oa Dual Sensor Seismic Examples from Around the Middle East

New dual-sensor streamer 2D data have been compared to legacy conventional streamer data<br>throughout the Middle East (Cyprus, Egypt, Lebanon, Libya, and Saudi Arabia) to analyze the<br>differences and quantify the improvements in seismic resolution. A comparison of PSTM stacks after<br>processing through the same flow of the vintage hydrophone data and the up-going pressure field (Pup)<br>showed in general a higher signal-to-noise ratio and better resolution of the P-up image. Spectral<br>analyses quantified the amplitude versus frequency level and showed a significant increase of low and<br>high frequencies. The low frequency enhancement was particularly significant deeper in the sections<br>with spectacular penetration below the highly reflective Messinian Salt/Mansiyah Formation layers.<br>The dual-sensor streamer measures the pressure wave field using hydrophones and simultaneously the<br>vertical component of the particle velocity using motion sensors, overcoming the limitations of<br>hydrophone-only acquisition systems. Its unique ability to de-ghost signals and to optimize data<br>quality, not just for one target depth, but for all depths shallow to deep, promises to significantly<br>improve our customer’s exploration success ratio, well targeting and recovery efficiency. Besides data<br>quality improvements, the streamer is operationally efficient because it records in one pass, with one<br>streamer depth, in seas no other system can handle. The technical benefits of this step change are<br>seen in three key areas: - Enhanced resolution of the final seismic image - Better penetration revealing<br>deeper targets - Improved operational efficiency. The first two points result from the increased<br>bandwidth at both low and high frequencies due to removal of the receiver ghost. The third point<br>results from the ability to tow deeper, which is operationally attractive as weather and operational<br>noise are minimal and the streamers are better behaved.