Figure 4. A time slice through the Poisson’s Ratio perturbation cube from 3-D prestack inversion. The well symbol shows the location of the well of Figures 1 and 2. This slice intersects the reservoir centered at a depth of 9560 ft. Prestack inversion indicates an anomalous (large) decrease in Poisson’s Ratio for this Lobo reservoir. This is consistent with Poisson’s Ratio log data in Figure 2.