From gas to stone: In-situ carbon mineralisation as a permanent CO2 removal solution

Carbon mineralisation in underground mafic and ultramafic formations, known as in-situ carbon mineralisation, has emerged as an attractive technology for permanent CO₂ storage. Despite its potential, this method has received limited attention compared to conventional CO₂ storage in sedimentary formations. However, increasing interest from countries and companies in utilising this approach to permanently store CO₂ via carbon mineralisation has grown in recent years as part of the wider carbon capture and storage expansion seen globally.

This review paper aims to provide an in-depth overview of in-situ carbon mineralisation technology. The paper covers key factors crucial for successful implementation, including water consumption, CO₂ injection rate, risk of CO₂ leakage, injectivity, fracture characterisation, pressure management and induced seismicity, thermal effects, surface area of minerals, groundwater contamination, injection strategy, monitoring of confinement, and reservoir modelling. The paper also discusses pilot tests and projects, highlighting their outcomes. Furthermore, it discusses the costs associated with in-situ carbon mineralisation and provides a case study.

The primary objective of this paper is to increase awareness and understanding of this relatively new technology within the carbon capture and storage industry. By shedding light on the benefits and challenges of carbon mineralisation in mafic and ultramafic formations, this review aims to encourage further research, development, and adoption of this promising approach for CO₂ emissions reduction and permanent CO₂ storage.