AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain
Dual Sensor Seismic Examples from Around the Middle East
(1) pgs, Oslo, Norway.
New dual-sensor streamer 2D data have been compared to legacy conventional streamer data throughout the Middle East (Cyprus, Egypt, Lebanon, Libya, and Saudi Arabia) to analyze the differences and quantify the improvements in seismic resolution. A comparison of PSTM stacks after processing through the same flow of the vintage hydrophone data and the up-going pressure field (P-up) showed in general a higher signal-to-noise ratio and better resolution of the P-up image. Spectral analyses quantified the amplitude versus frequency level and showed a significant increase of low and high frequencies. The low frequency enhancement was particularly significant deeper in the sections with spectacular penetration below the highly reflective Messinian Salt/Mansiyah Formation layers.
The dual-sensor streamer measures the pressure wave field using hydrophones and simultaneously the vertical component of the particle velocity using motion sensors, overcoming the limitations of hydrophone-only acquisition systems. Its unique ability to de-ghost signals and to optimize data quality, not just for one target depth, but for all depths shallow to deep, promises to significantly improve our customer’s exploration success ratio, well targeting and recovery efficiency. Besides data quality improvements, the streamer is operationally efficient because it records in one pass, with one streamer depth, in seas no other system can handle. The technical benefits of this step change are seen in three key areas: - Enhanced resolution of the final seismic image - Better penetration revealing deeper targets - Improved operational efficiency. The first two points result from the increased bandwidth at both low and high frequencies due to removal of the receiver ghost. The third point results from the ability to tow deeper, which is operationally attractive as weather and operational noise are minimal and the streamers are better behaved.