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In Situ Freeze-Capturing of Fracture Water using Cryogenic Coring

^a Earth Sciences Division, Lawrence Berkeley National Lab., Berkeley, CA 94720
^b Dep. of Material Science and Mineral Engineering, Univ. of California, Berkeley, Berkeley, CA 94720

View larger version (48K): [in a new window]   Fig. 1. Schematic of the experimental apparatus.

View larger version (196K): [in a new window]   Fig. 2. Photograph of the core extracted in Exp. 1 where the rock matrix was saturated, but the fracture was dry. Frost on the surface is caused by matrix water that was driven out while coring or condensation from the air. The core has an approximately 25-mm (1-inch) diameter.

View larger version (72K): [in a new window]   Fig. 3. Photographs of cores extracted in Exp. 2 and 3 where the rock matrix was saturated and the fracture was partially saturated. Circled regions show evidence of ice due to the fracture water freezing while coring. The cores have an approximately 25-mm (1-inch) diameter.