in the news on the websiteI clicked on the 'In the News' section on the Rango website and watched the flyover of the California oil fields. I'm about 90% sure that is the Lost HIlls Field they are flying over (correct me if I am wrong but I've seen it with my own eyes when stopping for a burger).
That field is directly south of the Middle dome, as Lost Hills= the south dome. I am pretty sure the middle dome will be covered with pumpers like that one day!