Water Adsorption in Geothermal Reservoir Materials Was Investigated by Transient Flow Technique Using Steam and CO2 Gas. Theoretical and Experimental Results Indicate That Water Adsorption Exists in Vapordominated Type of Reservoir, but Experiments in the Past Have Been Limited to Pure Gases. Experimental Laboratory Work Using a Crushed Geysers Rock Sample at Low Pressure Was Carried Out. Transient Pressure Exerted by Steam Pressure Inside the Sample Was Measured Against Time During a Desorption Process. It Was Found That the Partial Presence of CO2 Did Not Significantly Affect the Adsorption of Water.

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