Associated Gas is a natural gas found in contact with or dissolved in crude oil in the reservoir. It can be further categorized as Gas-Cap Gas or Solution Gas.
Natural gas found mixed with oil in underground reservoirs, that comes out of solution as a by-product of oil production. In these fields, natural gas production fluctuates with oil production.
Gas combined with oil. Known also as gas cap gas and solution gas, it provides the drive mechanism needed to force oil to the surface of a well. Associated gas is normally present in an oil reservoir in the early stages of production.
Associated Gas has been defined 6 different ways in documents like Terms Used in Petroleum Reserves/Resources, LNG: a glossary of terms, Glossary of Terms, and 3 more.