Advanced tracer technology for CCS monitoring

Sven Kristian Hartvig, chief technology officer, RESMAN Energy Technology explains how the company’s advanced tracer technology is being used for CCS monitoring in Abu Dhabi’s saline aquifers

The UAE has launched its first initiative to inject CO₂ into deep saline aquifers for permanent geological sequestration. This inaugural industrial-scale Carbon Capture and Storage (CCS) project involves storing captured CO₂ emissions in deep saline aquifers, leveraging a geological solution suited to the region’s unique subsurface characteristics. One of the central innovations lies in its leak-detection capabilities, integrating RESMAN’s chemical tracer technology deployed for the first time in the UAE to monitor storage integrity and swiftly pinpoint any leaks.

A comprehensive monitoring framework with Measurement, Monitoring and Verification (MMV) capabilities provides the sensitivity, diagnostic capability, and economic viability required for large-scale CCS deployment. The system is built to last—operational for 30 years post-injection, covering every phase from active storage to long-term verification, delivering real-time insights to verify caprock integrity, quantify leaks, and trace their sources.

The monitoring solution

The monitoring solution centers on RESMAN’s High Integrity Detection System (HIDS), deployed across a network of shallow soil sampling boreholes surrounding the injection site. The system’s defining technical characteristic is its 0.1 parts per trillion (ppt) tracer detection threshold for CO₂ leakage events, enabled by capillary adsorption tubes (CAT) that undergo scheduled retrieval and laboratory analysis.

Tracer monitoring delivers multi-layered verification of storage integrity through three core functions. Continuous surface soil monitoring assesses caprock integrity and simultaneously verifying integrity of legacy wells for leaks to the atmosphere. During post-injection phases, the system maintains active surveillance of stored CO2 utilising the same principles. Advanced diagnostics provide precise leakage quantification and source identification, particularly crucial for multi-injector configurations, where determining CO₂ migration origins is essential.

Shallow boreholes positioned near injection wells monitor any effects the CO₂ injection might have on the geological structure, through surface gas and tracer detection across all operational phases. Radially distributed soil monitoring arrays track potential caprock breaches, with diagnostic algorithms distinguishing between multiple potential leakage sources. The 30-year monitoring protocol spans active injection through post-operational stewardship.

Implementation involves scheduled tracer injection into the CO₂ stream with periodic CAT sample retrieval for laboratory analysis. The system's integrated architecture correlates surface measurements with downhole data, providing leak quantification and source identification capabilities that surpass conventional pressure-based monitoring methods.

The system’s 0.1 ppt tracer detection sensitivity permits early identification of containment breaches at scales previously undetectable. Economic efficiency is achieved through optimized tracer volumes that reduce material requirements without compromising monitoring fidelity. The technology’s eighteen-year track record in continuous monitoring applications demonstrates long-term reliability under field conditions. These attributes collectively ensure compliance with stringent MMV requirements for industrial-scale CCS deployments.

Project implications

This initiative establishes several important technical precedents for regional CCS development. It demonstrates the viability of saline aquifers as secure storage reservoirs while providing a practical template for long-term MMV framework implementation. The cost-efficiency of the monitoring solution addresses a key barrier to CCS scalability in the Middle East. Furthermore, the project’s thirty-year monitoring horizon sets a benchmark for stewardship accountability in geological carbon storage.

This article is based on two recently published scientific papers:
SPE-222348-MS: Chemical Tracer for Soil CCS Monitoring Application: Monitoring CO2 Storage in Saline Aquifers Using Advanced Chemical Tracer and Detection Technology
SPE222367 -MS: Falaha CCS Project - Pioneering Low Carbon Solutions with CO2 Sequestration in Deep Carbonate Saline Aquifers

RESMAN delivers proven tracer-based MMV technology for CCS projects, with over 18 years of continuous carbon storage monitoring experience. For more information, please visit www.resmanenergy.com