Process-based approach for the detection of deep gas invading the surface
Patent
·
OSTI ID:1356235
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.
- Research Organization:
- Board of Regents, The University of Texas System, Austin, TX (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG04-90AL65847
- Assignee:
- Board of Regents, The University of Texas System
- Patent Number(s):
- 9,645,129
- Application Number:
- 14/318,087
- OSTI ID:
- 1356235
- Country of Publication:
- United States
- Language:
- English
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