Figure 3. (a) Vertical slice from a fast-S volume. (b) Equivalent vertical slice from the companion slow-S volume. A and B are reflections from fractured carbonate reservoirs. Horizons aa through ff are used to measure fast-S and slow-S time thicknesses and amplitude attributes across fractured intervals A and B. SR1 and SR2 define image coordinates where slow-S reflectivity diminishes but fast-S reflectivity does not. T1 and T2 define locations where a fractured interval shows an increase in time thickness in slow-S space that is not observed in fast-S space.