Petroleum reservoirs typically yield only a fraction of the oil initially in place because geologic heterogeneity causes incomplete drainage of oil.

The Salado-Tansill and Alibates Formations are the youngest evaporite and carbonate facies within a thick Permian sequence of evaporites, carbonates, and red beds in the Texas Panhandle.

In Texas, the Lower Cretaceous was deposited on an extensive broad, flat platform which extended from the Stuart City shelf margin on the downdip or seaward side to the area of Abilene in North Texas on the updip or landward side (fig. 1).

The objectives of this symposium [were] (1) to bring together individuals from universities and industry who have conducted research on Cretaceous carbonates, in order to accelerate communication, exchange ideas, and discuss differences of opinion; (2) to emphasize subsurface carbonate studies bu