Potential Field Separation Based on the Empirical Mode Decomposition and its Application

The empirical mode decomposition (EMD) proposed by Norden E Huang is a kind of spatial and temporal filtering process in terms of the signal extremum characteristic scales. The decomposed component contains different bands of frequencies from high to low, and the residual value is the signal trend component representing the signal averaged trend, that is similar to the region anomalies in the geophysical field. Based on this theory, using the EMD to separate the geophysical potential field was proposed in this article. Compared to the conventional methods of moving average and trend analysis, the EMD method is with less artifical influence, and we needn´t set any parameters beforehand. Otherwise, it reflects the potential field intrinsic physical characteristics better. With the EMD, we got satisfactory results in magnetic data processing for igneous rocks exploration related to oil and gas reservoirs of Carboniferous system in certain area of Junggar Basin.