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在钻探复盖层很厚的岩矿层时,通常要钻三个以上的钻孔,才能查明复盖层以下岩矿层层面和断裂面的产状。钻进一个钻孔时,为了能及时了解复盖层以下岩矿层层面和断裂面的产状,国外很早就开始试验和发展了定向取心技术。即采用专用工具和仪器,在岩心的端面或侧面留下标记,并对标记进行定向,然后对取出的定向岩(矿)心进行解释,得出岩(矿)心所对应的岩矿层
When drilling overburden rock formations that are thick, it is common practice to drill more than three boreholes in order to ascertain the shape of the rock layers and fractures below the caprock. When drilling into a borehole, in order to keep abreast of the occurrence of rock and mineral layers and fracture surfaces below the caprock, directional coring techniques have been experimented and developed very early in the world. That is, using special tools and instruments to leave markings on the end faces or sides of the core and orient the markings, and then interpret the extracted directional rock (ore) core to get the rock and ore layer corresponding to the rock (ore) heart