Rate Measurements And Detection Of Gas Microseepage To The Atmosphere From An Enhanced Oil Recovery-Sequestration Project, Rangely, Colorado, Usa

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Journal Article: Rate Measurements And Detection Of Gas Microseepage To The Atmosphere From An Enhanced Oil Recovery-Sequestration Project, Rangely, Colorado, Usa

Abstract
One of the proposals for large-scale sequestration of fossil fuel-derived CO2 is deep geologic disposal in depleted oil/ gas reservoirs or deep aquifers. Previously published scenarios for this inadequately proven technology have either ignored or dismissed the possibility of vertical migration of gases caused by overpressure. Overpressuring of a reservoir or aquifer will be necessary in order to have acceptable rates for dispersal of injected CO2. This research describes methodology and the results of measurement of microseepage Of CO2 and CH4 at a large-scale CO2-enhanced oil recovery (EOR) operation at Rangely, Colorado, USA. Shallow and deep soil gas concentrations, and direct transport Of CO2 and CH4 into the atmosphere were measured. The interpretation of the measurements was complemented by both stable and radiogenic isotopic measurements of C. The results have demonstrated an estimated microseepage to the atmosphere of approximately 400 metric tonnes of CH4/a from the 78 km(2) area of the Rangely field. Preliminary estimates of deep-sourced CO2 losses are <3800 tonnes/a, based on stable isotope measurements of soil gases. Several holes up to 10 m deep were drilled on, and off the field for nested gas sampling of composition and stable C isotopic ratios for CO2 and CH4. Carbon-14 measurements on CO2 from these holes indicate that deep-sourced CO2 microseepage losses were approximately 170 tonnes/a. (C) 2003 Elsevier Ltd. All rights reserved.

Author 
R. W. Klusman








Published Journal 
Applied Geochemistry, 2003





DOI 
Not Provided
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Citation

R. W. Klusman. 2003. Rate Measurements And Detection Of Gas Microseepage To The Atmosphere From An Enhanced Oil Recovery-Sequestration Project, Rangely, Colorado, Usa. Applied Geochemistry. (!) .