Abstract
In February 2007, Woodside acquired a two-boat, push reverse 4D monitor survey over the Enfield oil field offshore Western Australia (Figure 1). Two-boat push reverse acquisition maximizes 4D repeatability and minimizes 4D infill in a survey area known for strong, unpredictable currents. Significant survey planning and focused 4D field expertise resulted in excellent source and receiver positional repeatability with a mean |Dsrc|+|Drec| of 27 m at the target offset of 1900 m. Survey infill is only 7% compared to a predicted infill of 30% to achieve the same 4D coverage with conventional one-boat acquisition. Shortcomings of the two-boat push reverse technique include a large minimum near-offset of around 500 m and a receiver motion 4D error when matching to the conventional one-boat baseline survey. An nrms of 15% was obtained for the final processed data. Due to the success of the 2007 Enfield survey, Woodside is planning a second two-boat monitor survey on Enfield and a two-boat 4D baseline survey on th...
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