利用位场及其高阶导数的功率谱计算岩层的深度与厚度

本文导出了利用重力与磁异常及其高阶导数的功率谱计算密度体和磁性体上顶与下底埋深的近似公式,还提供了利用垂向或水平导数谱计算深度的方法。理论模型的试验结果表明,由近似公式计算的精度可以满足实际需要。本文最后根据一条重力剖面资料,计算了密度层上、下界面。

ESTIMATING DEPTHS AND THICKNESS OF ROCK STRATUM BY USING THE POWER SPECTRA OF POTENTIAL FIELDS AND THEIR DERIVATIVES OF DIFFERENT ORDER

In this paper, a series of approximate formulae are derived for estimating the depths to top and bottom of density and magnetic bodies, using the power spectra of gravity and magnetic anomaly fields and their derivatives of different orders. The tests on theoretical models show that the computed depths can meet the accuracy requirement in practical use. Finally, as an example, applying an observed gravity profile, the computed relief of density stratum is given.The method for computing the depths by use of the spectra of vertical or horizontal derivative give support to developing survey with gradiometers.