摘要
研究了提高频率域中导数计算结果的精度以及局部波数反演结果的稳定性和精度,对比了余弦扩边方法和最小曲率扩边方法在频率域中计算导数的精度。通过对比表明,最小曲率扩边结果的精度高于余弦扩边结果的精度,提出了向上延拓某一高度来进行局部波数的反演技术。此技术不但能够解决高频干扰,提高导数计算精度,而且利用不同延拓高度的反演结果能够得到一个平稳的反演结果,从而提高了局部波数反演的精度。理论模型试算验证了方法技术的精度,实际资料处理验证了方法技术的稳定性,达到了满意的效果。
This paper deals with the improvement of the calculation accuracy of derivation in the frequency domain and studies the stability and accuracy of the local wavenumber inversion result.A comparison of the calculation accuracy between the cosine function extending edge and the minimum curvature extending edge shows that the result of minimum curvature extending edge is higher than that of the cosine function extending edge.This paper proposes a technique which uses upward continuation to a certain height to acquire the local wavenumber inversion,which solves the high-frequency interference,improves the calculation accuracy of the derivation,and also obtains stationary inversion results that use different continuation heights,thus improving the accuracy of local wavenumber stationary.The precision of the technique was tested with numerical models.The authors have attained satisfactory results,as evidenced by the fact that the stabilization of the technique was proved by the real data processing.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第6期779-784,共6页
Geophysical and Geochemical Exploration
关键词
磁异常解释
局部波数
最小曲率
余弦扩边
向上延拓
导数计算
magnetic anomaly interpretation
local wavenumber
minimum curvature
upward continuation
derivative
