45+ How Coal Oil And Natural Gas Are Formed US. Like oil, natural gas is a product of decomposed organic matter, typically from ancient marine microorganisms, deposited over the past 550 million years. Other oil and natural gas deposits migrated until they were caught under impermeable layers of rock or clay.
Natural gas is formed over thousands of years as decaying plants and animals are trapped under layers of rock.
It is found on top of oil reservoirs. Sediment accumulation (needed to form coal, oil and gas) is a slow process and is the reason the formation of gas and oil takes millions of years. Deep in the earth, oil and natural gas are formed from organic matter from dead plants and animals.understand how oil and gas are formed here! And drilling of oil and gas, which often occurs together.