Abstract
Abstract This study deals with dawsonite-bearing carbonate veins in the Izumi Group, SW Japan, as a natural analogue of fracture formation in a caprock and of the migration of CO 2 -rich fluid through the fractures. The dawsonite-bearing veins studied here were formed by hydraulic fracturing, and the invasion of CO 2 -rich fluid occurred at least twice. Field analysis and isotopic study have shown that the upward migration of CO 2 -rich fluid was stopped by a good quality mudstone layer of 100-500m thickness. The possible conditions of fracturing suggest that the excess fluid pressure associated with fracture formation was too large to be attained by controlled injection.
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