Method for monitoring a subsoil zone, particularly during simulated fracturing operations
AssigneeCggveritas Services SA
InventorJulien Meunier
Life of this patent
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Abstract
A method and device for monitoring a subsoil zone, wherein a plurality of receivers are arranged on a surface of the soil or near said surface, straight above a geological zone to be monitored, comprising the following steps: generating a set of reference seismic data; recording seismic data by means of said receivers; correlating the seismic data recorded with the reference seismic data; comparing each trace of the correlated data, with correlated traces located in a vicinity of said trace, in order to evaluate a similarity of each correlated trace with the adjacent correlated traces; and, detecting a microseismic event occurring in the subsoil zone by analysing said similarity. The method and device enables real-time monitoring.
Claims17
A method of monitoring a subsoil zone using a plurality of seismic receivers arranged on the surface or near said surface, comprising the following steps:
- generating a set of reference seismic data;
- recording seismic data using said receivers to provide recorded seismic data;
- correlating the recorded seismic data with the reference seismic data to provide a plurality of correlated traces;
- correlating a selected correlated trace corresponding to a selected seismic receiver of the plurality of seismic receivers with a sum of correlated traces corresponding to adjacent seismic receivers located in a vicinity of the selected seismic receiver, in order to evaluate a similarity of the selected correlated trace with the correlated traces corresponding to adjacent seismic receivers;
- and,
- detecting a microseismic event occurring in the subsoil zone by analyzing said similarity.
A 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 seismic data using said receivers;
- correlating the recorded seismic data with the reference seismic data to provide a plurality of correlation traces;
- correlating a selected correlated trace corresponding to a selected seismic receiver of the plurality of seismic receivers with a sum of correlated traces corresponding to adjacent seismic receivers located in a vicinity of the selected seismic receiver, in order to evaluate a similarity of the selected correlated trace with the correlated traces corresponding to adjacent seismic receivers;
- and,
- detecting a microseismic event occurring in the subsoil zone by analyzing said similarity.
Dependencies are inferred from the claim text.