Geologists apply their knowledge of the earth and its structures to help find and extract oil and gas. Although geologists are usually tied to the location of deposits, they are involved in all aspects of discovery and production. Geologists look at structure and sediment, as well as interpret other geophysical information to help make decisions on where to drill. They must understand the origin, amount and movement of oil as well as any obstacles that may be in the way of deposits before drilling can begin. Geologists will help find deposits all over the world including on land and under the ocean. A strong geoscience background is required for these types of positions.