Interferometric Microseism Localization for Multistage Fracture Monitoring

We show how interferometric methods can be used to improve the location of microseismic events when those events come from several different fractures and are observed from a single well. This is the standard setup for a multi-stage hydraulic fracturing<br>experiment. Traditionally, in such experiments each event is located separately. Here, we adapt the interferometric approach to the problem of locating events relative to one another and show that this reduces the uncertainty in location estimates. To<br>completely recover the Green’s function between two events with interferometry requires a 2D array of receivers. When only a single observation well is available, we do not attempt to recover the full Green’s function, but instead perform a partial redatuming of<br>the data allowing us to reduce the uncertainty in two of the three components of the event location.