Investors are more worried about the outcome of the 2018 presidential election than insecurity in Mexico, according to Héctor Arangua, a partner at law firm Nader, Hayaux & Goebel in Mexico City.
A report by the New York-based Natural Resource Governance Institute says the Brazilian and Colombian governments offer "satisfactory" laws and practices for oil and gas companies.
The new model aims to attract new players to finance infrastructure projects
The US will reportedly seek a new energy pact as part of the renegotiation of Nafta, which Donald Trump has lambasted and threatened to quit.
The US$2.5bn deal involves the acquisition of Brazilian miner Vale's fertilizer assets by US-based Mosaic.