The Raton Basin is the southernmost classical Laramide basin in the Rocky Mountain region and straddles the New Mexico-Colorado state line. As an asymmetric basin, deeper to the west, its central portion lies at the western end of Las Animas County, Colorado. Over 1900 bottom-hole temperatures (BHTs) were compiled from the logs of 1886 wells in Las Animas County, most of which were drilled over the past fifteen years, and are associated with the extraction of coalbed methane, primarily from Upper Cretaceous and Paleocene formations.
Most of the wells from which the BHT data were collected were drilled in about a day using air percussion rotary rigs, and to depths of less than 1100 m (3600 ft). The exclusive use of air in drilling many of the shallower holes and short drilling times deviates from conditions for which general temperature corrections for the effects of drilling were derived. However, even before correction, the data show significant coherent trends.
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