Title

Basalt-CO2-brine wettability at storage conditions in basaltic formations

Document Type

Journal Article

Publication Title

International Journal of Greenhouse Gas Control

ISSN

17505836

Volume

102

Publisher

Elsevier

School

School of Engineering

RAS ID

32316

Comments

Iglauer, S., Al-Yaseri, A. Z., & Wolff-Boenisch, D. (2020). Basalt-CO2-brine wettability at storage conditions in basaltic formations. International Journal of Greenhouse Gas Control, 102, article 103148. https://doi.org/10.1016/j.ijggc.2020.103148

Abstract

© 2020 Elsevier Ltd CO2 geo-storage in basaltic formations has recently been demonstrated as a viable solution to rapidly sequester and mineralize CO2. In case CO2 is injected into such basalt reservoirs in supercritical form, a two-phase system (reservoir brine and supercritical CO2) is created, and it is of key importance to specify the associated CO2-basalt wettability so that fluid distributions and CO2 flow through the reservoir can be predicted. However, there is a serious lack of data for basalt CO2-wettability. We therefore measured water contact angles on basalt substrates in CO2 atmosphere. The results indicate that at shallow depth (below 500 m) basalt is strongly water-wet. With increasing depth the basalt becomes less hydrophilic, and turns intermediate-wet at a depth of 900 m. We conclude that basalt is more CO2-wet than chemically clean minerals (quartz, calcite), especially at depths below 900 m. However, the basalt had a CO2-wettability similar to some caprock samples and a gas-reservoir sandstone. The data presented in this paper will thus aid in the prediction and optimization of CO2 geo-storage in basalt formations.

DOI

10.1016/j.ijggc.2020.103148

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