Archive | 2019
Fourier transform and correlation analysis for CSEM data processing
Abstract
Controlled Source Electromagnetic Method (CSEM) has the advantages of large depth of exploration and high efficiency. It has a wide range of applications in resource exploration and engineering surveys. However, CSEM data is often contaminated by strong cultural noise. In this paper, a novel method for CSEM data processing is proposed by combining the Fourier transform and correlation analysis. First, the observed data is performed by the Fourier transform, and the power-line noises are accurately removed in the frequency-domain. Second, the inverse Fourier transform is performed to the de-noised spectrum. Third, the correlations between transmitted and received data are calculated to quantitatively evaluate the data quality. Finally, high quality received data are selected by setting a proper threshold of correlation. We applied our approach to measured CSEM data. As a conclusion, the results obtained using our scheme are greatly improved over the previous.