Improving the efficiency of seismic exploration systems based on the use of pseudo-random sweeps: Mathematical modeling

The study explores the potential to improve seismic imaging resolution using broadband pseudorandom sweep signals and outlines the corresponding requirements for seismic acquisition systems. We analyze the quality of the resulting seismic images of a 2D inhomogeneous velocity structure using a synthetic vibroseismic dataset modeled for a series of sweep signals constructed based on pseudorandom code sequences (PRCS) of mechanical load pulses. The study demonstrates that the detailed seismic images showing main reflecting boundaries can be recovered by means of correlation processing of the vibroseismic data. It can be seen, through their comparison with single-pulse mode seismograms, that the imaging accuracy achieved with a particular PRCS sweep signal primarily depend depends on the pulse duration.