Rugged surface topography for land seismic data presents a challenge in imaging near-surface and subsurface complex geologic structures in foothills. Conventional static correction process that simply shifts the data to a flat or floating datum distorts the wavefield and thus produces the inaccurate image. Migration from topography without static correction is apparently an ideal solution to the imaging of complex structures with a rugged topographic surface. The image result obtained from the migration directly from topography is significantly improved for near-surface and subsurface structures on a synthetic overthrust dataset in the foothills of Canadian Rockies. A hybrid reverse-time migration also produces clearer image for near-surface structures around the topographic surface than the conventional reverse-time migration.
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