地质勘查钻孔孔斜校正及计算方法探讨  

Discussion on oblique correction projection and calculation method of geological exploration borehole

作　　者：杨维[1] YANG Wei(Geological Exploration Research Institute,Guizhou Bureau of Coal Geological Exploration,Guiyang 550081,China)

机构地区：[1]贵州省煤田地质局地质勘察研究院,贵州贵阳550081

出　　处：《煤炭工程》2023年第5期52-56,共5页Coal Engineering

摘　　要：地质勘查钻孔孔斜校正需要掌握合理的孔斜校正及计算方法,获得钻孔在勘查线剖面上投影后的偏移距离,以便绘制勘查线剖面图。根据地层走向与勘查线夹角大小,将孔斜校正投影方法分成三种情况讨论,在研究地层、钻孔三维空间和三角函数关系的基础上,对不同的投影方法分别统一了计算公式,不需判断勘查线及孔斜方位,直接利用测斜数据带入公式计算。通过Excel对以往勘查钻孔孔斜数据进行计算验证,显示计算公式正确。当地层产状及勘查线方位一定的情况下,孔段顶角越大,钻孔越深,选择不同的投影方法造成的剖面累计偏移距离差值越大。The borehole inclination correction of geological exploration needs to master the reasonable borehole inclination correction and calculation method,and obtain the offset distance after the borehole is projected on the exploration line section,so as to draw the exploration line section.According to the angle between the stratum strike and the exploration line,this paper divides the hole inclination correction projection method into three cases.Based on the study of the relationship between the stratum and the three-dimensional space and trigonometric function of the borehole,the calculation formulas for different projection methods are unified respectively.Without judging the exploration line and hole inclination orientation,the deviation measurement data is directly used to bring into the formula calculation.Through the calculation and verification of the hole inclination data of previous exploration boreholes through Excel,it shows that the calculation formula is correct.When the occurrence of the local layer and the orientation of the exploration line are certain,the larger the top angle of the hole section,the deeper the borehole,and the greater the difference of the cumulative offset distance of the section caused by different projection methods.

关 键 词：煤田地质勘查 孔斜校正 投影方法 计算公式 剖面图 

分 类 号：P624[天文地球—地质矿产勘探]