Fluid Injection Wells Can Have a Wide Seismic Reach

This valve assembly is the aboveground portion of an injection well, which can be used to dispose of fluid deep in the subsurface. Recent studies show that the cumulative effects from injection in numerous disposal wells can contribute to seismic activity far from the injection sites. Credit: Leonid Eremeychuk/iStock/Getty Images Plus/Getty Images

High-volume fluid injection can cumulatively increase underground pore pressure and induce earthquakes in regions unexpectedly far from injection wells, recent Kansas studies show.

eos.org - by Shelby L. Peterie, Richard D. Miller, Rex Buchanan, and Brandy DeArmond - April 17, 2018

Seismologists largely attribute widespread earthquakes in southern Kansas and northern Oklahoma over the past several years to injection of extracted oil field brine deep into Earth’s crust. Recently, however, the frequency of earthquakes has increased significantly in areas of Kansas well beyond the initial high-seismicity zones near injection wells.

Because the vast majority of high-volume injection wells in the region are near and south of its border with Oklahoma, Kansas has a unique vantage point for observing far-field effects of injection.

(READ COMPLETE ARTICLE)