Octavio Romero also pledged to halt what he called the "dismantling" of the Mexican state-run company that has taken place in recent years.
Santa Cruz oil field provides Melbana with an accelerated path to potentially becoming an oil producer and booking reserves in Cuba
Some 35,137f3/d (994M3/d) will be available to bidders along the Sincelejo-Cartagena section of the Promigas transport system.
The country has been applying measures to increase the number of small and medium-sized companies in its oil and gas market.
The deal was closed with Murphy making a net payment of US$795mn to Petrobras