Determination of subsurface interval velocity is important for imaging by prestack migration, AVO studies and full waveform inversion. We propose a method which uses depth migrated gathers directly, and does not necessarily need a depth model. The approach is complementary to horizon based tomography. When a subsurface model can be identified, model-based tomography seems appropriate since it produces geologically constrained updates. However, if no depth model can be determined initially, a grid based approach is advisable, where one can update an interval velocity section without building a depth model.
|Number of pages||4|
|State||Published - 1997|
|Event||1997 Society of Exploration Geophysicists Annual Meeting, SEG 1997 - Dallas, United States|
Duration: 2 Nov 1997 → 7 Nov 1997
|Conference||1997 Society of Exploration Geophysicists Annual Meeting, SEG 1997|
|Period||2/11/97 → 7/11/97|