WAZ wavefield de‐remigration illumination analysis and sub‐salt model building

Droujinine, Alexander; Salomons, Boudewijn; Daalen, Diederik van; Kuiper, F. G.

doi:10.1190/1.3064102

Cited by 1 publication

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“…For the amplitude compensation, directional illumination is needed for a limited acquisition aperture and is critical in balancing the image amplitude, especially for weak interfaces in poorly illuminated regions. Illumination-based true-amplitude, true-reflection migration methods also have been studied extensively ͑Wu et Audebert et al, 2005;Wu, 2005, 2008;Lecomte 2008͒. With new advancements in seismic acquisition for 3D surveys, some illumination studies have been carried out for 3D cases ͑e.g., Fontecha et al, 2005;Alai and Thorbecke, 2008;Droujinine et al, 2008͒ and for a 3D vertical seismic profiling ͑VSP͒ data set ͑e.g., Yu et al, 2005͒. However, the present methods, such as the local planewave decomposition, have poor efficiency for 3D data sets.…”

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confidence: 99%

Directional illumination analysis using the local exponential frame

Mao

Gao

2010

GEOPHYSICS

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We have developed an efficient method of directional illumination analysis in the local angle domain using local exponential frame beamlets. The space-domain wavefields with different shot-receiver geometries are decomposed into the local angle domain by using the local exponential beamlets, which form a tight frame with the redundancy ratio two and are implemented by a linear combination of local cosine and local sine transforms. Because of the fast algorithms of the local cosine/sine transforms, this method is much more efficient than the previously used decomposition methods in directional illumination analysis, such as the local slant-stacking method and the Gabor-Daubechies frame method. The results of directional illumination (DI) maps and the acqui-sition dip responses (ADR) for the 2D SEG/EAGE salt model and the 45-shot 3D SEG/EAGE model demonstrated the validity and feasibility of our method. Compared with the illumination results using local slant-stacking decomposition, the new method produces illumination maps of similar quality, but it does so a few times faster. Furthermore, because of its high computational efficiency and saving in memory usage, the new method makes the 3D directional illumination analysis readily applicable in the industry.

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