We generated 121 60-fold CMP gathers above the reservoir for each of the three waterflood phases. The shot spacing was 25 m and the offset spacing was 50 m. Pressure data were collected in marine streamer geometry with a near offset of 250 m and a maximum offset of 3.2 km. The traces were generated with a record length of 4 seconds at a 4 ms sample interval, with signal content in the 10-60 Hz frequency bandwidth. Random, Gaussian distributed noise was added to each trace independently for each of the three simulated surveys, with a 2:1 S/N ratio at the reservoir reflection pre-flood, and a 1:1 S/N ratio post-flood. This provided us with three synthetic prestack time-lapse seismic monitor surveys with which we analyzed for signs of waterflood activity.