Mudrocks are fine grained, low permeability sedimentary rocks. Because of these characteristics, mudrocks are difficult to characterize in terms of physical properties. The use of the reconsolidation technique allows us to determine mudrock properties while controlling mineralogy, texture, brine salinity, and stress. Cation exchange capacity (CEC) makes mudrocks water sensitive, due to double layer expansion or collapse. To characterize the CEC we have performed conductometric titration and methylene blue colorimetry. Our results are consistent with measured CEC using the cobalt hexamine technique. We examine variability in three properties, the cation exchange capacity, salinity, and silt content, and their influence on stress dependent porosity and permeability. Changing saturating brine salinity has a minimal effect on mudrock porosity but exerts a strong influence on permeability. Increasing silt content results in an increase in both porosity and permeability.
Presentation Date: Tuesday, October 18, 2016
Start Time: 10:45:00 AM
Presentation Type: ORAL