Answer: near methane clathrates and oil deposits.
Explanation:
Natural gas can be defined as a naturally producing hydrocarbon gas which consists of methane, higher alkanes, carbon dioxide, hydrogen sulfide, helium and nitrogen.
These are found near the hydrocarbon reservoir in the methane clathrates. These are the sedimentary structures which consists of compost of sea debris. The methane hydrates leak out from these structures and which liberates the methane gas in air.
The natural gas can also be found near the oil deposits.
