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3D Wavefield Imaging In The Deepwater Gulf Of Mexico
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 7th International Congress of the Brazilian Geophysical Society, Oct 2001, cp-217-00010
Abstract
When complex structures with large velocity contrasts are present, wavefield techniques can provide improved imaging (structure, amplitude, and phase) over the more traditional Kirchhoff integral methods. Wavefield techniques rely on two elements: firstly, an advanced acquisition design with complete azimuthal coverage; and, secondly, wave equation based prestack<br>imaging methods. Together, these two elements offer improved seismic imaging in complex structural environments by better handling of multipathing, amplitudes and phase. A wavefield<br>experiment was conducted last year in a complex subsalt area of the deepwater Gulf of Mexico using a full-azimuth vertical cable acquisition strategy. Here, we discuss some of the unique<br>challenges associated with wavefield imaging such as velocity analysis and residuals correction. Finally, comparisons will be shown between conventional Kirchhoff imaging and wavefield imaging.