Benefits of two‐boat 4D acquisitionAuthors:
In February 2007 Woodside acquired a two boat, push reverse 4D monitor survey. Two‐boat push reverse acquisition was used to maximize 4D repeatability and minimize 4D infill in a survey area known for strong, unpredictable currents. The source and receiver positional repeatability obtained in the monitor is good with a mean |Dsrc|+|Drec| of 27m at the target offset of 1900m. Survey infill is only 7% compared to a predicted infill of 30% to achieve the same 4D coverage with one boat acquisition. Shortcomings of the two‐boat push reverse technique include a large minimum near offset of around 500m and a receiver motion 4D error when matching to the conventional one boat baseline survey. Preliminary processing results indicate an NRMS of 20–25% which is expected to be reduced to below 20% in the final processing.