Exploring Carbonate Rock Dissolution Dynamics and the Influence of RockMineralogy in CO2 Injection

Javad Shokri, Matthias Ruf, Dongwon Lee, Saleh Mohammadrezaei, Holger Steeb, Vahid Niasar

Research output: Contribution to journalArticlepeer-review

Abstract

Understanding geochemical dissolution in porous materials is crucial, especially in
applications like geological CO2 storage. Accurate estimation of reaction rates enhances predictive modeling in geochemical-flow simulations. Fractured porous media, with distinct transport timescales in fractures and the matrix, raise questions about fracture matrix interface dissolution rates compared to bulk dissolution rate and the scale dependency of reaction rate averaging. Our investigation delves into these factors, studying the impact of flow rate and mineralogy on interface dissolution patterns. By injecting carbonated water into carbonate rock samples containing a central channel (mimicking fracture hydrodynamics), our study utilized µCT X-ray imaging at 3.3µm spatial resolution to estimate the reaction rate and capture change of pore morphology. Results revealed dissolution rates significantly lower (up to 4 orders of magnitude) than batch experiments. Flow rate notably influenced fracture profiles, causing uneven enlargement at low rates and uniform widening at higher ones. Ankerite presence led to a dissolution-altered layer on the fracture surface, showing high permeability and porosity without greatly affecting the dissolution rate, unlike clay-rich carbonates. This research sheds light on controlling factors influencing dissolution in subsurface environments, critical for accurate modeling in diverse applications.
Original languageEnglish
Article number2728
JournalEnvironmental Science & Technology
Volume58
Issue number6
DOIs
Publication statusPublished - 17 Jan 2024

Keywords

  • Reaction upscaling
  • Carbon storage
  • Fractured carbonate reservoir
  • dissolution-altered layer
  • micro-CT experiment

Fingerprint

Dive into the research topics of 'Exploring Carbonate Rock Dissolution Dynamics and the Influence of RockMineralogy in CO2 Injection'. Together they form a unique fingerprint.

Cite this