But may not be able to tap it for security reasons. The Mexican government recently changed laws so foreign companies can bid for drilling rights. However, with the current low oil prices and the danger of the drug cartels, may not be able to use them. It already has a problem with constant intrusions into their pipeline systems where people drain off huge amounts of fuel.
Read more of the long article @ Mexican Energy Reform A Security Nightmare for Multi-Nationals Operating in Mexico Small Wars Journal