Schlumberger

Technical Paper: New Marine Towed-Streamer Acquisition Technology

Society: OTC
Paper Number: 24001
Presentation Date: 2013
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Abstract

Two of the main limiting factors in seismic resolution for marine towed-streamer acquisition are the ghost effect and sparse crossline sampling of the streamers. The ghost is the reflection from the sea's surface that interferes constructively or destructively with the primary reflections, reducing the seismic bandwidth at the low and high ends of the spectrum.

The following acquisition and processing solutions to address the receiver ghost problem were introduced in early 1980s and again in the last 5 years.

  • slant streamer (Ray and Moore, 1982)
  • over and under streamers (Sønneland, et al., 1986)
  • hydrophone-vertical geophone streamers (Carlson, et al., 2007)
  • variable receiver depth acquisition and processing (Soubaras, 2010; Moldoveanu, et al., 2012).

A new towed-streamer technology, based on multimeasurement acquisition, was introduced in 2012 to address both temporal and spatial resolution.

The concept of multimeasurement towed streamers, introduced by Robertsson, et al. (2008), involves a system that measures pressure with hydrophones and particle acceleration in crossline and vertical directions with accelerometers. The multimeasurement streamers provide measurements of pressure and gradient of pressure in two directions. Based on these measurements, wavefield separation of upgoing and downgoing components can be performed simultaneously with crossline wavefield reconstruction (Özbek, et al., 2010). The multimeasurement system enables calculation of the 3D upgoing wavefield at any desired position within the spread and allows improving the temporal bandwidth and the spatial bandwidth. Multisensor streamers can be deployed at larger depths, improving low-frequency content, signal-to-noise ratio due to reduced swell noise, and acquisition efficiency. Operational efficiency can be improved by using multimeasurement towed-streamer data to detect and eliminate seismic interferences (Vassallo, et al., 2012).

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