The Global CCS Institute, an international think tank dedicated to accelerating the deployment of carbon capture and storage (CCS) technology, has released a detailed new guidance document and fact sheet outlining the strategic role of carbon dioxide-enhanced oil recovery (CO2-EOR) in the broader context of climate mitigation. The new report highlights a complex but potentially vital pathway for the energy industry, suggesting that the same processes used to boost oil production can be leveraged to permanently sequester carbon dioxide deep underground. This dual-purpose approach, according to the Institute, represents a significant bridge between current fossil fuel operations and a future dominated by dedicated carbon storage solutions.
The technical process at the heart of this guidance begins with the capture of carbon dioxide from large-scale industrial sources. This includes emissions from traditional power stations, such as coal or gas-fired plants, as well as "hard-to-abate" sectors like cement manufacturing, steel production, and chemical processing. Rather than allowing these greenhouse gases to enter the atmosphere and contribute to global warming, they are captured at the point of origin, purified, and compressed into a dense, liquid-like state. This captured CO2 is then transported via pipeline or ship to specifically selected oil fields that have the geological characteristics necessary for both oil recovery and long-term storage.
Once the CO2 reaches the designated oil field, it is injected into the reservoir through specialized injection wells. In a traditional oil field, a significant portion of the oil remains trapped in the pores of the rock even after primary and secondary recovery methods have been exhausted. When the injected CO2 enters the reservoir, it acts as a powerful solvent. It mixes with the oil, reducing its viscosity and causing it to expand. This physical change allows the oil to flow more easily through the rock toward production wells, effectively "sweeping" the reservoir and extending the productive life of the field.
However, the Global CCS Institute emphasizes that the critical distinction in this new guidance is the focus on the "storage" component of the process. While the gas facilitates the movement of oil, a significant portion of the injected CO2 remains trapped beneath the surface within the rock formations. This occurs through various mechanisms, such as being dissolved into the remaining reservoir fluids or becoming physically stuck in the microscopic pores of the stone. This natural trapping is the foundation of the carbon storage element of the project, turning an extraction process into a method for long-term sequestration.
A key operational feature highlighted in the fact sheet is the management of CO2 that returns to the surface alongside the extracted oil. In a well-managed CCS-EOR project, this "produced" CO2 is not released into the atmosphere. Instead, the facility is equipped with separation and treatment equipment that strips the gas from the oil and gas stream. Once separated, the CO2 is re-compressed and reinjected back into the reservoir in a continuous, closed-loop system. This recycling process ensures that, over the life of a project, the net amount of CO2 injected into the ground far exceeds any incidental releases, leading to a permanent increase in the volume of gas stored underground.
To ensure that this storage is indeed permanent and climate-positive, the Institute stresses the necessity of rigorous Monitoring, Reporting, and Verification (MRV) protocols. These protocols involve a suite of technologies, including seismic sensors, pressure gauges, and atmospheric monitors, used to track the movement of the CO2 plume within the reservoir and to detect any potential leaks. By quantifying the exact amount of CO2 injected and subtracting any that is lost or utilized in operations, operators can provide a verified account of the total carbon permanently sequestered. This data is essential for regulatory compliance and for projects seeking to earn carbon credits or meet corporate sustainability targets.
The Global CCS Institute is careful to distinguish this integrated approach from both conventional EOR and dedicated carbon storage. In conventional EOR, the primary and often sole objective is to maximize oil production at the lowest possible cost, with little regard for the long-term fate of the CO2 used. Conversely, dedicated storage projects, often referred to as "saline aquifer storage," involve injecting CO2 into deep formations that contain no oil or gas, with the exclusive goal of permanent sequestration. The Institute views CO2-EOR with CCS as a middle ground—a hybrid model that uses the revenue from oil production to offset the high capital costs associated with carbon capture and transportation infrastructure.
This economic reality forms the basis of the Institute’s argument that EOR combined with CCS could provide a "transitional route" toward the wider deployment of dedicated CO2 storage. The infrastructure required for EOR—such as large-scale pipeline networks and injection facilities—is largely identical to what will be needed for massive dedicated storage hubs in the future. By allowing the oil industry to lead the initial build-out of this infrastructure, the costs of carbon management can be shared, and the technology can be refined at scale. This "learning by doing" phase is seen as a critical step in de-risking CCS for other industrial sectors that may not have the same profit margins as the oil and gas industry.
However, the potential for this transitional route is not uniform and depends on a variety of site-specific factors. The guidance points out that geology is the primary constraint; not every oil field is suitable for CO2 injection, and not every rock formation is capable of securely containing the gas for thousands of years. Beyond geology, access to a steady and affordable supply of captured CO2 is essential. This requires a proximity to industrial clusters or the development of long-distance transport networks. Furthermore, the regulatory environment plays a decisive role. For these projects to succeed, there must be clear legal frameworks governing pore space ownership, long-term liability for the stored gas, and standardized rules for how carbon storage is credited against emissions.
Perhaps the most significant warning in the new guidance is that permanent storage alone does not automatically equate to a net climate benefit. The Institute stresses that a project’s overall impact on the atmosphere must be viewed through the lens of a comprehensive Life Cycle Assessment (LCA). An LCA accounts for all emissions associated with the project, including the energy used to capture and compress the CO2, the emissions generated during the drilling and extraction of the oil, and, most importantly, the downstream emissions produced when the resulting oil is eventually refined and burned by end-users.
If the amount of CO2 stored underground is less than the total emissions generated by the project’s operations and the combustion of the produced oil, the project may still result in a net increase in atmospheric greenhouse gases. Because of this complexity, the Global CCS Institute is calling for the establishment of consistent boundaries and common accounting rules. Without a unified global standard for assessing the climate impact of individual CCS-EOR projects, it becomes difficult for investors, regulators, and the public to distinguish between genuine decarbonization efforts and projects that merely use carbon storage as a tool for continued fossil fuel expansion.
The release of this guidance comes at a time of rapid expansion for the CCS industry. Governments around the world are increasingly looking to carbon capture as a necessary tool for reaching net-zero targets, particularly for industries like steel and cement where no easy electrical alternatives exist. As the number of planned CCS projects grows, the integration of EOR is becoming a central point of debate. Proponents argue it is a pragmatic way to fund the necessary infrastructure, while critics worry it could prolong the world’s reliance on hydrocarbons.
The Institute’s fact sheet seeks to navigate this debate by providing a technical and transparent framework for how these projects should be evaluated. By emphasizing the importance of MRV and LCA, the guidance moves the conversation toward a more data-driven approach. The goal is to ensure that if EOR is to be used as a vehicle for CCS, it must be done with a level of oversight and accounting that guarantees a legitimate contribution to global climate goals.
As industrial emissions continue to be a primary driver of climate change, the development of carbon capture technology remains a high priority for international energy agencies. The Global CCS Institute’s new guidance serves as a reminder that while the technology exists to store carbon permanently, the success of these initiatives will ultimately depend on the rigor of the rules that govern them. The focus now shifts to how regulators and industry leaders will implement these recommendations to ensure that "transitional" projects truly lead toward a lower-carbon future.
The guidance concludes by reiterating that while CO2-EOR with CCS is a valuable tool in the current energy landscape, it is not a final destination. The ultimate goal remains the transition to dedicated, large-scale storage projects that can handle the billions of tons of CO2 required to stabilize the global climate. In the meantime, the Institute suggests that the lessons learned from the oil field will be instrumental in building the carbon management industry of the future. By refining the processes of capture, transport, and injection today, the global community can better prepare for the massive scaling of dedicated storage that will be required in the decades to come.
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