Steam leak

A notable exception to the repeatable nature of the overburden is the thin anomaly in the migration difference section at the center of the profile, labeled ``B'' at about 750 ms pseudodepth. This anomaly may be the effect of a steam leak in the shallow portion of the injection well. The subsequent heating and desaturation around the borehole region would be likely to cause such a narrow vertical band of time delay in the center of the profile. Later migration profiles show this region to extend vertically with calendar time.