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@article{Al-menhali:2016:10.1021/acs.est.6b03111,
author = {Al-menhali, A and Menke, H and Blunt, MJ and Krevor, SC},
doi = {10.1021/acs.est.6b03111},
journal = {Environmental Science & Technology},
pages = {10282--10290},
title = {Pore Scale Observations of Trapped CO2 in Mixed-Wet Carbonate Rock: Applications to Storage in Oil Fields},
url = {http://dx.doi.org/10.1021/acs.est.6b03111},
volume = {50},
year = {2016}
}
TY - JOUR
AB - Geologic CO2 storage has been identified as a key to avoiding dangerous climate change. Storage in oil reservoirs dominates the portfolio of existing projects due to favorable economics. However, in an earlier related work (Al-Menhali and Krevor Environ. Sci. Technol. 2016, 50, 2727−2734), it was identified that an important trapping mechanism, residual trapping, is weakened in rocks with a mixed wetting state typical of oil reservoirs. We investigated the physical basis of this weakened trapping using pore scale observations of supercritical CO2 in mixed-wet carbonates. The wetting alteration induced by oil provided CO2-wet surfaces that served as conduits to flow. In situ measurements of contact angles showed that CO2 varied from nonwetting to wetting throughout the pore space, with contact angles ranging 25° < θ < 127°; in contrast, an inert gas, N2, was nonwetting with a smaller range of contact angle 24° < θ < 68°. Observations of trapped ganglia morphology showed that this wettability allowed CO2 to create large, connected, ganglia by inhabiting small pores in mixed-wet rocks. The connected ganglia persisted after three pore volumes of brine injection, facilitating the desaturation that leads to decreased trapping relative to water-wet systems.
AU - Al-menhali,A
AU - Menke,H
AU - Blunt,MJ
AU - Krevor,SC
DO - 10.1021/acs.est.6b03111
EP - 10290
PY - 2016///
SN - 0013-936X
SP - 10282
TI - Pore Scale Observations of Trapped CO2 in Mixed-Wet Carbonate Rock: Applications to Storage in Oil Fields
T2 - Environmental Science & Technology
UR - http://dx.doi.org/10.1021/acs.est.6b03111
UR - http://hdl.handle.net/10044/1/39318
VL - 50
ER -
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