Above is an example of a crossplot between Terrace Amplitude and Terrace Thickness. First a baseline is defined which represents the maximum amplitude values expected if no tuning had taken place (yellow line). Points with amplitude values above the baseline are those thought to be boosted by tuning. The baseline has a constant amplitude value at thicknesses greater than or at tuning thickness and then slopes to zero below tuning thickness. The turning curve (red line) encompasses the majority of points, including the high amplitude values thought to be boosted as the result of tuning (reference to Brown et al. 1984,1986).
Above are two tuning volumes and terrace amplitude volume mapped on the same horizon. In the map with terrace amplitude, you could see that within our target reservoir area (within polygon), it shows high amplitude area where we could not differentiate the area of true amplitude and tuning amplitude. With the tuning volumes, we could tell where tuning area and anomaly area. This helps in deciding well placement in the future and avoid DHI pitfalls in amplitude.