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Departments & Programs


SCCS Fall Seminar - Julia S. Reece

Date(s):November 07, 2013
Time:4:15 PM
Location: Green Earth Sciences Room 365

Contact: Anshul Agarwal

Matrix Permeability and the Effect of Adsorption: An Example of the Eagle Ford Shale

We measured matrix permeability on a vertically and horizontally
oriented sample of the Eagle Ford Shale with both an adsorbing (CO2)
and a non-adsorbing pore fluid (Helium) to investigate permeability
anisotropy and the effect of adsorption on matrix permeability in both
directions. A thorough understanding of these transport processes is
critical for defining the interactions between shale and CO2, and the potential risk of CO2
leakage from storage reservoirs. Here, we performed pulse-decay
permeability experiments, and additional Darcy flow experiments for the
case of the horizontal sample, at a temperature of 38.5°C (± 0.1°C),
confining pressures up to 6000 psi, and fluid pressures ranging from 377
to 2000 psi. Results indicate that the apparent permeability using
Helium is around 10 nD in the direction perpendicular to bedding and
around 1 mD parallel to
bedding. This large anisotropy is caused by flow occurring on different
scales: through pores versus along microcracks and bedding planes. We
show that using CO2 as the pore fluid reduces the vertical
permeability by an order of magnitude due to adsorption effects;
however, it does not significantly affect the horizontal permeability.