The joint Bureau-PEMEX Exploration and Production study of the Macuspana and Veracruz Basins in Eastern Mexico was completed in December 2001. The gas plays in the Miocene-Pliocene section of the on-land and offshore portions of the basins were defined and assessed during this 20-month project. The multidisciplinary, integrated study provided a regional synthesis of the geological framework, petroleum systems, and petrophysical and engineering characteristics of the basins. The study involved close cooperation and participation of PEMEX management and staff.