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Coil Shooting Single-Vessel Full-Azimuth Acquisition

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Full-azimuth acquisition provides improved illumination for complex subsurface imaging

Coil Shooting single-vessel full-azimuth (FAZ) acquisition is a technique which extends conventional multi- and wide-azimuth (MAZ and WAZ) survey capabilities by acquiring marine seismic data using a single vessel sailing in a series of overlapping, continuously linked circles. This delivers a greater range of azimuths and offsets than parallel WAZ geometries, resulting in better target illumination without non-productive intervals for line changes. The WesternGeco application of this technique is enabled by the Q-Marine point-receiver marine seismic system:

  • The Q-marine system’s fin-steering devices accurately control the depth and lateral position of the streamers.
  • A fully braced acoustic positioning network provides accurate positioning information for all in-sea equipment.
  • Single-sensor recording and proven noise attenuation methods handle the full range of observed crossflow noise without harming signal fidelity.

Coil shooting enables greater azimuthal coverage in Gulf of Mexico

Typically, WAZ surveys are conducted using three or four vessels, each traveling in parallel lines; however, while conducting a project in the Gulf of Mexico (GoM), WesternGeco achieved high-quality FAZ recordings with a single vessel acquiring seismic while following a circular path. WesternGeco continues to lead the way, streamlining and enhancing techniques with customer needs in mind. Dual Coil Shooting multivessel full-azimuth acquisition uses multiple source and receiver vessels sailing in interlinked circles and offers ultra-long offset FAZ data.

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