松辽盆地青山口组页岩孔隙结构及其对页岩油富集的影响
Influence of pore structure on the shale oil accumulation of the Qingshankou Formation in the Songliao Basin
查看参考文献41篇
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文摘
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页岩油主要富集于页岩的基质孔隙内,因而页岩孔隙结构是页岩油富集机理研究的重要内容。本文对松辽盆地青山口组页岩岩心样品进行了有机地球化学、低温N_2等温吸附和高压压汞等分析,以期研究青山口组页岩的孔隙结构及其对页岩油富集的影响。结果表明,页岩样品的汞孔隙度在3%~8%之间,平均孔喉直径在6.7~13.5 nm之间; N_2吸附BJH(Barrett-Joyner-Halenda)孔体积在0.016~0.037 cm~3/g之间, BET(Brunauer-Emmett-Teller)比表面积在2.7~14.4 m~2/g之间。页岩石英含量与大孔孔体积之间有一定的正相关关系,这与石英颗粒有利于粒间孔隙的发育有关。N_2吸附孔体积随着碳酸盐矿物含量的增加而明显降低,表明碳酸盐矿物以胶结物形态对孔隙起破坏作用。游离烃S_1含量与比表面积之间存在明显的负相关关系,这与沥青充填微小孔隙有关。页岩含油饱和度(OSI)与汞孔隙度之间呈现较好的正相关关系,显示压汞所代表的孔隙度对页岩含油量有重要影响。页岩OSI随着大孔孔体积的增加而增加,表明页岩油主要储存在较大的孔隙内。综合分析发现, Yx58井样品由于具有较高的汞孔隙度和大孔孔体积,其含油量较高,表明该井所在地区青山口组底部地层具备一定的页岩油资源潜力。 |
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其他语种文摘
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As shale oil is mainly stored in the matrix pores of shale, the study of shale pore structure is very important to the understanding of shale oil occurrence. In this paper, general organic geochemical, low temperature N_2 isothermal adsorption, and mercury intrusion analyses were performed on shale core samples of the Qingshankou Formation in the Songliao Basin to study their pore structure and influence on shale oil enrichment. The pore measurement results show that the Hg porosity of these shales range from 3% to 8%, with an average pore throat diameter between 6.7 nm and 13.5 nm; the pore volume of N_2 adsorption calculated by the BJH (Barrett-Joyner-Halenda) model is between 0.016 cm~3/g and 0.037 cm~3/g, with a BET (Brunauer-Emmett-Teller) specific surface area between 2.7 m~2/g and 14.4 m~2/g. There is a positive correlation between quartz content and macropore volume, which may be associated with intergranular pores between the quartz grains. The pore volume shows a good negative correlation with carbonate mineral content, indicating that carbonate minerals can destroy the primary pores through cement formation. There is an obvious negative correlation between free hydrocarbon content and specific surface area, due to the bitumen infilling of small pores. The oil saturation index (OSI) shows a good positive correlation with Hg porosity for these shales, indicating that Hg porosity is an important factor controlling oil content in shales. OSI increases with the increase of macropore volume, suggesting that the free oil is mainly stored in larger pores. Finally, we concluded that the shales near the base of the Qingshankou Formation in the area of Yx58 well, which shows high Hg porosity and macropore volume, contain high oil content and are the primary targets for shale oil exploration in the Songliao Basin. |
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来源
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地球化学
,2019,48(6):632-643 【核心库】
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DOI
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10.19700/j.0379-1726.2019.06.011
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关键词
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孔隙结构
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N_2吸附
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高压压汞
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含油量
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青山口组页岩
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松辽盆地
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地址
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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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国家自然科学基金创新研究群体项目
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文献收藏号
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CSCD:6668745
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