吉木萨尔凹陷二叠系芦草沟组页岩油储层特征及含油性

doi:10.11743/ogg20190309

摘要/Abstract

摘要： 在岩心观察和薄片鉴定的基础上，结合扫描电镜、物性与地球化学分析等资料，对吉木萨尔凹陷芦草沟组储层特征、控制因素及储层含油性进行了研究。分析认为芦草沟组形成于咸化湖盆的沉积环境，发育一套湖相暗色泥、粉细砂及碳酸盐的细粒混杂沉积，岩性主要为由粉细砂、泥及碳酸盐组成的混积岩，且粉细砂、泥及碳酸盐具呈薄层状富集的特征。储集空间类型以粒间溶孔与晶间微孔为主、剩余粒间孔次之、裂缝少量，影响芦草沟组页岩油储层发育的控制因素包括沉积相、岩性、有机碳含量和成岩作用等。吉木萨尔凹陷芦草沟组储层物性对含油性有明显的控制作用，白云质岩中油膜发育；储层的润湿性以中性为主，部分达到亲油，场发射扫描电镜发现了“大孔亲油、含油，小孔亲水、含水”的储层微观润湿性特征，表明吉木萨尔凹陷芦草沟组页岩油储层具有良好的含油性，这为本地区页岩油的勘探与开发奠定了良好的基础。

关键词: 含油性, 润湿性, 储集空间, 储层, 页岩油, 咸化湖盆, 芦草沟组, 吉木萨尔凹陷, 准噶尔盆地

Abstract: The characteristics,controlling factors and oil-bearing capability of the Lucaogou reservoir in Jimusaer sag were studied based on core observation,thin section features,as well as data from scanning electron microscopy (SEM),physical and geochemical analysis.The results indicate that the sedimentary environment of the Lucaogou Formation is of saline lacustrine,in which a set of fine-grained hybrid sedimentation of lacustrine dark mudstone,silty-fine sand and carbonate was developed.Its lithology is mainly diamictite characterized by alternating thin beds of silty-fine sand,clay and carbonate.Reservoir space is dominated by intergranular dissolved pores and intercrystalline micro-pores,with residual intergranular pores ranked second and followed by a few cracks.The controlling factors for the reservoir properties of Lucaogou shale include sedimentary facies,lithology,organic carbon content (TOC) and diagenesis.The reservoir properties of the Lucaogou shale in the study area show a remarkable control on oil-bearing capability,and the oil film was well developed in dolomitic rocks.Reservoir wettability is primarily neutral,followed by localized lipophobicity.In addition,the reservoir micro-wettability change from oil-wet and oil-bearing to hydrophilic and moisture-containing with smaller pore sizes,as showcased by the field emission scanning electron microscopy.It demonstrates that the shale oil reservoir in the Lucaogou Formation,Jimusaer sag,is capable of high saturation oil-bearing,which has laid a sound foundation for the shale oil exploration and development in the region.

Key words: oil-bearing property, wettability, reservoir space, reservoir, shale oil, saline lacustrine basin, Lucaogou Formation, Jimusaer sag, Junggar Basin

中图分类号:

TE122.2

许琳,常秋生,杨成克,等. 吉木萨尔凹陷二叠系芦草沟组页岩油储层特征及含油性[J]. 石油与天然气地质, 2019, 40(3): 535-549. doi: 10.11743/ogg20190309 Xu Lin,Chang Qiusheng,Yang Chengke,et al. Characteristics and oil-bearing capability of shale oil reservoir in the Permian Lucaogou Formation,Jimusaer sag[J]. Oil & Gas Geology, 2019, 40(3): 535-549. doi: 10.11743/ogg20190309

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