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A unified 2D land seismic data analysis workflow
- Source: First Break, Volume 25, Issue 2, Feb 2007,
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- 01 Feb 2007
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Abstract
Oz Yilmaz, GeoTomo, Houston, describes a time-with-depth workflow for earth modelling and imaging in areas with irregular topography, complex near-surface, and complex subsurface based on analysis of seismic data in shot-receiver coordinates, not in midpoint-offset coordinates. Seismic data acquired in areas with irregular topography, complex near-surface, and complex subsurface require a customized analysis workflow. A near-surface is usually defined as a relatively unconsolidated, low-velocity soil column with less than 30 m thickness. Nevertheless, there are many areas where the near-surface thickness and velocities may vary significantly along the seismic line traverses. Additionally, a near-surface zone may include high-velocity outcrops and layers with vertically varying velocities.