The Oligocene middle Frio Formation is a major hydrocarbon producer in the U.S. Gulf Coast. In the area of the Stratton and Agua Dulce fields, the middle Frio Formation consists of multiple vertically-stacked reservoir sequences (Figures 1 and 2). The target for this study was the basal part of the middle Frio Formation (BMF) interval between the G2 (top lower Frio) and the F11 horizons (Figure 3). The structural setting of the middle Frio in the study area is predominantly growth faults and associated rollover anticlines. The objective of this work is to show how 3D seismic data acquired on the Texas Gulf Coast images subsurface structure that was impossible to fully interpret on 2D seismic and well logs.