated hydrocarbon biomarkers in oils of Late PreCambrian age from Eastern Siberia[J].Organic Geochemistry,1987,11(3):201-213.
[3]	Kenig F,Damsté J S S,Kock-van Dalen A C,et al.Occurrence and origin of mono-,di-,and trimethylalkanes in modern and Holocene cyanobacterial mats from Abu Dhabi,United Arab Emirates[J].Geochimica et Cosmochimica Acta,1995,59(14):2999-3015.
[4]	Lu Hong,Peng Ping'an,Sun Yongge.Molecular and stable carbon isotopic composition of monomethylalkanes from one oil sand sample:Source implications[J].Organic Geochemistry,2003,34(6):745-754.
[5]	Kenig F.C₁₆-C₂₉ homologous series of monomethylalkanes in the pyrolysis products of a Holocene microbial mat[J].Organic geochemistry,2000,31(2/3):237-241.
[6]	Thiel V,Jenisch A,W rheide G,et al.Mid-chain branched alkanoic acids from "living fossil" demosponges:A link to ancient sedimen-tary lipids?[J].Organic Geochemistry,1999,30(1):1-14.
[7]	Kenig F,Damsté J S S,de Leeuw J W,et al.Molecular palaeontological evidence for food-web relationships?[J].Naturwissenschaften,1994,81(3):128-130.
[8]	Summons R E,Powell T G,Boreham C J.Petroleum geology and geochemistry of the Middle Proterozoic Mcarthur Basin,Northern Australia:Ⅲ.Composition of extractable hydrocarbons[J].Geochimica et Cosmochimica Acta,1988,52(7):1747-1763.
[9]	Summons R E.Branched alkanes from ancient and modern sediments:Isomer discrimination by GC/MS with multiple reaction monitoring[J].Organic Geochemistry,1987,11(4):281-289.
[10]	Klomp U C.The chemical structure of a pronounced series of iso-alkanes in South Oman crudes[J].Organic Geochemistry,1986,10(4/6):807-814.
[11]	Kissin Y V.Catagenesis and composition of petroleum:Origin of n-alkanes and isoalkanes in petroleum crudes[J].Geochimica et Cosmochimica Acta,1987,51(9):2445-2457.
[12]	Love G D,Stalvies C,Grosjean E,et al.Analysis of molecular biomarkers covalently bound within Neoproterozoic sedimentary kerogen//Kelley P H,Bambach R K.From evolution to Geobio-logy:Research questions driving paleontology at the start of a new century,Paleontological Society Short Course,October 4,2008.Paleontological Society Papers 14.:The Paleontological Society,2008:67-83.
[13]	Logan G A,Hinman M C,Walter M R,et al.Biogeochemistry of the 1 640 Ma McArthur River (HYC) lead-zinc ore and host sediments,Northern Territory,Australia[J].Geochimica et Cosmochimica Acta,2001,65(14):2317-2336.
[14]	Arouri K,Conaghan P J,Walter M R,et al.Reconnaissance sedimentology and hydrocarbon biomarkers of Ediacarian microbial mats and acritarchs,Lower Ungoolya Group,Officer Basin[J].Precambrian Research,2000,100(1/3):235-280.
[15]	Logan G A,Calver C R,Gorjan P,et al.Terminal Proterozoic mid-shelf benthic microbial mats in the Centralian Superbasin and their environmental significance[J].Geochimica et Cosmochimica Acta,1999,63(9):1345-1358.
[16]	Han J,Calvin M.Branched alkanes from blue-green algae[J].Journal of the Chemical Society D:Chemical Communications,1970(22):1490-1491.
[17]	Jackson M J,Powell T G,Summons R E,et al.Hydrocarbon shows and petroleum source rocks in sediments as old as 1.7×10⁹ years[J].Nature,1986,322(6081):727-729.
[18]	Audino M,Grice K,Alexander R,et al.Unusual distribution of monomethylalkanes in Botryococcus braunii-rich samples:Origin and significance[J].Geochimica et Cosmochimica Acta,2001,65(12):1995-2006.
[19]	Shiea J,Brassell S C,Ward D M.Mid-chain branched mono- and dimethyl alkanes in hot spring cyanobacterial mats:A direct biogenic source for branched alkanes in ancient sediments?[J].Organic Geochemistry,1990,15(3):223-231.
[20]	Kenig F,Huc A Y,Purser B H,et al.Sedimentation,distribution and diagenesis of organic matter in a recent carbonate environment,Abu Dhabi,U.A.E.[J].Organic Geochemistry,1990,16(4/6):735-747.
[21]	卢鸿,孙永革,彭平安.单甲基支链烷烃的单体碳同位素研究[J].沉积学报,2003,21(2):360-365. Lu Hong,Sun Yongge,Peng Ping'an.Molecular stable carbon isotopic compositions of mono-methyl branched alkanes[J].Acta Sedimentologica Sinica,2006,21(2):360-365.
[22]	卢鸿,孙永革,彭平安.塔里木轮南14井三叠系油砂中长链单甲基支链烷烃及其单体碳同位素组成[J].地质论评,2002,48(S1):218-224. Lu Hong,Sun Yongge,Peng Ping'an.Molecular and stable carbon isotopic compositions of long-chain monomethylalkanes from an oil sand sample in the Lunnan Oilfield,Tarim Basin,NW China[J].Geological Review,2002,48(S1):218-224.
[23]	钱宇,王作栋,贾冬,等.烃源岩中单甲基烷烃化合物分析与鉴定[J].沉积学报,2015,33(5):1033-1042. Qian Yu,Wang Zuodong,Jia Dong,et al.Analysis and identification of monomethylalkanes in source rocks[J].Acta Sedimentologica Sinica,2015,33(5):1033-1042.
[24]	McCarthy E D,Han J,Calvin M.Hydrogen atom transfer in mass spectrometric fragmentation patterns of saturated aliphatic hydrocarbons[J].Analytical Chemistry,1968,40(10):1475-1480.
[25]	Grice K,Audino M,Boreham C J,et al.Distributions and stable carbon isotopic compositions of biomarkers in torbanites from different palaeogeographical locations[J].Organic Geochemistry,2001,32(10):1195-1210.
[26]	吉利明,李剑峰,宋之光.鄂尔多斯盆地延长组葡萄藻的石油地质意义[J].石油勘探与开发,2009,36(2):156-165. Ji Liming,Li Jianfeng,Song Zhiguang.Petroleum geological significance of Botryococcus in Triassic Yanchang Formation,Ordos Basin[J].Petroleum Exploration and Development,2009,36(2):156-165.
[27]	Shiea J,Brassel S C,Ward D M.Comparative analysis of extrac-table lipids in hot spring microbial mats and their component photosynthetic bacteria[J].Organic Geochemistry,1991,17(3):309-319.
[28]	Robinson N,Eglinton G.Lipid chemistry of Icelandic hot spring microbial mats[J].Organic Geochemistry,1990,15(3):291-298.
[29]	Van Kaam-Peters H M E,Damsté J S S.Characterisation of an extremely organic sulphur-rich,150 Ma old carbonaceous rock:Palaeoenvironmental implications[J].Organic Geochemistry,1997,27(7/8):371-397.
[30]	张文正,关德师.液态烃分子系列碳同位素地球化学[M].北京:石油工业出版社,1997:20-35. Zhang Wenzheng,Guan Deshi.Carbon isotope geochemistry of liquid hydrocarbon molecular series[M].Beijing:Petroleum Industry Press,1997:20-35.
[31]	Collister J W,Lichtfouse E,Hieshima G,et al.Partial resolution of sources of n-alkanes in the saline portion of the Parachute Creek Member,Green River Formation (Piceance Creek Basin,Colorado)[J].Organic Geochemistry,1994,21(6/7):645-659.