Approximately 300 reservoirs in the New Mexico part of the Permian Basin have cumulative production of more than 1 million bbls oil (MMBO). These 300 reservoirs had produced a total of 4.5 billion bbls oil at the end of 2000. The reservoirs have been grouped into 17 plays based on geologic parameters, including reservoir stratigraphy, lithology, depositional environment, tectonic setting, and trapping mechanism. There are 10 Permian plays that have a cumulative production of 3506 MMBO, two Pennsylvanian plays with a cumulative production of 424 MMBO, three Siluro-Devonian plays with a cumulative production of 440 MMBO, and two Ordovician plays with a cumulative production of 86 MMBO. During 2000, 40 MMBO were produced from the Permian plays, the Pennsylvanian plays yielded 6.4 MMBO, the Silurian-Devonian plays yielded 1.4 MMBO, and the Ordovician plays gave up 0.35 MMBO.