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Formation of methane hydrate in Bentheim sandstone was monitored in situ with magnetic resonance imaging (MRI). Sequestration of CO 2 in hydrate accumulations was achieved by exposing the hydrate to liquid CO 2 . The spontaneous exchange of methane with CO 2 within the hydrate structure was monitored by MRI. The process of CO 2 –CH 4 exchange in hydrates without...