有机-无机协同成岩作用及其对页岩油成储的影响——以东营凹陷为例

Shale oil is an important exploration area for hydrocarbon resources, which is an assemblage of source rock and reservoir. The reservoir formation of shale oil is a synthesis process, integrating the hydrocarbon generation and the storage space formation, in which, the organic-inorganic synergistic diagenesis is the key and the current weak study. The Dongying Depression has great shale oil resource potential and abundant geological materials and data. Based on shale cores, using the multi-dimensional observation and quantitative test methods at different scales, firstly carry out sophisticated ways occurrence of organic and inorganic components. Combined with diagenesis simulation and hydrocarbon generation simulation, make clear the organic-inorganic synergistic diagenesis mechanism of shale, analyze the regularity of mineral transformation, storage space formation and organic matter evolution, establish the relationship between organic matter evolution with the mineral conversion, storage space and reservoir properties, study the effectiveness, oil-bearing property and hydrocarbon occurrence of different storage space, and ultimately establish the matching mechanism of organic matter evolution, diagenesis, and reservoir space formation and shale oil occurrence. We expect to obtain innovative achievements on shale oil reservoir formation mechanism, and publish 3 or more SCI papers in key international periodicals.

页岩油是未来油气勘探的重要领域，具有源储一体的特点。页岩油储层的形成是集有机质生烃与储集空间形成演化于一体的综合过程，该过程中有机-无机协同成岩作用是页岩油成储的关键，也是当前研究的薄弱环节。东营凹陷页岩油资源潜力大，基础资料丰富，本项目以页岩岩心为基础，利用多维度不同尺度的观察及定量测试手段，首先开展精细的有机与无机组分的赋存方式、储集空间及烃类赋存等页岩微观组构特征的研究；在此基础上结合成岩模拟和生烃模拟，理清页岩有机-无机协同成岩作用机制，以岩石类型为单元，分析细粒物质矿物转化序列、储集空间的形成及有机质演化等规律，建立有机质演化与矿物转化、储集空间及储集性能的匹配关系；分析成岩过程中不同尺度的储集空间的有效性、含油性及油赋存状态；建立有机质演化、成岩作用、储集空间形成与页岩油赋存的匹配机制。以期取得页岩油成岩成储机理创新性成果，并发表3篇以上国际SCI期刊论文。

页岩油储层的形成是集有机质生烃与储集空间形成演化于一体的综合过程，该过程中有机-无机协同成岩作用是页岩油成储的关键，也是当前研究的薄弱环节。建立了基于纹层组合的组分(有机/无机)赋存模式，系统刻画了页岩储集空间类型及特征，提出了并论证了碳酸盐重结晶晶间孔是济阳坳陷页岩油储层核心基质孔隙，并阐明了其有机质热演化诱发的成因机制，建立了不同岩相的储集空间组合及烃类赋存模式。阐明了不同纹层组合(7种主要纹层组合)的成岩进程和驱动机制差异性，揭示了纹层成层性是流体传输和页岩油烃类差异富集的关键因素，纹层界面是成岩流体横向传输的重要通道。提出了重结晶碳酸盐纹层边缘是富钙质页岩烃源岩烃类运移的重要通道，是对以“黏土矿物成岩、分子扩散和微裂缝”为主导机制的传统烃类初次运移模式的重要补充。系统阐述了陆相页岩成岩过程中有机-无机相互作用方式及机制，理清了页岩油储层生烃-成岩-成孔-赋存匹配机制，建立了储集空间发育及烃类赋存随埋藏演化发育模式。受项目资助，在Geochimica et Cosmochimica Acta、GSA Bulletin、AAPG Bulletin等杂志发表论文6篇，入选ESI高被引论文1篇。项目负责人及其指导研究生累计参加国内外学术会议8次，得到了国内外同行的积极评价和认可。