The present invention is to accurately measure the amount of carbon dioxide in the coal seam methane gas reservoir. By grasping the amount of carbon dioxide, the degree of corrosion of the production well of the steel pipe material can be predicted in advance. In the present invention, there is an advantage of overcoming both the disadvantage of not being able to grasp the loss gas in the conventional direct measurement method, and the disadvantage of targeting only free gas in the pilot production method, and the amount of carbon dioxide in the coal seam can be accurately grasped. The present invention is characterized in determining the amount of carbon dioxide adsorbed in the coal seam by applying a pilot production method, a Langmeyer experiment and a modified Langmeyer function.
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