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Methane
Methane is a chemical compound with the formula CH4, produced by anaerobic bacteria, which are some of the earliest life forms that exist. Two of the primary sources of methane are produced by bacteria in the gut of ruminant quadrupeds and in areas with decaying organic matter. Methane is the primary component of natural gas.
Other Fossil Fuels
Natural gas is the simplest form of fossil fuel, generated spontaneously by decaying organic material in an oxygen-starved environment. Unlike with thermogenic gas, coal and petroleum, great heat and pressure aren't necessary to form natural gas deposits. In fact, it is hypothesized that petroleum is formed by surface natural gas co-mingling with other organic compounds under hundreds of thousands of years of heat and pressure.
Thermogenesis and Biogenesis
Thermogenic gas is hydrocarbon gas that seeps through sedimentary rock, which is porous, reacting to the higher gravity under the Earth's crust, which changes the character of the gas, increasing the purity of the gas to almost 99 percent liquid methane. Higher heat is required to make thermogenic natural gas than petroleum. This is always more valuable than biogenic gas, which is exclusively produced by anaerobic bacteria breaking down organic matter near the Earth's surface.
Length of Time
Thermogenic natural gas represents the refinement of a naturally occuring hydrocarbons, filtered to the purity of aquifer water, which is hermetically sealed from exposure to contamination. This can take hundreds of thousands to millions of years to form and many of these deposits were discovered within the last hundred years because of the advanced mining technology needed to extract resources from deep wells. Biogenic natural gas can be produced in as little as a year, and an even shorter period when induced by chemistry in biogas generation facilities.