Schlumberger

Technical Paper: Designing, Acquiring and Processing a Multivessel Coil Survey in the Gulf of Mexico

Society: SEG
Paper Number: 118
Presentation Date: 2011
 

Abstract

A survey using a unique multiple vessel dual-coil design was shot in the deep-water Gulf of Mexico in the latter part of 2010. The survey was designed to efficiently acquire high-quality subsalt images in a poor data area by recording full-azimuth, highfold data with offsets in excess of 12 km. A new noise attenuation technique combined with linearly adaptive coherent noise attenuation (LACONA) was used with point-receiver data to remove the higher levels of noise recorded in coil data. Lateral streamer steering kept the streamers on the circular pre-plot lines and maintained constant streamer separation. Predominantly conventional coordinate-based data processing techniques and flows were used, although some modifications to individual steps were required to deal with the increased data volumes and fold pattern inherent in this design. Fast-track processing results produced onboard the recording vessels that compare existing wide-azimuth datasets with the coil data show improved base-of-salt definition and better signal-to-noise ratio. Ongoing refinement of the Earth model and anisotropic migration is expected to yield further improvements in image quality.

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