Methods and systems for seismic monitoring

Abstract

A system for determining a depth z to install a borehole receiver in a monitoring borehole includes a seismic source, a seismic receiver, an antenna, a computing device and a drilling system. The seismic source generates surface waves having multiple frequencies in a frequency band of interest within a geologic formation such as a subterranean reservoir. The seismic receiver is placed at a distance d from the seismic source, to receive the surface waves. The computing device determines a smallest frequency f1 of the multiple frequencies. The computing device further determines a surface wave velocity v for the smallest frequency f1. The computing device further calculates a longest wavelength WL of the surface wave in the frequency band of interest based on WL=v/f1. The borehole receiver is installed, e.g., with the drilling system, in the monitoring borehole at the depth z equal to the longest wavelength WL.