| 东营凹陷沙三下—沙四上亚段页岩油储集空间特征及微观富集模式 |
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| 引用本文：刘姝宁,乔俊程,曾溅辉,李传明,李军亮,刘亚洲,王勇,秦峰,刘新龙,刘宇轩,魏来.2026.东营凹陷沙三下—沙四上亚段页岩油储集空间特征及微观富集模式[J].地球学报,47(2):321-334. |
| DOI：10.3975/cagsb.2025.101401 |
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| 基金项目:本文由国家自然科学基金项目(编号: 41972147)、国家自然科学基金青年项目(编号: 42302144)、中国石油大学(北京)科研基金资助 (编号: 2462024XKBH005)和国家资助博士后研究人员计划(编号: GZC20242002)联合资助。 |
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| 中文摘要:为明确陆相页岩复杂岩相下页岩油富集特征, 通过光薄片鉴定、扫描电镜、氮气吸附与高压压汞联测、有机地球化学及激光共聚焦等实验技术, 分析了东营凹陷古近系沙三下—沙四上亚段页岩的岩石学及岩相特征、孔隙类型及结构特征、含油性及烃类赋存特征。结果表明: ①东营凹陷沙三下—沙四上亚段主要发育纹层状富长英混合页岩、纹层状富碳酸盐混合页岩、纹层状富碳酸盐页岩及层状富碳酸盐页岩4种岩相, 不同岩相孔隙类型及结构存在较大差异, 纹层状富长英混合页岩及层状富碳酸盐混合页岩孔径整体小于 100 nm, 纹层状富碳酸盐混合页岩孔径偏小但连通性较好, 纹层状富碳酸页岩孔径整体小于20 nm, 裂缝发育。②轻重组分顺层分布, 轻质组分主要赋存在长英质纹层及碳酸盐纹层内的粒间孔、晶间孔, 层理缝及构造裂缝中, 重质组分赋存在有机显微组分及黏土纹层中。③纹层状富碳酸盐混合页岩及纹层状富碳酸盐页岩为“原位滞留”型页岩油富集模式; 纹层状富长英混合页岩和层状富碳酸盐混合页岩生烃能力与含油性不匹配, 存在明显的烃类短距离运移现象, 为“微运移调整富集”型页岩油富集模式, 是页岩油勘探的有利“甜点段”。 |
| 中文关键词:陆相页岩 页岩油 含油性 赋存特征 富集模式 东营凹陷 |
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| Reservoir Space Characteristics and Micro-enrichment Patterns of Shale Oil of the Lower Es3 Member–Upper Es4 Member in Dongying Sag |
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| Abstract:To investigate the characteristics of shale oil in the complex lithofacies of lacustrine shale, various experimental techniques such as petrographic thin-section identification, scanning electron microscopy, nitrogen adsorption-desorption isotherm measurements, high-pressure mercury intrusion combined analysis, organic geochemical analyses, and laser confocal microscopy were utilized to analyze the petrological and lithofacies characteristics, pore types and structural characteristics, oil bearing properties, and hydrocarbon occurrence characteristics of shale in lower Es3 member–upper Es4 member in Dongying Sag, namely, laminated feldspathic mixed shale, laminated carbonaceous shale, layered calcareous mixed shale, and laminated calcareous mixed shale, which were characterized by significant differences in the types and structures of pores. The pore diameters of laminated carbonate-rich shale are generally less than 20 nm, and fractures are pronounced. Laminated carbonaceous shales are characterized by pores with diameters that are generally <20 nm, although these shales have extremely well-developed fractures. We also found that light and heavy hydrocarbons are distributed along the laminae, with the former being primarily enriched in the intergranular and intercrystalline pores within the feldspathic and calcareous laminations, as well as in bedding and structural fractures. Heavy hydrocarbons are found predominantly within organic maceral and clay laminae. We further established that the laminated calcareous mixed shale and laminated carbonaceous shale are “in-situ retention” type shale oil enrichment models, whereas laminated feldspathic mixed shale and layered calcareous mixed shale are characterized by an imbalance between hydrocarbon generation capacity and oil content, thereby indicating obvious short distance hydrocarbon migration, which can be considered a “micro-migration adjustment” type shale oil enrichment model, and a favorable “sweet spot” for shale oil exploration. |
| keywords:lacustrine shale shale oil oil content occurrence characteristics enrichment pattern Dongying Sag |
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