Following the completion of Chevron’s acquisition of Hess Corporation, the U.S. supermajor will need to overcome a previously strained relationship with its biggest competitor at home, ExxonMobil, and work together as joint venture partners in the hottest oil province in the world, Guyana’s offshore oil treasure trove. Chevron’s foray into the fastest-growing exploration and production spot globally could also be a sign of what’s to come for the biggest international oil and gas majors. Big Oil may be looking to acquire…