A solution gas reservoir is a type of natural gas reservoir that contains mostly dissolved gas in oil. There are several other terms that can be used interchangeably with solution gas reservoir, including gas cap reservoir, gas-capped oil reservoir, and gas-condensate reservoir. All of these terms refer to reservoirs that have a layer of gas overlying a layer of liquid hydrocarbon, which can be either oil or condensate. The gas in these reservoirs may be either free, dissolved, or both. Understanding the different types of gas reservoirs and the terminology associated with them is crucial for the oil and gas industry, as it helps in planning and optimizing production strategies.