Exploring the connections between injection wells and seismic migration
patterns is key to understanding processes controlling growth of
fluid-injection induced seismicity. Numerous seismic clusters in
Oklahoma have been associated with wastewater disposal operations,
providing a unique opportunity to investigate migration directions of
each cluster with respect to the injection-well locations. We introduce
new directivity migration parameters to identify and quantify lateral
migration toward or away from the injection wells. We take into account
cumulative volume and injection rate from multiple injection wells. Our
results suggest a relationship between migration patterns and the
cluster-well distances, and unclear relationship with injected volume
and equivalent magnitudes. Migration away from injection wells is found
for distances shorter than 5-13 km, while an opposite migration towards
the wells is observed for larger distances, suggesting an increasing
influence of poroelastic stress changes. This finding is more stable
when considering cumulative injected volume instead of injection rate.