Method for monitoring a subsoil zone using a plurality of correlated traces, particularly during simulated fracturing operations

A device for monitoring a subsoil zone, comprising:

• a plurality of seismic receivers arranged on the surface or in the vicinity of said surface,
• a recording unit which receives the signals transmitted by the receivers and writes same in a seismic data file, and
• seismic data processing means programmed to:
• generate a set of reference seismic data,
• record seismic data characterizing a microseismic event with said receivers,
• correlate the recorded seismic data with the reference seismic data, resulting in a plurality of correlated traces,
• correlate each correlated trace associated with a given receiver with correlated traces associated with other receivers located in a vicinity of said given receiver, in order to evaluate a similarity of each correlated trace with adjacent correlated traces, and
• detect microseismic events occurring in the subsoil zone to be monitored.

Method for monitoring a fracturing operation in a well by means of a plurality of seismic receivers arranged about the well on the soil surface or near said surface, comprising the following steps:

• generating a set of reference seismic data following a perforation shot in the well,
• recording the seismic data characterizing a microseismic event with said receivers,
• correlating the recorded seismic data the reference seismic data, resulting in a plurality of correlated traces,
• comparing each correlated trace associated with a given receiver with adjacent correlated traces associated with other receivers located in a vicinity of said given receiver, in order to evaluate a similarity of each correlated trace with the adjacent correlated traces, and
• detecting the microseismic event occurring in the subsoil zone by analysing said similarity.