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Difference between oil and gas field and oil and gas reservoir
An oil and gas reservoir is an aggregation of oil and gas in a single trap with a unified pressure system and oil-water interface, which is the basic unit of oil and gas aggregation in the earth's crust.

An oil and gas field is the sum of oil reservoirs, gas reservoirs, and oil and gas deposits in the same area controlled by a single localized tectonic unit.

So oil and gas fields are much larger in scope.