Abstract: Using core refreezing technology to refreeze unconsolidated core from watered out area and heavy oil area can make core shape, prevent volatilization loss of fluid in core, and be favourable to determine the parameters as fuid saturation and the like. But fluid expansion of core resulted from refreezing can destroy pore structure of core, make physical parameters before and after refreezing change. Based on correlation analyses, this paper discussed changing regularity of porosity, peme-ability and saturation etc, presented a correction equation of porosity and correction factor of peme-ability, put forward step correction method of saturation, providing convient conditions for oilfield to properly use physical analysis data of refrozen core.

Key words: Freezing, Core, Physical parameter, Correction