HR: 15:10h
AN: H13I-07 INVITED     [Abstracts]
TI: In Situ Characterization of Porosity and Permeability Changes at High Pressure: Application to Geological Sequestration
AU: * McGrail, B P
EM: pete.mcgrail@pnl.gov
AF: Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 United States
AU: Bacon, D H
EM: diana.bacon@pnl.gov
AF: Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 United States
AU: Saripalli, P
EM: prasad.sarapalli@pnl.gov
AF: Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 United States
AU: Shaw, W J
EM: wendy.shaw@pnl.gov
AF: Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 United States
AB: The global energy system is dominated by fossil fuels, which are abundant and relatively inexpensive. Carbon dioxide emissions resulting from the use of fossil fuels are responsible for most of the projected human influence on climate. As a society, if we wish to manage the risks of climate change, finding methods and developing new technologies so that fossil fuels become net zero-carbon emitting is a critical part of an overall climate change response strategy. An important technology receiving increasing attention is capturing CO$_{2}$ from large stationary power sources and recycling the carbon back into the ground where it may be used for additional resource recovery (oil or natural gas) or simple sequestration. Successful implementation of carbon capture and sequestration requires a fundamental understanding of the chemical reactions of CO$_{2}$ within the host formation and impacts on porosity and permeability. In this paper, we will discuss the experimental challenges associated with measurements of porosity and permeability changes under high-pressure conditions and attributing observed changes to specific dissolution-precipitation reactions or dissociation-formation reactions in the case of natural gas hydrates. Application of new techniques, such as pulsed field gradient NMR and scanning laser Raman LIDAR will be described that hold promise for in-situ measurements. Measurement of gas permeability in gas hydrate-bearing sediments will also be discussed. Such data are extremely rare, principally because of the difficulties involved in stabilizing the gas hydrate under high pressure. Gas flow rate data collected over gas hydrate saturations between 10% and 70% in Accusand show poor correlation with classical models such as Brooks-Corey.
DE: 1803 Anthropogenic effects
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting