Time-lapse Acquisition With a Dual-sensor Streamer over a Conventional Baseline Survey

This paper describes an experiment to validate the use of a dual-sensor streamer for time-lapse acquisition. Dual-sensor streamer data was acquired at an acquisition depth of 15m over five adjacent sail lines that had been acquired using a conventional streamer that records the pressure wavefield at 8m depth some months earlier. The dual-sensor streamer data were processed to obtain the total pressure field at 8m depth. Both these data and the conventional data were then taken through a state-of-the-art time-lapse processing flow. The difference in the final images is very small, as would be expected for two surveys conducted only a few months apart in an area where there is no production. The repeatability is shown to conform to industry requirements, thereby demonstrating that a dual-sensor streamer can be used to perform time-lapse acquisition in areas where earlier surveys have been acquired using conventional streamers.