These two cross-sections show the vertical resolution of 3-D seismic. The top of the reservoir is the magenta colored horizon in the middle. There are 14 milliseconds of closure from the top of the reef to the spill point. Using a seismic velocity of 20,000 feet per second, this means the reef is about 280 feet tall. Notice on the B-B' strike cross-section the center reef is not as tall as the reef on either side, both of which have been produced as gas wells. A significant risk factor is the pressure in all three reefs are connected, and as the other two reefs were produced it produced the center reef. We still calculated a Ps (Probability of Success) of 80%. This well has not been drilld yet, largely because gas prices have been so low since the discovery of the giant resource plays like the Marcellus, Vicksberg, and Bossier. One of the downsides of working in natural resourse exploration is that as a large new resource is discovered, it drops the price and smaller opportunities become uneconomic to drill until the resource again becomes scarce. (Shackelford structure map and attribute map)