This is the predominant rock type in the FDD upper Morrow reservoirs of the shallow shelf areas of the Texas and Oklahoma panhandles where it is oil-prone. This is a common component of most tidal flat and lower delta-plain environments. More or less concentric hydrocarbon zones, truncated to the south by the Mountain View fault system, have the highest vitrinite reflectance values in an area of high temperature methane. The highest weight percent organic carbon is also in the deepest part of the Anadarko Basin, although sample locations are much less dense than for the vitrinite reflectance data. Based on the amount of organic carbon, possible local sediment influx was from a southwestern source, which is probably true for the upper Morrow.
Authigenic carbonate is an important consideration when completing a well.
Authigenic kaolinite and chlorite in Morrow sandstones can cause severe production problems. Kaolinite dislodged during fluid surges can plug pore throats, thereby reducing permeability. Such damage can often be overcome by standard massive fracture treatments. Kaolinite content decreases into the deeper part of the Anadarko Basin. Chlorite is probably the most harmful and most abundant authigenic clay in the Morrow.