| 珠江口盆地番禺低隆起-白云凹陷北坡干酪根热演化模拟与生烃 |
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| 引用本文： | 傅飘儿,李晓亚,汤庆艳,张铭杰,丛亚楠,张同伟.珠江口盆地番禺低隆起-白云凹陷北坡干酪根热演化模拟与生烃[J].沉积学报,2013,31(1):176-183. |
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| 作者姓名： | 傅飘儿 李晓亚 汤庆艳 张铭杰 丛亚楠 张同伟 |
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| 作者单位： | 兰州大学西部环境与气候变化教育部重点实验室 地质科学与矿产资源学院 兰州730000 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(编号:2012CB214701);教育部科学技术研究重大项目(编号:311010);国家自然科学基金项目(批准号:41072056,91014003,40873005、20100559和40772058);国家科技重大专项(编号:2008ZX05025-006);中国科学院广州地球化学研究所有机地球化学国家重点实验室开放基金(OGL-200919)资助 |
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| 摘 要： | 通过密封金管-高压釜体系对珠江口盆地番禺低隆起-白云凹陷北坡恩平组炭质泥岩的干酪根(PY)，在24.1 MPa压力、20℃/hr(373.5~526℃)和2℃/h(343~489.2℃)两个升温速率条件下进行热模拟生烃实验，分析气态烃(C1 5)和液态烃(C6 14和C14+)的产率，以及沥青质和残余有机质碳同位素组成。同时与Green River页岩(GR)和Woodford泥岩(WF)的干酪根，分别代表典型的I型和II型干酪根进行对比研究。结果显示PY热演化产物中总油气量明显低于GR和WF干酪根，且气态烃(C1 5)最高产率是液态烃的1.5倍，揭示恩平组炭质泥岩主要以形成气态烃为主。在热演化过程中，有机质成熟度和母质类型是控制油气比的主要因素，气态烃和轻烃的产率比值主要受热演化成熟度的影响。干酪根残余有机质碳同位素和沥青质碳同位素在热演化过程中受有机质成熟度的影响较小，δ13C残余和δ13C沥青质可以间接反映原始母质的特征，为高演化烃源岩油气生成提供依据。
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| 关 键 词： | 珠江口盆地 干酪根 热模拟 热演化成熟度 碳同位素组成 |
Hydrocarbon Geochemistry from Kerogen Pyrolysis in Panyu Low Massif and North Slope of Baiyun Sag in Pearl River Mouth Basin |
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| FU Piao-er,LI Xiao-ya,TANG Qing-yan,ZHANG Ming-jie,CONG Ya-nan,ZHANG Tong-wei.Hydrocarbon Geochemistry from Kerogen Pyrolysis in Panyu Low Massif and North Slope of Baiyun Sag in Pearl River Mouth Basin[J].Acta Sedimentologica Sinica,2013,31(1):176-183. |
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| Authors: | FU Piao-er LI Xiao-ya TANG Qing-yan ZHANG Ming-jie CONG Ya-nan ZHANG Tong-wei |
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| Institution: | (Key Laboratory of Western China’s Environmental Systems(MOE),School of Earth Sciences,Lanzhou University,Lanzhou 730000) |
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| Abstract: | A series of kerogen pyrolysis in gold tube reactors were conducted at two heating rates of 20 ℃/h (from 373.5 to 526 ℃) and 2 ℃/h (from 343 to 489.2 ℃) under a constant pressure of 24.1 MPa. The kerogen (PY) concentrated from Enping Formations immature carboniferous mudstone in the Panyu Low Massif and North Slope of Baiyun Sag in Pearl River Mouth Basin, China was used in this study. For comparison purpose, the isolated kerogens from Green River shale (GR) and Woodford mudstone(WF) representing typical type I and II kerogens were employed as well. The yields of C1 5, C6 14 and C14+ were quantified, and the carbon isotopic compositions of residual kerogens and asphalts were measured. The results show the total yield of hydrocarbons are low from PY kerogen pyrolysis, and the yield of gaseous hydrocarbons is 1.5 times to liquid hydrocarbons. In contrast, the total yields of hydrocarbons from GR and WF kerogen pyrolysis are apparently great, and are dominated by liquid hydrocarbons. This indicates PY kerogen thermal decomposition mainly forms natural gas. During kerogen thermal decomposition, the oil to gas ratio is controlled by both of organic matter thermal maturity and kerogentypes, yet the ratio of gas and light hydrocarbons is mainly affected by thermal maturation. The carbon isotopic compositions of residual kerogens and alsphalt fraction are almost identical, and less than 0.3‰ 13C enrichment to original value of kerogen is observed from 0.7% to 2.7% Ro during thermal maturation. This suggests that δ13C of residual kerogens or alsphaltane could be used as a indicator to the reconstruction of organic matter type for high mature source rock. |
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