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Process-based approach for the detection of deep gas invading the surface

United States Patent

May 9, 2017
View the Complete Patent at the US Patent & Trademark Office
The present invention includes a method for determining the level of deep gas in a near surface formation that includes: measuring CO.sub.2, O.sub.2, CH.sub.4, and N.sub.2 levels in percent by volume from one or more surface or near surface geological samples; adding the water vapor content to the measured CO.sub.2, O.sub.2, CH.sub.4, and N.sub.2 levels in percent by volume; normalizing the gas mixture to 100% by volume or 1 atmospheric total pressure; and determining the ratios of: O.sub.2 versus CO.sub.2 to distinguish in-situ vadose zone CO.sub.2 from exogenous deep leakage CO.sub.2; CO.sub.2 versus N.sub.2 to distinguish whether CO.sub.2 is being removed from the near surface formation or CO.sub.2 is added from an exogenous deep leakage input; or CO.sub.2 versus N.sub.2/O.sub.2 to determine the degree of oxygen influx, consumption, or both; wherein the ratios are indicative of natural in situ CO.sub.2 or CO.sub.2 from the exogenous deep leakage input.
Romanak; Katherine (Austin, TX), Bennett; Philip C. (Austin, TX)
Board of Regents, The University of Texas System (Austin, TX)
14/ 318,087
June 27, 2014
STATEMENT OF FEDERALLY FUNDED RESEARCH This invention was made with U.S. Government support by the U.S. Department of Energy through the Office of the Governor of Texas (contract DE-FG04-9OAL65847) and the National Energy Technology Laboratory (contract DE FG26-05NT42590) through the Southeast Regional Carbon Sequestration Partnership. The government has certain rights in this invention.