Operations in our South Texas core area began in 1989 when we obtained majority interests in a number of wells producing from the tight Olmos sand in the AWP field in McMullen County. We subsequently enlarged our presence in the field and drilled hundreds of vertical wells in the Olmos sand through 2008. Thereafter, we largely converted to horizontal drilling prompted by the increasing availability of advanced horizontal drilling technologies, together with improvements in the hydraulic fracturing and geoscience technologies. In 2007, we expanded our South Texas area with the acquisition of interests in other wells producing primarily from the Olmos sand in the Las Tiendas field in Webb County and the Sun TSH field in La Salle County, as well as other interests that we subsequently sold.
In 2009, we initiated a horizontal drilling program to the Eagle Ford shale formation lying below the Olmos formation in the AWP field in McMullen County. At the same time we initiated a horizontal drilling program to the Eagle Ford formation below the Olmos formation in the Las Tiendas field in Webb County, with the Eagle Ford formation being identified as the Fasken field. Subsequently, in 2010, we began a horizontal drilling program to the Eagle Ford formation below the Olmos formation of the Sun TSH field in La Salle County, with the Eagle Ford formation in that location being identified as the Artesia Wells field.
The reserves in the Eagle Ford formation in the Fasken field consist of dry natural gas, while those in the Artesia Wells field and the AWP field consist of a mixture of liquids and gas.
Source: Company Data