Gravity and Magnetic Anomaly Separation Based on Bidimensional Empirical Mode Decomposition
Gravity and Magnetic Anomaly Separation Based on Bidimensional Empirical Mode Decomposition
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发表时间：
2011
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通讯作者：
Chang Tao
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作者：
Chang Tao
地质作用往往经历多个因果或复杂的成因阶段，往往产生由多种地质要素组成的原始重磁异常，包括背景异常，以及可能由沉积、蚀变、隐伏岩等引起的局部异常，重磁异常是矿产勘查和资源潜力评价中的一个难点，如何将重磁异常从原始的复合异常中分离出来，对矿产勘查具有重要意义。经验模态分解（EMD）被认为是一种有效的叠加信息分离方法。本文在总结前人研究成果的基础上，提出了一种基于EMD的重磁异常分离方法，该方法可以有效地分离重磁异常，并能有效地分离重磁异常。提出了一种新的二维经验模态分解（BEMD）方法，即用双调和样条插值（BSI）代替一般的样条插值，以提高BEMD方法的稳定性，并以云南个旧重磁资料为例，应用BEMD方法对地震资料进行多尺度非线性分解，提取出能揭示矿产勘查潜在信息的局部异常，拓展了经验模态分解的应用范围。
Geological process often experienced a number of causal or complex genetic stages,which often resulted in original gravity and magnetic anomaly composed of various geological elements including background anomaly,and local anomaly which may be caused by deposits,alternation and concealed rocks,etc.,which are associated with mineral exploration and prospecting.It is one of the most difficult issues in mineral prospecting and potential resource assessment as how to separate gravity and magnetic anomaly,which is significant for mineral exploration from original composite anomaly.Empirical mode decomposition (EMD) is considered to be an effective method in superimposed information separation.In this paper,a new bidimensional empirical mode decomposition (BEMD) method is proposed,that is,biharmonic spline interpolation (BSI) instead of general spline interpolation for improving stability.As a case study,gravity and magnetic data in Gejiu,Yunnan,China,have been used to extract local anomaly which could reveal potential information in mineral exploration by multiscale and nonlinear decomposition with BEMD method.It extends the application of empirical mode decomposition.