关键词: MT, 小波分析, 去噪分析

Abstract: Acting as a major method of geophysical prospecting, Magnetotelluric Sounding (MT) is effective in oil and gas prospecting, geothermal survey and deeper earth prospecting. But the undeveloped data processing leads that MT has low resolution, which is the major factor that retards MT from being widely used. There is no method being able to obtain unbiased estimates of the transfer function when there is stonger correlated noise in both the electric and the magnetic time series. Wavelet analysis could decompose the composite signal, which consists of several components of different frequencies, into a series of signal block. So it is an effective method for dissociating the noise from signal. In this paper, we use wavelet analysis to denoise MT data by decomposition and reconstruction. The result is more acceptable than the conventional denoised result.

Key words: MT, Wavelet analysis, Denoising analysis