1. adj. [Geology]

Pertaining to an oil field, 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,  reservoir,  seal,  trap

2. adj. [Geology]

Pertaining to the surface area above a subsurface oil accumulation.

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