Between 9 and 13 months, a major fluid flow breakthrough has occurred to the north and west. The steam zone has expanded to the northwest as seen in the time slice of Figure 40. A thermal front has propagated to the west and probably to the north as seen by the velocity model of Figure 33. The pressure front has propagated almost entirely out of the seismic survey area to the west and probably north. Still relatively little is happening to the south and east of the injector.
The width of the steam zone at the base of the P formation is about 80 m at this time. A small steam zone is clearly imaged at the top of the P formation (165 ms) in Figure 36, and a larger steam zone is visible at the base of the P formation (200 ms). A weaker steam zone appears in the migrated image around 240 ms pseudodepth. The temperature logs of Figure 42 indicate that major heating has arrived to the west, but no heat has arrived yet to the east, which matches the time slice of Figure 40.
These results support the hypothesis that the pressure front may be an indicator of which direction future heat flow will preferentially propagate. Initially, the pressure front was observed to the northwest, but not the southeast. Now, the steam and thermal fronts seem to be following the lead of the pressure front and are moving to the northwest also, but not toward the southeast.