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Figure 1. Segment (a) of a seismic section from the Montney-Dawson area in British Columbia, Canada. Equivalent impedance sections from (b) band-limited, (c) colored inversion, and (d) model-based techniques are shown correlated with two impedance logs. The log curve on the left was used in the inversion process, while the curve on the right serves as a blind well test. A litho-column is inserted alongside the log curve to the left as shown in Figure 1b. Notice the low impedance zones on the log curves corresponding to the salt, and the sand intervals correlate well with the low impedance seen on the impedance sections.