Abstract
During the process of sediment mobilisation unconsolidated sediments are deformed due to fluid overpressure. Structures formed by sediment mobilisation can serve as high permeable pathways for vertical fluid migration through a low-permeable seal layer and, therefore, have to be considered in the risk assessment of CO2 storage sites. In our study, we designed and conducted physical sandbox models to investigate structural characteristics and the dynamic evolution of sediment mobilisation resulting from pore fluid overpressure. Preliminary results show that basically two different modes of cover deformation occur: uplift in cohesive sediment and pipe formation in low-cohesive sediments.
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