Triple Source

Triple-source has replaced dual-source as the norm for seismic because it provides better spatial crossline sampling for high-resolution imaging, or greater streamer separation and thus greater acquisition efficiency. The method is usually combined with continuous recording and overlapping shot records.

Most seismic surveys today deploy a triple-source setup. The introduction of this configuration has increased operational efficiency.

  • Better crossline CMP sampling, for a given streamer separation, provides images with improved spatial resolution
  • Permits wider streamer separation and overall spread width with no reduction in crossline sampling
  • Enables reduction in deployed streamer equipment for the same streamer spread width and same crossline sampling 

 

  

triple source configuration

The illustration shows the source-streamer ray path contributions to each subline (CMP location) for triple-source shooting with 150 m streamer separation. Source separation is 50 m and crossline bin width (subline separation) is 25 m. The black diamonds represent the streamers and the blue rectangles represent sources. The crossline subsurface illumination is illustrated by the horizontal illumination bar at the bottom.