Passive source location by diffraction scanning

Jorge E. Monsegny, Donald C. Lawton, Daniel O. Trad

During CO₂ injection monitoring several events generated by passive sources at different locations are recorded. Some events are from surface operations while others are consequence of the CO₂ injection. We develop a technique that analyzes the moveout of the passive seismic events for a series of potential sources located at different positions in the subsurface. The technique generates a plot that catalogs the events by source location making possible to discern events produced the zone of interest from events generated elsewhere. We apply the technique to passive seismic records at the Containment and Monitoring Field Research Station in Alberta, Canada.