Traveltime curves

The traveltime picks for all six surveys are displayed together as traveltime curves in Figure 27. Each curve is labeled with its number in the series of time-lapse surveys. For example, label ``2'' means the picked curve from the second monitor survey, after 5 months of steam injection. It is evident from these curves that there is a lot of time delay in the center at the steam injector, and the time delay increases with calendar time. Also notable is the fact that the first three monitors show a time pull-up to the west of the injector, which would correspond to a pressure front. Directly to the east of the injector, a small time pull-up might be indicative of a hot water ring of condensed steam. Farther to the east, relatively small time changes are evident, suggesting the reservoir is at ambient conditions there.