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oa Thermo-Chemo-Mechanical Models to Evaluate the Seismic Properties of Water-rock-CO2 Reactions for Carbon Sequestration in Fractured Reservoirs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Third EAGE Conference on Carbon Capture and Storage Potential, Aug 2024, Volume 2024, p.1 - 3
Abstract
A typical reservoir for carbon capture and sequestration (CCS) consists of porous hydrous basalt formations with stiff and soft pores (cracks). Fe-and Ca-rich basalt formations are the most promising mafic reservoir where the dominant storage mechanism involves solubility and mineralization through water-rock-CO₂ reactions. Insights into the elasticity, porosity, and permeability of water-rock-CO₂ reactions have great potential for seismic monitoring in carbon sequestration, which remains largely unaddressed in the literature. Cements (carbonate nodules), growing around the edges of cracks/fractures, frequently block up fluid-flow pathways, significantly affecting permeability and consolidation. Based on double-porosity thermoelastic theory, we propose a thermo-chemo-mechanical model for water-rock-CO₂ reactions to estimate the carbon storage capacity of fractured reservoirs. Considering the permeability of soft cracks is affected by the radius of carbonate nodules, we estimate the P-wave velocity and the carbon amount sequestered after CO₂ injection.
