METHODS AND SYSTEMS THAT ATTENUATE NOISE IN SEISMIC DATA

摘要

Methods and systems that attenuate noise in seismic data. In one aspect, noise attenuation methods iteratively generate a low-speed noise model of low-speed noise recorded in the seismic data. The seismic data is arranged into a sparse seismic-data matrix. Low-speed noise refers to noise that propagates at speeds less the speed of sound in water. The low-speed noise model includes the low-speed noise and includes interpolated low-speed noise that approximates portions of the low-speed noise typically affected by spatial aliasing and streamer surface irregularities. The low-speed noise model may be subtracted from the sparse seismic-data matrix to obtain a noise-attenuated sparse seismic-data matrix.

主权项

1. A method to attenuate noise in seismic data, the method comprising:
generating a sparse seismic-data matrix from the seismic data; transforming the sparse seismic-data matrix from a space-time domain to a transformation domain to generate a spectrum; determining a signal region of the spectrum; muting amplitudes in the signal region to generate a partial noise spectrum of the spectrum; iteratively determining a low-speed noise model based on the partial noise spectrum, the low-speed noise model includes noise that propagates at speeds less than the speed of sound in water and interpolated low-speed noise that represents noise affected by spatial aliasing and streamer irregularities; and subtracting the low-speed noise model from the sparse seismic-data matrix to generate noise-attenuated sparse seismic-data matrix.