Hydrate equilibria experiments were conducted in Adriatic sandstone of average pore radius 550 A. The hydrate equilibria in these experiments were indistinguishable from bulk hydrate equilibria data. A sensitivity calculation of methane hydrate equilibrium shifts in porous media was conducted using the Kelvin-Clapeyron equation. The calculation indicates that no shift is discernible from equilibria in pores larger than about 600 A with thermocouple error of +/- 0.5 K. The interfacial energy used in the sensitivity calculations is that between water and hydrate. Nucleation phenomena can be applied to explain the appropriateness of this interfacial energy with the Kelvin-Clapeyron equation. (c) 2004 Elsevier B.V. All rights reserved.