Carbon Cycle Science & Technology Group

Carbon Capture & Storage

Principal Investigator Jeff Fitts

Successful large-scale implementation of Carbon Capture and Sequestration (CCS) requires clear demonstrations that it is possible to accurately quantify the environmental and human health risks, and the cost, of geologic carbon dioxide (CO₂) storage. However, significant uncertainties exist due to limited knowledge of the interaction between CO₂ and geologic formations within the storage environment. These potential interactions may positively or negatively impact reservoir performance. Brookhaven researchers are developing modeling frameworks and experimental methods to identify, quantify, and manage some of the most important uncertainties.

How much do we know about the geologic and geochemical setting of prospective CO₂ storage reservoirs?

Models of prospective geologic reservoirs are, in the best cases, constructed using geostatistical methods that combine often sparse and variable datasets to predict geologic storage formation characteristics and the performance of the caprocks that must prevent the CO₂ from leaking into other subsurface resources or back into the atmosphere.  These models consider structural geology, mineralogy, permeability, porosity, eventual CO₂-brine chemistry, and fracture type and frequency. We are building on the extensive databases developed by the DOE Regional Carbon Sequestration Partnerships, state geological surveys (e.g., Ohio State Survey) and university geologic repositories (e.g., Western Michigan University Geological Repository) to develop methods to quantify uncertainties and heterogeneities of reservoir formations, performance criteria and pore-water geochemistry that ultimately define how well we understand these critical processes. The databases and model results will also provide boundary conditions for the experimental research described below. (Figure: CCS Project Schematic; Source: Alberta Geological Survey)

How will geochemistry impact reservoir capacity and long-term CO₂ retention?

Current models used to predict CO₂ behavior in reservoirs only consider the hydrodynamics and physical characteristics of the geologic formations, and assume that geochemistry will not impact reservoir performance. We are developing experimental tools and methodologies to identify the conditions under which CO₂-saturated brines will impact flow within migration pathways by reacting with reservoir formations, caprocks, and well cements. In order to study the origin of any flowpath changes, synchrotron-based microprobe and diffraction tomographic imaging methods are being developed at Brookhaven’s National Synchrotron Light Source (NSLS) beamline X27A. These capabilities are being used to study pore-scale precipitation and corrosion processes in core samples under pressure and temperature conditions that mimic geologic storage reservoirs. The 3-dimensional in-situ imaging capabilities will benefit greatly from improved spatial resolution and sensitivity upon completion of the NSLS II. (Figure: X-ray diffraction microtomography at beamline X27A)

How accurately can we predict the environmental and human health risks, and the cost of geologic CO₂ storage?

Accurate risk assessments and costing models of site-specific geologic storage projects and regional capacity assessments require the development of a decision-making framework that integrates the latest scientific understanding of pore-scale flowpath geochemistry. Major collaborative efforts are required to tackle scaling issues and achieve this level of integration. We have teamed up with Princeton University and the University of Minnesota to develop an integrated decision making framework (see DOE Office of Fossil Energy NETL project factsheet).

Last Modified: April 27, 2012
Please forward all questions about this site to: Alistair Rogers

One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by the Research Foundation for the State University of New York on behalf of Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

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