On the Footprint of Attenuation on Full-waveform Inversion of Land Data - A Case Study from the Polish Basin

摘要

Here we assess the potential of the visco-acoustic frequency domain full-waveform inversion (FWI) to reconstruct P-wave velocity and P-wave attenuation factor (Qp) from onshore seismic data. We show that both the velocity and the attenuation factor can be reliably reconstructed with a comparable resolution and without trade-off for sufficiently attenuating media and sufficiently-accurate velocity starting model by non-linear inversion. We applied both the acoustic and visco-acoustic FWI to real wide-aperture onshore seismic data with a strong footprint of attenuation that were recorded in the Polish Basin. We show how a heuristic normalisation of the data with offset allows us to remove the effect of the attenuation from the data and reconstruct a reliable velocity model in the acoustic approximation.Alternatively, visco-acoustic FWI allows us to reconstruct jointly both a reliable velocity model and a Q model from the true-amplitude data. We find the recovered velocity and Q models consistent with the expected lithology and stratigraphy in the study area. We link high-attenuation zones with the increased clay content and the presence of the mineralized fluids.