Patent ID: 6694263
Filing Date: 2004-02-17
Classification: G01V

Abstract:
A method for detecting physical changes over a course of time in a subsoil zone, by analysis of changes observable on seismic events including seismic attributes, recorded within a time window, on seismic traces of data sets obtained respectively during successive seismic surveys, by using a pattern recognition technique to classify the seismic events, with formation of a learning base with classes and construction of a classification function for the seismic events, comprising:forming an analysis set comprising all seismic events recorded on traces of the seismic traces of the data sets obtained, during successive seismic surveys, with an identification of each event by means of a spatial position in the zone and by a number of a trace set to which the event belongs; forming a learning base comprising learning classes each including seismic events detected from all successive seismic surveys, that can be associated with common physical properties; constructing a calibrated classification function of the learning classes; and applying to all seismic events detected from all the successive seismic surveys a calibrated classification function which assigns at least part of the seismic events of the set to the learning classes.