Long-Wavelength Statics Estimation from Guided Waves

E033 Long-Wavelength Statics Estimation from Guided Waves F.E. Ernst* (Shell International Exploration & Production BV) SUMMARY The near surface often consists of weathered unconsolidated low-velocity layers which significantly distort the wave field. Static corrections may mitigate these effects. Whereas errors in short-wavelength statics reduce the signal-to-noise ratio of the stack errors in long-wavelength statics influence the structural image. This is especially a concern when the exploration target is a low-relief structure in an area with rough topography or complicated near surface. In some areas in the Middle East longwavelength statics may be 80-90 ms e.g. due to sand dunes. Predominantly