钻孔伽玛场理论及形态系数计算的进一步研究

FURTHER STUDIES ON THE THEORY OF GAMMA FIELD IN BOREHOLE AND THE CALCULATION OF SHAPE COEFFICIENT

钻孔伽玛场理论,是总量伽玛测井中分层解释方法的理论基础,在放射性勘探中占有重要地位。目前只有直孔伽玛场理论,故分层解释方法(反褶积法除外)只能解释直孔伽玛测井曲线。作者提出了斜孔一次伽玛场理论,同时对斜孔一次伽玛场性质、D函数性质及D函数与其他伽玛场函数关系做了一些讨论,进而解决了斜孔形态系数计算问题。

The theoretical basis of subdivision interpretation in total gamma logging is the theory of gamma field in borehole, which is very important in uranium exploration. Now there is only the theory of gamma field in vertical borehole. So total gamma-ray logging curve of vertical borehole can be interpreted by subdivision interpretation (except deconvolution). The author presents the theory of primary gamma field in slant borehole. At the same time, the nature of gamma field in slant borehole and D function as well as the relation between D function and other gamma field functions are discussed, and then the problem on the calcula- tion of shape coefficient of slant borehole is solved.