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Q-Tomography: Status and ChallengesNormal access

Authors: F. Gamar-Sadat, A. Pintus, P. Guillaume and A. Wright
Event name: 81st EAGE Conference and Exhibition 2019 Workshop Programme
Session: WS01 Attenuation: Challenges in Modelling and Imaging at the Exploration Scale
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901913
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 359.97Kb )
Price: € 20

Summary:
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 material or gas, the need for a more complex 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.


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