PSJ系列数字测井仪在工程勘察中的应用

Application of PSJ Series Digital Logger in Engineering Investigation

在水利工程勘察中,利用PSJ系列数字测井仪测量自然伽马、长短源距人工伽马、视电阻率、井径、纵波速度等参数,并根据其相关曲线特征判定工程钻探中难以发现的软弱薄夹层、裂隙等地质隐患。其中裂隙在视电祖率和声波速度测井曲线上表现为低尖峰异常;而岩层破碎的表现则为小波速值、小密度值、小电阻率及大孔径值;另外在视电阻率和密度值均小的风氧化带区,根据纵波速度还可区分强、弱风氧化带。

In hydraulic engineering investigation, the PSJ series digital logger is used to measure parameters of gamma-ray, long and short spaced artificial gamma, apparent resistivity, caliper and compressional velocity and to determine weak thin partings, fissures geological hidden troubles based on its dependent curve features which are difficult to find in exploration engineering drilling. In which, fissures appear as low tapering anomaly on apparent resistivity and sonic velocity logging traces; while fractured rocks appear as small wave velocity, density, resistivity values arid large caliper log value; besides based on small values of resistivity and density in zones of weathering and oxidation can distinguish whether strong or weak by virtue of compressional velocity.