gas oil contact

Structure map of a reservoir with gas-oil and oil-water contacts
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1. n. [Geology]
A bounding surface in a reservoir above which predominantly gas occurs and below which predominantly oil occurs. Gas and oil are miscible, so the contact between gas and oil is transitional, forming a zone containing a mix of gas and oil.
Alternate Form: GOC
2. n. [Well Completions]
The interface between the gas and oil phases present in a reservoir formation. During the production of a well, the GOC may move, resulting in undesirable production conditions such as a high proportion of gas that may be too much for surface processing facilities. Monitoring the gas-oil and oil-water contacts is a key element of good reservoir management practices.
Alternate Form: GOC