Chevron and Spain’s Repsol have quit exploration at two offshore blocks in Mexico waters after early work suggested there are not enough resources to make it worthwhile to continue. The two had won the rights to explore the blocks at a tender during the tenure of Mexico’s previous administration, Reuters reported. Now, Chevron told the Mexican energy regulator its work at the deepwater block offshore the state of Tabasco had yielded no promising results, while Repsol never conducted any meaningful exploration work at the shallow-water…