排-留烃过程对富有机质页岩纳米孔隙发育影响的热模拟实验研究
Influence of hydrocarbon expulsion and retention on the evolution of nanometerscale pores in organic matter rich shale: An example from pyrolysis experiment
查看参考文献42篇
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文摘
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为研究生-排烃过程对页岩纳米孔隙演化的影响,选择低成熟且生烃潜力差异显著的茂名油页岩和大隆组硅质页岩为研究对象,经低温热模拟和索氏抽提增加了页岩在生油高峰期的排烃效率后,通过高温热模拟实验,使具有不同残留烃含量的样品演化到过成熟阶段。通过热模拟产物的地球化学分析和孔隙测量,获得了不同残留烃含量的页岩有机质与孔隙发育的热演化规律。结果表明,在高成熟阶段,富I型有机质的黏土质茂名油页岩的残留烃大量转化为固体沥青,促进了中孔、大孔的发育,对微孔的发育影响较小;具Ⅱ型有机质的大隆组硅质页岩,高成熟阶段残留于页岩中的极性有机组分与干酪根生成新的固体有机质,其纳米孔隙发育较差,导致残留烃对中孔和大孔的发育影响不明显。 |
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其他语种文摘
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To study the influence of hydrocarbon expulsion and retention on the evolution of nanometer-scale pores in shales, two immature shales (Maoming oil shale and Dalong siliceous shale) with different kerogen types were heated at low temperatures to the oil-window, and hydrocarbon expulsion efficiency was enhanced by Soxhlet extraction. Then, samples with different contents of residual hydrocarbon were isothermally pyrolyzed to over mature stages. After investigating geochemical characteristics and porosities of the heated samples, distinct pore structure developments were found in samples with different contents of residual hydrocarbon. Our results suggest that for the shale with type Ⅰ kerogen and abundant clay minerals at high maturities, residual hydrocarbons are converted to solid bitumen and this facilitates the development of mesopores and marcopores; however, micropore evolution is only slightly influenced. For the shale with type Ⅱ kerogen and siliceous minerals, residual hydrocarbons and kerogen coevolve to a new kind of organic solids which generates a small number of pores and their influence on pore evolution is slight. |
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来源
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地球化学
,2018,47(5):575-585 【核心库】
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DOI
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10.19700/j.0379-1726.2018.05.00
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关键词
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排-留烃
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页岩
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纳米孔隙
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热模拟
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地址
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1.
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, 广东, 广州, 510640
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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中国科学院战略性先导科技专项
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中国科学院广州地球化学研究所“一三五”项目
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文献收藏号
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CSCD:6333167
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