Title: Permeability Hysteresis From Microchannels Opening During Dissolution/Reprecipitation Cycle

Abstract

Abstract Permeability is a critical parameter for geological resources characterization. Its evolution with respect to porosity is particularly interesting and many research initiatives focus on deriving such relationships, to understand some hydraulic impacts of microstructure alteration. Permeability evolution from chemical reactions, for instance, can become complex as flow channels may open during rock dissolution. In this contribution, we show that this phenomenon can lead to irregular porosity‐permeability curves and permeability hysteresis after reprecipitation. Current approaches describing permeability as a simple function of porosity can therefore not capture this behavior, and we advocate instead the use of dynamic modeling for such scenarios. We demonstrate our approach by modeling a dissolution/precipitation cycle for a unit cell pore channel and quantify the process at larger scale on three different rock samples, whose microstructures are reconstructed from segmented micro‐Computerised Tomography scans.

Authors:

Lesueur, Martin  ^[1];

• Search DOE PAGES for author "Lesueur, Martin"
• Search DOE PAGES for ORCID "0000-0001-9535-2268"

Poulet, Thomas  ^[2];

• Search DOE PAGES for author "Poulet, Thomas"
• Search DOE PAGES for ORCID "0000-0001-7351-3083"

Veveakis, Manolis ^[3]

---

+ Show Author Affiliations

1. Civil and Environmental Engineering Duke University Durham NC USA, Energy Geosciences Division Lawrence Berkeley National Laboratory Berkeley CA USA
2. CSIRO Mineral Resources Kensington WA Australia
3. Civil and Environmental Engineering Duke University Durham NC USA

Publication Date:

Thu Sep 10 00:00:00 EDT 2020

Sponsoring Org.:

USDOE

OSTI Identifier:

1664616

Grant/Contract Number:  

DE‐NE0008746‐ DoE

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Geophysical Research Letters

Additional Journal Information:

Journal Name: Geophysical Research Letters Journal Volume: 47 Journal Issue: 18; Journal ID: ISSN 0094-8276

Publisher:

American Geophysical Union (AGU)

Country of Publication:

United States

Language:

English