Methods for Integrated Leak Detection Inference at CO2 Sequestration Sites

Speaker(s): 
Date: 
March 23, 2010 - 12:00pm
Location: 
90-3122

This seminar will explain a methodology for combining site characterization and soil CO2 monitoring for detecting leaks at geologic CO2 sequestration sites.  Near surface CO2 fluxes resulting from a leak are simulated using the TOUGH2 model for different values of soil permeability, leakage rate and vadose zone thickness. Natural background soil CO2 flux rates are characterized by a Bayesian hierarchical model that predicts the background flux as a function of soil temperature.  A presumptive leak is assumed if the monitored flux rate exceeds a critical value corresponding to a very high (e.g., 99%) prediction interval for the natural flux conditioned on temperature.  A probabilistic calculation then combines the probability distribution of random leak locations relative to monitoring coordinates, the predicted size of the flux relative to the leakage rate, and the probability that the total flux (natural + leakage) exceeds the critical value for detection.   The methodology is demonstrated for an idealized site employing soil surface seepage monitoring.  Extensions are discussed, including: the combination of inferences from multiple leak detection technologies (e.g., tracer gas, soil gas isotope, and groundwater chemistry monitoring); and the application to actual sites with nonhomogeneous leak probabilities and variable CO2 leak-flux response profiles.

Add event to Google Calendar

Announcement List

To be added to our seminar annoucement list please, email the ETA Seminars Team. Seminars can change witout noticed, the best way to stay informed is to join our seminar email list. 

Site Access

For site access please email your request to etaseminars@lbl.gov. To arrive at Building 90 via the LBNL shuttle, take "Blue Uphill". Click here for the shuttle schedule. To ensure your site access is set-up send your request 36 hours in advance of the seminar.

Remote Access

Not able to attend in person? Remote participants can use ReadyTalk Audio & Net conference to phone in to listen, while viewing the presentation via the ReadyTalk site.

Web Access Code: 4864835

USA & Canada call-in number:
1 (866) 740-1260
Access Code: 4864835#

International callers:
Please visit this website to see if a toll-free call-in number is available for your international location.

If not, you will need to pay for the call yourself and use this phone number:

(303) 248-0285.