During the war large petroleum deposits were discovered.

Test drilling and possible fracking for suspected petroleum deposits were proposed in 2012.

Finally, an 8-inch (20-centimeter) bit bores the rest of the way to the petroleum deposit.

Major new petroleum deposits were discovered on the Gulf of Mexico coast.

Recently, a significant amount of petroleum deposits have been discovered in the ground and under the lake near Butiaba.

Its oceans are very small and consequently hold few petroleum deposits.

It was historically one of the most important petroleum deposits in Wyoming.

There are occasional reports of petroleum deposits in Cuba's offshore waters.

Velikovsky argued that the earth's petroleum deposits came from comets.

Canada's oil sands and heavy oil resources are among the world's great petroleum deposits.