1. n. [Geology]

An accumulation, pool or group of pools of oil in the subsurface. An oil field consists of a reservoir in a shape that will trap hydrocarbons and that is covered by an impermeable or sealing rock. Typically, industry professionals use the term with an implied assumption of economic size.

See related terms: accumulation,  field,  hydrocarbon,  oil pool,  oilfield,  reservoir,  seal,  trap

2. n. [Geology]

The surface area above a subsurface oil accumulation is called an oil field.

See related terms: accumulation,  field,  hydrocarbon,  oil pool,  oilfield,  reservoir,  seal