苏北盆地高邮凹陷阜宁组二段页岩油赋存状态定量表征及控制因素

Quantitative characterization and control factors of shale oil occurrence state in the shale of member 2 of Funing Formation in the Gaoyou Sag, Subei Basin

摘要

鉴于页岩油赋存状态对页岩油富集和可动性有重要影响，以苏北盆地高邮凹陷阜宁组二段（阜二段）页岩为研究对象，利用多温阶热解和激光共聚焦显微镜等技术，定量表征高邮凹陷阜二段页岩油赋存状态，明确赋存状态的控制因素。结果表明：高邮凹陷阜二段页岩油赋存状态分为游离油和吸附油两大类，以游离油为主，平均占总含油量的 65.16% ；不同岩相页岩油赋存状态差异明显，游离油占比由高到低依次为长英质页岩>长英-灰云质混积页岩>长英-黏土质混积页岩>灰云质页岩；有机质成熟度、总有机碳质量分数（w（TOC））、矿物组分和孔隙结构等因素共同控制高邮凹陷阜二段页岩油赋存状态。游离油和吸附油量主要受 w（TOC）和孔隙结构控制，游离油量与 w（TOC）呈弱正相关关系，吸附油量与 w（TOC）呈强正相关关系。游离油、吸附油量与孔体积呈正相关关系，与比表面积相关性不明显。游离油和吸附油的比例主要受有机质成熟度、长英质矿物含量和孔隙结构影响，吸附油比例随有机质成熟度增高而减小，游离油比例与长英质矿物含量呈弱正相关关系。宏孔及微裂缝越发育，游离油比例越高。该结果对苏北盆地页岩油的规模勘探开发具有指导意义。

Abstract

In view of the fact that the occurrence state of shale oil has an important influence on the enrichment and mobility of shale oil, taking the member 2 of Funing Formation shale in the Gaoyou Sag of the Subei Basin as the research object, a variety of techniques including multi-temperature pyrolysis and laser confocal microscopy were used to quantitatively characterize the occurrence state of shale oil, and to clarify the controlling factors of its occurrence state.The results show that the occurrence state of shale oil in the member 2 of Funing Formation shale in the Gaoyou Sag can be divided into two categories: free oil and adsorbed oil.Free oil is the main type, accounting for an average of 65.16% of the total oil content.There are significant differences in the occurrence state of shale oil among different lithofacies.The proportion of free oil from high to low is siliceous shale, siliceous-calcareous mixed shale, calcareous-clayey mixed shale and calcareous shale.Organic matter maturity, total organic carbon w(TOC), mineral composition, and pore structure are among the various factors that jointly control the - IV -occurrence state of shale oil.The content of free oil and adsorbed oil is mainly controlled by w(TOC) and pore structure.The amount of free oil is weakly positively correlated with w (TOC), while the amount of adsorbed oil is strongly positively correlated with w (TOC).Both the content of free oil and adsorbed oil are positively correlated with pore volume, while their correlation with specific surface area is not significant.The relative proportions of free oil and adsorbed oil are primarily influenced by organic matter maturity, silica mineral content and pore structure.The proportion of adsorbed oil decreases with increasing organic matter maturity, while the proportion of free oil is weakly positively correlated with the content of long-chain alkane minerals.The more developed the macro-pores and micro-cracks, the higher the proportion of free oil.These research findings are of great significance for guiding the exploration of shale oil in the Subei Basin.

关键词

苏北盆地 / 阜宁组二段 / 页岩油 / 赋存状态 / 游离油 / 吸附油 / 控制因素 / 高邮凹陷

Key words

Subei Basin / member 2 of Funing Formation / shale oil / occurrence state / free oil / adsorbed oil / controlling factors / Gaoyou Sag

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基金资助

国家自然科学基金项目(42272137)