| 煤和煤系泥岩生油能力再评价 |
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| 引用本文： | 帅燕华,张水昌,陈建平.煤和煤系泥岩生油能力再评价[J].地球化学,2009,38(6):583-590. |
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| 作者姓名： | 帅燕华 张水昌 陈建平 |
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| 作者单位： | 中国石油,勘探开发研究院,油气地球化学重点实验室,北京,100083 |
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| 基金项目： | 中国石油勘探开发研究院中青年创新项目(2007-A-1) |
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| 摘 要： | 煤和分散有机质（煤系泥岩或页岩）对煤成油田的贡献大小一直没有获得统一认识，这导致煤是否具有生排油能力直到现在仍然争论不休。选择了两个典型侏罗系煤和一个煤系泥岩样品，分别进行了限定体系热解生烃模拟，结果表明热解特征较差的泥岩（H／C 0．77，IH 146mg／g）却比中等富氢煤（H／C 0．82，IH 260mg／g）的生油量高出2．7倍，是一般煤（H／C 0．75，IH 199mg／g）生油潜力的6倍。这暗示着在煤成油评价中，不能简单把煤和煤系分散有机质对等进行评价，不然会低估煤系相对分散有机质的贡献而过高估计了煤的作用。热解模拟结果与吐哈盆地台北凹陷煤系岩石中有机质含量对比结果表明，该凹陷煤成油更可能来自于煤系泥岩而不是煤本身。此外，通过分析发现煤中液态烃稳定性较差，一般在低熟阶段就开始裂解生气，因此，被国内外学者普遍采纳的，IH（或S1）随成熟度变化的趋势不能作为判断煤排油门限的有效参考。
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| 关 键 词： | 煤 煤系泥岩 煤成油 排烃门限 |
Comparison of the oil potential of coal and coaly mudstone |
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| SHUAI Yan-hua,ZHANG Shui-chang,CHEN Jian-ping.Comparison of the oil potential of coal and coaly mudstone[J].Geochimica,2009,38(6):583-590. |
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| Authors: | SHUAI Yan-hua ZHANG Shui-chang CHEN Jian-ping |
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| Institution: | Research Institute of Petroleum Exploration and Development of CNPC;Beijing 100083;China |
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| Abstract: | For the purpose of comparison of the oil production from coal and coaly mudstone,three coaly samples (two coals and a coaly mudstone)from the Turpan-Hami basin were pyrolyzed in confined gold vessels at a constant heating rate of 20℃/h from 250 ℃ to 600 ℃.The generated liquid and gaseous hydrocarbons were collected and analyzed using a full suite of geochemical methods.It is clearly shown that even a coaly mudstone with poor quanlity (H/C,0.77;I_H,146 mg/g TOC)is much more oil-prone than a good boghead coal sample(H/C,0.82;I_H,260 mg/g TOC),not to mention a common coal(H/C,0.75;I_H,199 mg/g TOC).The maximum yields of C_(6-14) and C_(14~+) from coaly mudstone are 50 mg/g TOC and 30 mg/g TOC,respectively,2.7～6 times higher than those from coals.The results suggest that it is inaccurate to take coaly mudstone as coal during source assessment though they have similar hydrocarbon production parameters expressed as I_H and H/C ratio.The absolute concentrations of chloroform extracts from coals in the Taibei Depression of Turpan-Hami Basin are much higher than the calculted coal-derived C_(15~+) yield determined from the results of laboratory artificial experiments.By contraries,the chloroform extract concentration from coaly mudstone is greatly less than C_(15~+) yield.It suggests that almost all the oil generated by coal should not satisfy its adsorption and do nothing to Jurrassic-reservoired oils proposed previously to have derived from coal measures(e.g.coals).Therefore,the coaly mudstone,not coal,may have contributed to the coal-derived oil in the region. |
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| Keywords: | coal coaly mudstone coal-derived oil hydrocarbon expulsion threshold |
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