CCS and Power Systems
Carbon Storage - Monitoring, Verification, Accounting, and Assessment
Monitoring of Geological CO2 Sequestration Using Isotopes and PF Tracers
Project No: FWP-FEAA045
Based upon the work described at the previously described projects, ORNL has conducted field studies that utilize isotopes and perfluorocarbon tracers (PFT) to monitor CO2 and reservoir conditions and obtain baseline data on the chemistry (including isotopes) of fluids and gases prior to injection at the Southeast Regional Carbon Sequestration Partnership (SECARB) Cranfield Site. Small quantities of tracer will be combined with the CO2 stream and be used to detect both the breakthrough and transport of the plume as well as the stable isotopes of carbon, oxygen, and hydrogen in CO2 and fluids sampled from monitoring wells. Isotope analyses will also be obtained on carbonates in rock samples recovered from key well sites. These data form the foundation upon which quantitative evaluation of the hydrodynamic nature of the formation and the extent to which the CO2 interacts with both the brine and host rock can be performed. This information will be (1) integrated into a monitoring, verification, and accounting system model with other data derived from geophysical and hydrological tests, and (2) compared with results from the Frio Brine Pilot test. These data, in turn, will provide guidance to regulators and other stakeholders through the development of protocols for standardizing the use of isotopes and PFT as monitoring tools for future CO2 storage operators.