METHOD FOR DETERMINING A SEISMIC WAVE VELOCITY MODEL IN A HETEROGENEOUS UNDERGROUND FORMATION

摘要

P - method for determining a model of the speed of seismic waves picked up by the seismic receivers coupled with an underground formation, in response to the emission of seismic waves in the - ground by a seismic source after reflection on the geological interfaces of the formation, from the recordings multi - offsets of these wave. - from the point on the seismic recordings of one or more events for various pairs source - sensor associated with the offset the lowest of a seismic acquisition device, the predicted the geometry of the events considered for the entire range of offsets of the acquisition device and for different values of speed taken around a speed of the reference layer, and this by using techniques of the kinematic inversion and modeling. Then, for different lateral positions of the acquisition device, it selects the curve from time of the predicted path best approximating to the seismic event considered. The travel time is thus obtained are then supplied to a method of inverting prestack such as tomography of time of path. - applications to the seismic image in the - ground, for example. / p