Well-covered ground?

Usage examples of oilfield.

Persian Government, General Quinan, who was commanding in Iraq, had been ordered on July 22 to be ready to occupy the oil refinery at Abadan and the oilfields, together with those two hundred and fifty miles farther north near Khanaqin.

Of the companies that were so willing to give me every facility I would like to thank, in particular, Trans-Canada Airlines and Canadian Pacific for making it possible for me to travel at will regardless of currency difficulties, and Imperial Oil for giving me the freedom of the new big oilfields of Alberta and going to endless trouble in taking me round their rigs and introducing me to the whole process of drilling.

Mikolashek needed to seize the Rumaylah oilfields, among other tasks, and he wanted to catch the Iraqi ground forces unaware.

He will be remembered affectionately by the hunters, miners and loggers, as well as the tourists, who visited him in his mountain kingdom and listened to his stories of the oilfields and heard him make the surrounding peaks ring with the skirl of his pipes.

I'm a denizen of the concretest jungle in the world, and though I've been to a hell of a lot of countries, it's been mostly cities, or with mobs of people around - camps, mines, oilfields, anywhere there's a news story to cover.

The only way to be sure you're sitting on an oilfield is to drill down and find out.