Exploring the sequestration efficiency of coals using neutron scattering: the effect of exposure to sub-and supercritical CO2 on the porous coal matrix

Status Start Date End Date Locations
completed Dec 6, 2007 Sep 30, 2010 All Counties
Director: Maria Mastalerz
Other Researchers:
Issue: Behaviour of CO2 in rock environment at reservoir temperature and pressure conditions is not very well understood. Yet it is a very important issues for CO2 storage in geological formations such as coal, shales, or saline aquifers. Foe example, in order to make better predictions of CO2 injectivity, mechanisms of CO2 storage in rock formations need to better known
Objective: Two main objectives of this project are: 1) investigating CO2 adsorption mechanisms in coals and organic matter rich shales; and 2) documenting changes in the rock as a result of CO2 injection at reservoir conditions
Approach: Small angle neutron scattering (SANS) technique is being applied to investigate CO2 behavior in rock environment. A high pressure reactor at Oak Ridge National Lab is used for these experiments. A senior scientist for that lab, Yuri Melnichenko, is our collaborator
Products: It is a research project that have resulted in new data and new interpretations of CO2 behaviour in the rock environment. Main products are our publications. So far, we have published two papers in international journals, and more manuscripts are in preparation. We have also presented results at national (e.g., GSA, Goldschmidt Conference) and international meetings. Publications: 1) Radlinski, A., Busbridge, T.L., Blach, T.P., Gray, E. MacA., Chen, G., Melnichenko, Y.B., Cookson, D.J., Mastalerz, M., Esterle, J., 2009. Dynamic micro-mapping of CO2 sorption in coal. Langmuir 25, 2385-2389. 2) Melnichenko, Y.B., Radlinski, A.P., Mastalerz, M., Cheng, G., Rupp, J., 2009. Characterization of the CO2 fluid adsorption in coal as a function of pressure using neutron scattering techniques (SANS and USANS). International Journal of Coal Geology 77, 69-77. http://dx.doi.org/10.1016/j.coal.2008.09.017
Benefits: The results of our study help understand some phenomena of injectivity encountered in the filed tests. This, in turn, may help to better predict CO2 injection processes in various geologic formation.