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Q tomography with ray and wavesNormal access

Authors: Y. Shen, K. Bao and H. Kuehl
Event name: 80th EAGE Conference & Exhibition 2018 Workshop Programme
Session: WS07: Seismic Imaging with Ray and Waves - Where do we stand? Part II: Imaging
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801914
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 633.91Kb )
Price: € 20

Summary:
Seismic wave propagation can be simulated using ray-based methods or wave-equation-based methods. Ray methods are based on high frequency approximation. Those methods work well in a geological setting with smooth velocity variation in the subsurface. However, ray-based methods can fail in imaging the complex media e.g., below or near salt, where wave-equation-based methods are known to be more robust for imaging. In this study, we examine the advantages of the wave-equation-based method over the ray -based method in the case of Q tomography in a complex setting. We employ a synthetic model that has salt bodies with rugose salt boundaries. Two attenuation anomalies are included: one is above the top of salt; the other one is close to the steep salt flank. We measure the attenuation effects from the spectral loss of the seismic events at near offsets (0 m - 600 m) and at mid offsets (600 m -1,200 m). We then do a least-squares inversion of the same measurements to update our Q model using ray- and wave-equation- based tomography. Through the numerical tests, we would like to study how the complex overburden impacts Q inversion differently in ray- and wave-equation based tomography.


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