Characterization of Shale Cap-Rock Nano-Pores in Geologic CO2 Containment

Abstract

Research Article| November 01, 2014 Characterization of Shale Cap-Rock Nano-Pores in Geologic CO2 Containment ABIOLA OLABODE; ABIOLA OLABODE 1 Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, 2129/2131 Patrick F. Taylor Hall, Baton Rouge, LA 70803 1Corresponding author email: aolabo2@lsu.edu. Tel.: 225-921-8309. Search for other works by this author on: GSW Google Scholar MILEVA RADONJIC MILEVA RADONJIC Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, 2129/2131 Patrick F. Taylor Hall, Baton Rouge, LA 70803 Search for other works by this author on: GSW Google Scholar Environmental & Engineering Geoscience (2014) 20 (4): 361–370. https://doi.org/10.2113/gseegeosci.20.4.361 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ABIOLA OLABODE, MILEVA RADONJIC; Characterization of Shale Cap-Rock Nano-Pores in Geologic CO2 Containment. Environmental & Engineering Geoscience 2014;; 20 (4): 361–370. doi: https://doi.org/10.2113/gseegeosci.20.4.361 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Clay-rich cap rocks such as shale should be investigated experimentally for their geomechanical and geochemical behavior when in contact with aqueous CO2 over a long period of time, as can be observed in geologic carbon sequestration. The reactivity of shale cap rock during diffusive transport of CO2-brine needs to be included in the reservoir characterization of potential CO2 sequestration sites because slow reactive transport processes can either strengthen or degrade seal integrity in the long term. This experimental work applied inductively coupled plasma–optical emission spectroscopy (ICP-OES) and the Brunauer-Emmett-Teller (BET) techniques in investigating changes in surface and near-surface properties of crushed shale rocks after exposure (by flooding) to CO2-brine for a time frame ranging from 30 days to 90 days at elevated pressure and fractional flow rate. Flooding of the shale samples with CO2-brine was followed by measurement of changes in internal specific surface area and linear pore-size distribution resulting from aqueous CO2 reactive transport. The intrinsically low hydraulic conductivity of shale may be altered by changes in surface properties because the effective permeability of any porous medium is largely a function of its global specific pore geometry and surface mineralogical properties. Capillary entry pressure for the shale, as well as the average pore throat size were estimated from digitally acquired pressure evolution data. This allowed for the estimation of dimensionless quantities such as Peclet (Pe) and Peclet-Damköhler (PeDa) numbers, which are associated with the geochemical reactivity of rocks and acidic fluid transport through porous media. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.