Imaged steam zones

In the migrated difference section, and to a lesser extent in the stacked difference section, some seismic features are visible that correlate with the known intervals of steam injection. In the migration difference section, a crisp image of a steam zone reflection is visible at about 165 ms depth (labeled ``S1''), which is near the top of the upper steam zone in the P formation. A fairly strong steam zone reflection (S2) is imaged at the base of the P formation (210 ms), and a much weaker response (S3) correlates with the base of the K formation (245 ms). These steam zone reflections are obtained by migrating the diffraction responses D1-D3, and are likely to be direct evidence of steam accumulation.