1. 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.

2. adj. [Geology]

Pertaining to the surface area above a subsurface oil accumulation.


  1. http://www.glossary.oilfield.slb.com/en/Terms/o/oilfield.aspx