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1. prep. []

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: dipdipping bedgas-oil contactoil-water contact

Schematic cross section of updip and downdip.