ADSORPTION MEASUREMENTS IN DEVONIAN SHALES

Much of the natural gas in the Devonian shales in the Appalachian basi n is stored as a condensed phase, which may be in solution in organic material or adsorbed on surfaces. A laboratory apparatus and measureme nt procedures for accurate determination of the relatively small amoun ts of condensed phase typical of Devonian shale samples have been desi gned. A temperature control system was developed so that selected temp eratures can be maintained precisely. Adsorption isotherms on various shale samples have been measured, and various factors which affect gas -shale adsorption are discussed.