In this quarterly we report progress in the following areas of advanced core analysis of low permeability gas sands. a ) Surface Area Measurements b) Helium Porosimetry c ) Comparison of Permeabilities for Preserved Cores and for Cores Subjected to Drying d) Pore Space and Fractures as Related t o Diagenesis of Multiwell Sands tones e) Imbibition Behavior of Tight Sands