Streamer Steering
Time-lapse (4D) acquisition
Q-Marine uses a unique system that provides lateral streamer steering in addition to depth control. The ability to steer horizontally provides close and constant streamer separation giving improved crossline sampling and the ability to steer for optimal subsurface coverage and repeatability from survey to survey.The Q-Fin streamer steering device enables reliable and repeatable vertical and lateral cable positioning.
The objective in the example(right) was to shoot the survey with the minimum variation of streamer feathering from a fixed, chosen feather angle (in this case zero degrees feather). The goal in this case was to provide a dataset that would be easy to repeat, in terms of source and receiver position, at a later date. The deviation from a desired feather angle was measured on each shot. Results for the entire survey were computed and are illustrated in the histogram below. The histogram shows that within the -2- to +2-degree range, 69% of the shots recorded feather angles less than 0.2 degrees off zero feather. Near zero feather was, therefore, achieved for the majority of the survey.
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