Abstract:Broadband seismic processing technology can effectively broaden the data frequency band and improve the resolution of seismic data. As one of the main means of marine broadband seismic data processing, the de-ghosting method is greatly sensitive to parameters such as water depth and the speed of sound, and the spectral morphology of data after de-ghosting is often significantly different, which makes it difficult to accurately interpret seismic data. Therefore, on the premise of fully considering the energy distribution of each frequency component of broadband data, a broadband seismic wavelet optimization method from the perspective of octaves was proposed. Firstly, the loga-rithm of each frequency value was taken, and a smooth amplitude spectrum curve was constructed in the octave coordinate system. Then, the curve was transformed into the ordinary coordinate system, and the broadband wavelet was reconstructed with the zero phase. Finally, a broadband seismic wavelet with clear physical meaning was obtained, which is referred to as an “octave wavelet”. The practical application results show that the wavelet proposed can be applied to the wavelet shaping of broadband seismic data after de-ghosting, and it can eliminate the spectral morphological difference caused by the change in parameters during de-ghosting and improve the quality of seismic profiles.
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