Experimental investigation of the CO2 sealing efficiency of caprocks
article
Using a combination of experimental (petrophysical and mineralogical) methods, the effects of highpressure CO2 exposure on fluid transport properties and mineralogical composition of two pelitic caprocks, a limestone and a clay-rich marl lithotype have been studied. Single and multiphase permeability tests, gas breakthrough and diffusion experiments were conducted under in situ p/T conditions on cylindrical plugs (28.5 mm diameter, 10–20 mm thickness).
The capillary CO2 sealing efficiency of the initially water-saturated sample plugs was found to decrease in repetitive gas breakthrough experiments on the same sample from 0.74 to 0.41 MPa for the limestone and from 0.64 to 0.43 MPa for the marl. Helium breakthrough experiments before and after the CO2 tests showed a decrease in capillary threshold (snap-off) pressure from 1.81 to 0.62 MPa for the limestone
The capillary CO2 sealing efficiency of the initially water-saturated sample plugs was found to decrease in repetitive gas breakthrough experiments on the same sample from 0.74 to 0.41 MPa for the limestone and from 0.64 to 0.43 MPa for the marl. Helium breakthrough experiments before and after the CO2 tests showed a decrease in capillary threshold (snap-off) pressure from 1.81 to 0.62 MPa for the limestone
TNO Identifier
446731
Source
International Journal of Greenhouse Gas Control(4), pp. 231-241.
Pages
231-241
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