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Appendix K: Paradox Valley Unit Saltwater Injection Project
Pages 239-242

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From page 239...
... The possibility of induced seismicity was addressed during the planning stages of the PVU injection program because the Paradox Valley Unit injection program was comparable to both the injection programs at the Rocky Mountain Arsenal northeast of Denver and the water injection program for improved oil recovery at Rangely, Colorado. Eight years before injection was begun at the PVU site, the Bureau of Reclamation commissioned a seismic monitoring network to measure the seismic activity in the Paradox Valley region.
From page 240...
... The Bureau of Reclamation continues to inject saline fluids underground as part of the Colorado River Basin Salinity Control Project, and it continues to control induced seismicity by the biennial shutdown of injection activity and by limiting the volume of fluid injected. Both of these actions minimize downhole injection pressure in an effort to limit induced seismic events.
From page 241...
... 450 400 350 300 250 200 150 100 50 0 Jan-91 Jan-93 Jan-95 Jan-97 Jan-99 Jan-01 Jan-03 Jan-05 Jan-07 Jan-09 Jan-11 Induced Seismicity 18 16 14 Northern valley Distance from Well (km) 12 10 8 NW & SE clusters 6 4 Near-well 2 0 Jan-91 Jan-93 Jan-95 Jan-97 Jan-99 Jan-01 Jan-03 Jan-05 Jan-07 Jan-09 Jan-11 all induced events events with M >= 2.5 and < 3.0 events with M >= 3.0 and < 3.5 events with M >= 3.5 FIGURE K.1  Twenty-year data set collected by the Bureau of Reclamation for the Paradox Valley project.
From page 242...
... Presentation to the National Research Council Committee on Induced Seismicity Potential in Energy Technologies, Dallas, TX, September 14. Bureau of Reclamation.

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