why Methane occupy spaces in well
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Gases (not dissolved in water) can migrate into wells that are not properly cased. Gas can also be naturally present in the water in an aquifer. For example, the Ardley coal zone is present in the Scollard Formation, which is the major aquifer in central Alberta. A water well completed in the Scollard Formation can yield gas if the gas-bearing zone is not cased and sealed off. Well drillers are required to report and seal off gas that could be dangerous to the drilling operation or operation of the well.