the gas is collect above the oil because it has less dense
This is because natural gas and oil deposits were formed together
Deposits of oil and natural gas.
Asia and Africa
Saudi Arabia has deposits of oil and natural gas in its large desert region. It is one of the largest oil-producing countries in the world and has significant reserves of both oil and natural gas.
North Sea
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Anticline formations can trap oil and gas creating deposits.
Yes, Ukraine does have domestic deposits of oil and gas besides it has large deposits of coal methane and probably the world largest deposits of shale gas. You can get numbers from this paper ENERGY SECURITY CHALLENGES IN UKRAINE A SNAPSHOT-2010 International Centre for Policy Studies
Yes, most Mexican oil and gas deposits are located in the Gulf of Mexico.
No. Shale is not fuel in and of itself. However, some shale deposits have oil or natural gas trapped in pore spaces. This can be processed into fuel.
North Sea