Wavelet transform filtering in the 1D and 2D for ground roll suppression

Matos, Marcílio Castro de; Osório, Paulo Léo Manassi

doi:10.1190/1.1817158

Cited by 9 publications

(1 citation statement)

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“…Nowadays, joint time-frequency filtering methods, such as the wavelet transform, are widely used to filter undesired noise such as ground roll and air waves (de Matos and Osório, 2002). Filtering is implemented by exploiting the high redundancy of the joint timefrequency representation that, ideally, maps the noise and signal to different regions of the time-frequency plane.…”

Section: Introductionmentioning

confidence: 99%

Relative acoustic impedance from wavelet transform

et al. 2014

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Most deconvolution algorithms try to transform the seismic wavelet into spikes by designing inverse filters that remove an estimated seismic wavelet from seismic data. We assume that seismic trace subtle discontinuities are associated with acoustic impedance contrasts and can be characterized by wavelet transform spectral ridges, also called modulus maxima lines (WTMML), allowing us to improve seismic resolution by using the wavelet transform. Specifically, we apply the complex Morlet continuous wavelet transform (CWT) to each seismic trace and compute the WTMMLs. Then, we reconstruct the seismic trace with the inverse continuous wavelet transform from the computed WTMMLs with a broader band complex Morlet wavelet than that used in the forward CWT. Because the reconstruction process preserves amplitude and phase along different scales, or frequencies, the result looks like a deconvolution method. Considering this high-resolution seismic representation as a reflectivity approximation, we estimate the relative acoustic impedance (RAI) by filtering and trace integrating it. Conventional deconvolution algorithms assume the seismic wavelet to be stochastic, while the CWT is implicitly time varying such that it can be applied to both depth and time-domain data. Using synthetic and real seismic data, we evaluated the effectiveness of the methodology on detecting seismic events associated with acoustic impedance changes. In the real data examples, time and in-depth RAI results, show good correlation with real P-impedance band-pass data computed using more rigorous commercial inversion software packages that require well logs and low-frequency velocity model information.

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Section: Introductionmentioning

confidence: 99%