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PROCESS-BASED APPROACH FOR THE DETECTION OF DEEP GAS INVADING THE SURFACE

United States Patent Application

20150004708
A1
View the Complete Application 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)
14/ 318,087
June 27, 2014
STATEMENT OF FEDERALLY FUNDED RESEARCH [0002] 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.