中国不同沉积类型页岩生烃有机孔发育差异
Developmental differences of secondary organic pores among marine, lacustrine, and transitional shale in China
查看参考文献42篇
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文摘
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生烃有机孔的发育本质上受有机质化学结构以及生排烃规律的控制。腐泥型干酪根在“生油窗”内因对液态烃的滞留溶胀作用导致有机孔可见率低;腐殖型干酪根受制于自身弱的生烃潜力,无论成熟度高低有机孔发育均很差。另外,腐泥型干酪根在生油窗阶段释放到页岩基质中的沥青(原油)在高-过熟阶段因热裂解脱挥发分形成大量气孔,并成为有机孔发育的主导载体。但进入变质阶段后,有机质在碳化作用下有机孔发育变差,出现线性、针孔状有机孔。据此,原始干酪根类型为腐泥型的北方中、新生界陆相生油窗页岩因干酪根滞留烃效应导致有机孔可见率低;原始干酪根类型为腐泥型的南方下古生界海相过成熟页岩因基质滞留烃热裂解可见大量脱挥发分孔;而原始干酪根类型为腐殖型的二叠系过渡相页岩受Ⅲ型干酪根化学惰性结构的影响,无论成熟度高低有机孔均很少见。 |
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其他语种文摘
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The development of secondary organic pores (SOP) in shale is determined by the chemical structural alterability and hydrocarbon generation-expulsion regularity of organic matter. TypeⅠ/Ⅱkerogens retain the bitumen and crude oil at the oil-window stage, resulting in the low visibility of SOP. Type Ⅲ kerogens are chemically inert resulting in the undevelopment of SOP regardless of maturity. In addition, the matrix bitumen (crude oil) released from oil-prone kerogens at the oil window stage would generate a large number of SOP resulting from the devolatilization of gaseous hydrocarbons during thermal cracking. It is important to note that the organic matters would be carbonized to produce linear, pinhole-like SOP after entering the metamorphic stage. Therefore, the Mesozoic-Cenozoic lacustrine shale in North China has a low visibility of SOP because of kerogen retention towards the bitumen and oil at the oil-window stage, and the Lower Palaeozoic marine shale in South China significantly developed the SOP because they are rich in the porous pyrobitumen as a product of thermal cracking. The Permian transitional shale in both North and South China can only develop the SOP in a small quantity regardless of maturity because they are rich in the chemically inert type Ⅲ kerogens. |
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来源
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地球化学
,2019,48(6):544-554 【核心库】
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DOI
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10.19700/j.0379-1726.2019.06.003
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关键词
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生烃有机孔
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海相页岩
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陆相页岩
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过渡相页岩
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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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中国地质大学(北京)能源学院, 北京, 100083
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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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中国博士后科学基金
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广东省自然科学基金
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文献收藏号
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CSCD:6668737
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