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What is associated vs. non-associated natural gas?

Associated (or associated-dissolved) gas is natural gas that is produced along with crude oil, and typically separated from the oil at the wellhead. In contrast, non-associated gas is produced from a well in conventional gas fields that do not produce crude oil.

There is also a third category of natural gas production, continuous (or unconventional) gas, that occurs as basin-centered gas, coal-bed gas, shale gas, fractured-reservoir gas, and tight-reservoir gas.

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