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Hydrogen isotopic characteristics and their genetic relationships for individual n-alkanes in plants and sediments from Zoigê marsh sedimentary environment

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Science China Earth sciences 2010年第9期53卷 1329-1334页

作者： duan yi1, zheng chaoyang2 & wu baoxiang1 1 key laboratory of petroleum resources research, institute of geology and geophysics, chinese academy of sciences,{4., China 2 Department of geology, Northwest University, Xi’an 710069, China 1. key laboratory of petroleum resources {4. Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China2. Department of Geology Northwest University Xi’an 710069 China

To understand internal relations of their hydrogen isotopic compositions in typical marsh environment, we, using GC-IRMS analytical technique, measured the hydrogen isotopes of individual n-alkanes in the herbaceous plant, woody plant leaf, and sediments from Zoigê marsh in China. The results show significant differences in the hydrogen isotopic compositions of n-alkanes among the different kinds of plants and the different species in the same kind. δD values of n-alkanes in the herbaceous plants (from -254. to -184.) are lighter than those in woody plant leaf ( from -195‰ to -14.‰ ), and the hydrogen isotopic compositions of n-alkanes in K. tibetica P. are lighter than P. pratensis L. The mean δD values of n-alkanes in the sediments from Zoigê marsh reflect that they were derived from herbaceous plants, which is consistent with the peat samples being composed mainly of herbaceous plant remnants. The significant differences in hydrogen isotopic compositions of n-alkanes among the sedimentary samples are caused possibly by environment factors and the difference in input quantity of different herbaceous plants. A certain negative correlation exists between the δ13C and δD values of n-alkanes in the samples, and plant types can be distinguished using the cross plot of δD vs. δ13C values of n-alkanes in the plants. These data and recognitions provide scientific basis for hydrogen isotopic applied research of individual n-alkanes.

关键词： marsh environment plants sediments individual lipids hydrogen isotopes genetic relationship

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Carbon isotopic characteristics and their genetic relationships for individual lipids in plants and sediments from a marsh sedimentary environment

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Science China Earth sciences 2005年第8期48卷 1203-1210页

作者： duan yi1, ZHANG Hui1, zheng chaoyang1, wu {4. & zheng Guodong2 1. lanzhou institute of geology, chinese academy of sciences, lanzhou 730000, China 2. Department of Earth & Planetary System Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-85Japan 1. lanzhou institute of geology Chinese Academy of Sciences 730000 Lanzhou China 2. Department of Earth & Planetary System Science Graduate School of Science Hiroshima University 739-8526 Higashi-Hiroshima Japan

The carbon isotopes of individual lipids in herbaceous plants and tree leaves in Ruoergai marsh were measured by the GC-IRMS analytical technique in order to understand the inherent relationships of carbon isotopes between sedimentary and plant lipids from typical marsh environment. The analytical results show that the carbon isotopic compositions of n-alkanes in different kinds of plants differ significantly. Mean δ 13C values of n-alkanes in her-baceous plants (?32.2‰―?36.9‰) are 3.3‰ lower than those in woody plant (?27.2‰― ?35.0‰). The carbon isotopic compositions of fatty acids in organisms (?30.3‰― ?36.2‰) are very similar to those of n-alkanes and the δ 13C values for unsaturated fatty acids are within the range of those for saturated fatty acids. The differences in δ 13C values between plant lipids are obvious and range from 2.4. to 7.8‰. It is observed that the carbon isotopic compositions of sedimentary lipids are closely related to those of plant lipids. The carbon isotopic compositions (?27.0‰―?36.9‰) of n-alkanes, ≥C16 fatty acids, n-alkanols, sterols and n-alkanones in the sediments are similar to those of plant lipids and the carbon isotopic compositions of short-chain sedimentary lipids are similar to those of long-chain sedimentary homologues. These indicate that the sedimentary lipids are derived from high plants. However, the δ 13C values of C14.0 and C15:0 fatty acids in the sediments are lighter than those of the same carbon number saturated homologues in plants, reflecting the genetic features partially derived from bacteria. These data provide scientific evidence for carbon isotope-applied research of individual lipids.

关键词： marsh environment, plants, sediments, individual lipids, carbon isotopic compositions, genetic relationships.

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Hydrogen isotopic characteristics and their genetic relationships for individual n-alkanes in plants and sediments from Zoige marsh sedimentary environment

Hydrogen isotopic characteristics and their genetic relation...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： duan yi~(1*),zheng chaoyang~2 & {4. baoxiang~1 1 key {4. of petroleum resources research,institute of geology and geophysics,{14.,lanzhou 730000,China 2 Department of geology,Northwest University,Xi’an 710069,China

To understand internal relations of their hydrogen isotopic compositions in typical marsh environment,we,using GC-IRMS analytical technique,measured the hydrogen isotopes of individual n-alkanes in the herbaceous plant,woody plant leaf,and sediments from Zoige marsh in *** results show significant differences in the hydrogen isotopic compositions of n-alkanes among the different kinds of plants and the different species in the same kind.δD values of n-alkanes in the herbaceous plants(from -254.to -184.) are lighter than those in woody plant leaf(from -195‰to -14.‰),and the hydrogen isotopic compositions of n-alkanes in *** *** lighter than *** *** meanδD values of n-alkanes in the sediments from Zoige marsh reflect that they were derived from herbaceous plants,which is consistent with the peat samples being composed mainly of herbaceous plant *** significant differences in hydrogen isotopic compositions of n-alkanes among the sedimentary samples are caused possibly by environment factors and the difference in input quantity of different herbaceous plants.A certain negative correlation exists between theδC andδD values of n-alkanes in the samples, and plant types can be distinguished using the cross plot ofδD vs.δC values of n-alkanes in the *** data and recognitions provide scientific basis for hydrogen isotopic applied research of individual n-alkanes.

关键词： marsh environment plants sediments individual lipids hydrogen isotopes genetic relationship

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Characterization of gases and solid residues from closed system pyrolysis of peat and coals at two heating rates

Characterization of gases and solid residues from closed sys...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： yi duan~*,baoxiang wu,Jinxian He,Tao Sun {4. laboratory of petroleum {4. research,institute of geology and geophysics,chinese academy of {14.,382 West Donggang Road,lanzhou 730000,China

Closed system gold-tube pyrolysis experiments were performed on a peat and two coals(TY:R = 0.51%;SX:R-0.94.) at temperatures ranging from 337 to 600℃and a pressure of 50 MPa with heating rates of 2 and/or 20℃/*** reaction residues were analyzed *** and chemical and isotopic compositions of the generated gases were also *** three samples had similar thermal evolution *** increasing heating temperature,vitrinite reflectances(VR) of the residues increased linearly from 0.72%to 4.50%.This increase was lesser for the sample with a higher hydrocarbon generation potential and at faster heating *** compositions are dominated by CO and CH throughout the experimental *** gas and CH yields gradually increase with pyrolysis temperature for all *** carbon isotopic compositions of CH generated from the peat are lighter than those from the ***δC(CH) values exhibit a generic evolution pattern which the initial CH is isotopically heavy,then becomes lighter at moderate temperatures,and finally becomes heavier *** produced from the samples at low heating rate has higher transformation ratio than that at high heating rate under the same temperature,so tends to be isotopically heavy after pyrolysis temperature of more than 4.8℃.

关键词： Pyrolysis Coal Peat Gas generation Vitrinite reflectance

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Thermal simulation of the formation and evolution of coalbed gas

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chinese Science Bulletin 2005年第S1期50卷 40-44页

作者： duan yi wu baoxiang {4. chaoyang WANG Chuanyuan key laboratory of Gas Geochemistry Institute of Geology and GeophysicsChinese Academy of SciencesLanzhou 730000China Graduate School of chinese academy of sciences Beijing 100039China

Thermal simulation experiment of gas generation from the peat and the coals were performed using the high temperature and pressure apparatus, at temperature ranging from 336.8-600℃, a pressure of 50MPa and two heating rates of 20℃/h and 2℃/h, and the evolution and formation of coalbed gas components were studied. Results show that for the coals, the gaseous products are mainly composed of hydrocarbon gases. However, for the peat the content of hydrocarbon gases in gaseous products is lower than that of non-hydrocarbon components. In the generated hydrocarbon gases methane is predominant and heavy hydrocarbon gases (C2-5) are present in small amount. Meanwhile, carbon dioxide (CO2) predominates the generated non-hydrocarbon gases, and hydrogen (H2) and sul-furated hydrogen (H2S) are existent in trace amount. It is also observed that temperature is the main factor controlling the evolution of coalbed gas generation. With increasing vitrinite reflectance, methane rapidly increases, CO2 sightly increases, and C2-5 hydrocarbons first increase and then decrease. The peat and Shanxi formation coal have a higher generative potential of coalbed gases than coals and Taiyuan formation coal, respectively, reflecting the effect of the property of organic matter on the characteristics of coalbed gas component generation. In this study, it is found that low heating rate is favorable for the generation of methane, H2 and CO2, and the decomposition of C2-5 hydrocarbons. This shows that heating time plays an important controlling role in the generation and evolution of coalbed gases. The results obtained from the simulation experiment in the study of coalbed gases in natural system are also discussed.

关键词： coalbed gas generation and evolution pyrolysis peat coal heating rate.

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