众所周知,在钻孔γ场的理论计算和γ测井的定量解释中,都假设探测器位于钻孔的中心线位置。可是在铀矿床的勘探过程中,大多是倾斜钻孔,故在测井时探管不可能处于钻孔的中心线位置,而是始终紧贴钻孔的底壁,沿着AA′线上下移动(图1)。二者间有偏离,偏 It is well known that both the theoretical calculation of the γ field and the quantitative interpretation of the γ log are based on the assumption that the detector is located at the center of the borehole. However, during the exploration of uranium deposits, most of them are inclined boreholes. Therefore, the probe can not be located at the centerline of the borehole during logging, but always moves up and down along the bottom wall of the borehole along the line AA ’ (figure 1). Deviation between the two, partial