2011 11 14 Dr. Karlis Muehlenbachs at Washington, DC: Identifying the Sources of Fugitive Methane Associated with Shale Gas Development, updated January 2012 with new data

Identifying the Sources of Fugitive Methane Associated with Shale Gas Development, updated January 2012 with new data by Karlis Muehlenbachs, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada. Original presented on November 14, 2011 at Managing the risks of shale gas: Identifying a pathway toward responsible development held at Resources For the Future, Washington, DC.
More than 70% of casing gases do not come from target zone, but from intermediate layers
To identify specific sources of gas contamination in groundwater we need to mandate baseline isotopic fingerprinting of methane, ethane and propane for:
–Pre-development water wells
–Production gases
–Detailed gas isotope stratigraphy (mudgas isotope log)
–Gases from:
– conductor, surface and intermediate casings
– legacy wells if present
– natural seeps, springs and soil.
*The above requirements are not onerous.

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