--> --> Salt-Related Converted-Wave Identification and Attenuation - Offshore Egypt, Mediterranean Sea

AAPG Africa Region, The Eastern Mediterranean Mega-Basin: New Data, New Ideas and New Opportunities

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Salt-Related Converted-Wave Identification and Attenuation - Offshore Egypt, Mediterranean Sea

Abstract

Abrupt and large changes in the earth properties (velocities) can cause conversion of the compressional waves to converted mode energy. Such converted waves could be recorded on the towed streamer seismic data. If they are not identified and removed early, they can mislead the interpretation. In this paper, we are showing the successful application of the converted wave attenuation (CWA) workflow on the seismic data from the Mediterranean Sea, Offshore Egypt. Data is acquired with the latest broadband technique and went through several iterations of velocity model building. The presence of the strong converted waves has threatened to undermine velocity model building and interpretation efforts. The benefit of the presented workflow is that it identifies and models the converted energy pre-stack pre-migration, however the subtraction is done pre-stack post-migration. Post-imaging subtraction gives improved flexibility in signal protection and improvements in the S/N ratio, especially in the areas where the separation of the converted mode and compressional energy is small. The presented workflow is universally applicable to any areas where the converted modes occur.