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Q-Tomography: Status and Challenges
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019 Workshop Programme, Jun 2019, Volume 2019, p.1 - 3
Abstract
Almost all current time or depth seismic studies need to go through a correction process to recover energy lost by absorption phenomenon. The so-called Q factor is responsible for dissipation of high-frequency seismic energy, which decreases seismic amplitudes and causes velocity dispersion. For general background Q, a post-migration inverse Q filtering ( Wang, 2002 ), using smooth or even constant Q, may be sufficient for data with gentle geology. In areas with more absorptive heterogeneities such as unconsolidated materialor gas, theneed for a morecomplex Q model is necessary for an accurate correction. Brzostowski and McMechan (1992) have been pioneers for addressing this problem, adapting Q-Tomography from fundamental to applied seismology. Over the last decade, it has resulted in an industrial solution ( Cavalca et al., 2011 ; Valenciano and Chemingui, 2013 ; xin et al., 2014 ; Gamar et al., 2015 ) using VSP or surface seismic data.