Question

Petroleum gas always collects below the petroleum in an oil well.​

Answer 1

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:$\implies$Petroleum is a crude oil.It occurs under the seas and oceans after millions of years by the decomposition of dead remains of plants and animals.

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Answer 2

Answer:

Natural gas always collects above the petroleum in an oil well.

Explanation:

Natural gas is found in deep underground rock formations or associated with other hydrocarbon reservoirs in coal beds and as methane clathrates. Petroleum is another fossil fuel found close to and with natural gas. Most natural gas was created over time by two mechanisms: biogenic and thermogenic.