Chevron has acquired Anadarko Petroleum Corp in a $33 billion deal. Anadarko has been a trailblazer of the US shale revolution which made the nation the world's biggest oil producer. Anadarko's decision to rather agree for this deal than capitalize on oil prices exemplifies the challenges faced by many shale producers. The shale producers like Pioneer, Diamondback Energy and Concho are already facing pressure from the investors to improve profitability.