Steam zone diffractions

Three sets of large amplitude diffractions are visible in the stacked sections of Figure 6, labeled ``D1-D3''. The D2 diffraction appears to have the strongest amplitude. Its location at 200 ms depth corresponds almost exactly with base of the upper steam zone in the P formation (Figure 2). The D1 and D3 diffractions are weaker than the D1 diffraction, and correspond to the top of the P formation (165 ms) and base of the K steam zone (240 ms) respectively. These diffractions are probably due to the concentrated zones of steam, as will be demonstrated in the seismic modeling and interpretation section of this paper.