三塘湖盆地芦草沟组岩相特征及其与页岩油藏的关系

doi:10.7657/XJPG20200606

摘要/Abstract

摘要：

三塘湖盆地芦草沟组页岩油是勘探重点领域,但由于对岩相特征及其与页岩油藏的关系研究不足,制约了勘探进展。综合运用岩心观察、薄片鉴定、场发射环境扫描电镜分析、X射线衍射全岩矿物分析、高压压汞、核磁共振等技术手段,对三塘湖盆地芦草沟组开展了岩相类型划分、岩相特征描述及分布特征研究。研究表明：芦草沟组以碳酸盐矿物、火山碎屑及有机质组成的多组分混杂岩相为主,包括块状凝灰岩、厚层状泥晶白云岩、纹层状凝灰质白云岩和纹层状白云质凝灰岩4种岩相类型,多为中等—富有机质级别;不同岩相类型的物性、孔喉结构特征以及储集空间类型存在差异,其中,块状凝灰岩和厚层状泥晶白云岩孔隙发育,含油性好,压裂后获得高产,且能持续稳产;纹层状凝灰质白云岩裂缝发育,压裂后获得高产,但稳产效果差。根据岩相分布预测,条湖凹陷南缘、马朗凹陷牛圈湖构造为页岩油勘探有利区。

关键词: 三塘湖盆地, 二叠系, 芦草沟组, 页岩油, 岩相类型, 细粒混合沉积岩, 沉积环境

Abstract:

The shale oil of Lucaogou formation in Santanghu basin is the key exploration target for Tuha oilfield. The researches on lithofacies characteristics and its relationship between lithofacies characteristcs and shale oil reservoirs are lacking, which directly restricts the progress of exploration. The lithofacies type division, fine lithofacies description and lithofacies distribution in the Lucaogou formation of the Santanghu basin are studied through techniques such as core observation, thin section identification, SEM analysis on field emission environment, whole-rock mineral analysis by X-ray diffraction, high-pressure mercury injection and nuclear magnetic resonance. The results show that the reservoir of Lucaogou formation is mainly composed of carbonate, pyroclast and organic matters, and can be classified into massive tuff, thick stratified dolomicrite, laminated tuffaceous dolomite and laminated dolomitic tuff, most of which are medium-rich in organic matter. There are differences in reservoir physical properties, pore-throat structures and reservoir spaces among different lithofacies types. The massive tuff and thick stratified dolomicrite have well-developed pores and good oil-bearing properties, and high yield and sustainable production can be achieved after fracturing. Fractures are well developed in the stratified tuffaceous dolomite, and high yield can also be obtained after fracturing, but cannot be maintained. It is predicted according to the lithofacies distribution that the southern margin of the Tiaohu sag and the Niujuanhu structure in the Malang sag are favorable areas for shale oil exploration.

Key words: Santanghu basin, Permian, Lucaogou formation, shale oil, lithofacies type, fine-grained mixed sedimentary rock, sedimentary environment

中图分类号:

TE122.2

徐雄飞, 于祥春, 卿忠, 张亦婷, 李天军, 于海跃, 王秉乾. 三塘湖盆地芦草沟组岩相特征及其与页岩油藏的关系[J]. 新疆石油地质, 2020, 41(6): 677-684.

XU Xiongfei, YU Xiangchun, QING Zhong, ZHANG Yiting, LI Tianjun, YU Haiyue, WANG Bingqian. Lithofacies Characteristics and Its Relationship With Shale Oil Reservoirs of Lucaogou Formation in Santanghu Basin[J]. Xinjiang Petroleum Geology, 2020, 41(6): 677-684.

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