1. prep. [Geology]

Located down the slope of a dipping plane or surface. In a dipping (not flat-lying) hydrocarbon reservoir that contains gas, oil and water, the gas is updip, the gas-oil contact is downdip from the gas, and the oil-water contact is still farther downdip.

Antonyms: updip

See related terms: dip,  dipping bed,  gas-oil contact,  oil-water contact