论文部分内容阅读
以屯兰煤矿G3水文孔为取样孔,通过岩石薄片鉴定、X射线荧光光谱分析、岩石微结构分析等综合实验,分析了奥陶系峰峰组岩性、孔隙结构特征。研究表明:峰峰组上段为角砾状石灰岩;下段为泥晶白云岩,裂隙中充填粗粉晶石膏,岩溶不发育。峰峰组上段孔隙直径≥10μm的占27%,峰峰组下段中下部孔隙直径≥10μm的占11%,直径<0.1μm极细小和超毛管微孔隙占59%,说明峰峰组下段渗透性大大降低。峰峰组顶部和下部存在隔水层,可利用的隔水关键层厚度顶部35 m,下部70 m。
Taking the G3 hydrological hole of Tunlan coal mine as a sampling hole, the lithology and pore structure of the Fengtao Formation of Ordovician were analyzed through the comprehensive experiment of rock slice identification, X-ray fluorescence spectroscopy and rock microstructure analysis. The results show that the upper part of Fengfeng Formation is brecciated limestone, the lower part is muddy dolomite, and the crack is filled with coarse gypsum gypsum, and the karst is not developed. The upper peak of the peak group accounted for 27% of the pores with a diameter of ≥10μm, the middle and lower pores of the lower peak of the peak group accounted for 11% of the pores with a diameter of ≥10μm, the diameter of <0.1μm was very small and the microporosity of the capillary was 59% Greatly reduced. There is a water barrier at the top and bottom of the peak-crest group. The available key water-barrier thickness is 35 m at the top and 70 m at the bottom.