重力高阶方向导数的可视化拟合及其应用

针对目前人们所使用的交互式重力剖面拟合软件多以正演布格重力异常为主,在应用效果方面存有欠缺的情况,提出了在作重力剖面布格异常拟合的同时,增加高阶方向导数的拟合。其目的是发挥布格重力异常的高阶方向导数在突出浅部地质体的特征,压制区域性深部地质因素,区分相邻地质体引起的叠加异常等方面的优势。这里采用最小二乘法演算了布格重力异常高阶方向导数的计算过程,对计算程序编制和使用中涉及的相关问题进行了阐述,并例举了在地球物理勘探中,利用高阶方向导数提高重力资料解释效果的实例。并在最后对重力剖面进行可视化拟合解释时应注意的要点做了分析,强调了兼顾布格重力异常及其高阶方向导数二者拟合曲线均基本相似,而不应追求其中某一方面精确拟合的解释原则。

Visualization fitting and application on high-order derivatives in gravity

Armed at the defects in the application of the conventional interacting gravitational profile mainly using forward of Bouguer gravity anomaly,Fitting with high-order derivatives is adopted with the advantages to feature lower geological bodies,suppress regional deeper geological factors and recognize the deference of anomalous caused by borders on geological bodies.An example is given to show the improvement of gravity data interpretation using high-order derivatives in geophysical prospecting.Finally,it is analyzed for fitting explanation on visualization in gravitational profiles,and at the same time it is stressed that it is similarly in fitting curves both Bouguer gravity anomaly and high-order derivative,while it is not pursued the explanative principle in a single fitting precision.