基于有机质类型的陆相烃源岩有机孔隙成因研究

项目名称： 基于有机质类型的陆相烃源岩有机孔隙成因研究

项目编号： No.41502144

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 韩辉

作者单位： 西南石油大学

项目金额： 20万元

中文摘要： 烃源岩中的有机孔隙可以作为烃类的排驱通道和滞留空间。因此，有机孔隙的发育程度对排烃效率与页岩油气富集程度有重要影响。目前,有机孔隙的成因尚存在争议，同时缺乏对陆相烃源岩中有机孔隙演化特征的研究。针对陆相烃源岩有机孔隙成因这一科学问题，本项目拟选取富含Ⅰ型、Ⅱ型和Ⅲ型有机质、不同热演化阶段的陆相烃源岩及其干酪根为研究对象，采用场发射扫描电镜和低压气体吸附对它们进行孔隙表征，并对热演化程度较低的样品进行基于环境扫描电镜的热模拟实验，原位观察有机孔隙演化特征。在上述分析测试的基础上，结合油气地质与地球化学基本理论，以期揭示陆相烃源岩中有机孔隙成因，并明确不同类型有机质的孔隙演化特征。研究结果可以为烃类排驱和页岩油气评价方面的工作提供理论依据。

中文关键词： 烃源岩；有机质；类型；孔隙；成因

英文摘要： The organic matter (OM) hosted pores in source rock can serve as path and reservoir in hydrocarbon expulsion and hydrocarbon retention, respectively. Therefore, the abundance of OM pore has an effect on hydrocarbon expulsion efficiency and the enrichment of shale oil and shale gas. At present, the origin of OM pore is controversial, and the evolution of OM pore in continental source rocks has not been well studied. In this study, three serials of source rocks with type I, type II, and type III OMs are selected. Field emission scanning electron microscopy (FE-SEM) and low-pressure gas adsorption will be employed to study their pore characteristics. The in-situ observation will be performed on the samples with low maturity through pyrolysis simulation experiments. Based on the analysis data above and the theories of petroleum geology and geochemistry, the origin and evolution of OM pore in continental source rocks could be revealed. The results can provide some theoretical implications in hydrocarbon expulsion and the evaluation of shale oil and shale gas.

英文关键词： source rock;organic matter;type;pore;origin