Patent ID: 6075752
Filing Date: 2000-06-13
Classification: G01V

Abstract:
A method for the exploration of a medium with a complex tectonics by seismic reflection to obtain parameters characterizing at least the stacking velocity field associated with reflector elements situated at the vertical to a given point (A) of the surface of the environment (S), said method comprising building a common midpoint gather (CMP) of seismic traces of which the CMP point is said given point, subjecting the traces of this gather to dynamic or static corrections or both, building the gather associated with the given point (A) by recording four CMP sub-gathers associated with said given point along four angular directions (1 to 4) passing through said given point, and applying dynamic or status corrections or both to each of the four CMP sub-gathers in order to determine, for each sub-gather, a value of the curvature or the velocity or both optimizing the energy of the trace stack of the corrected sub-gather concerned, the four values thus obtained representing the components of the stacking velocity field desired for each of the reflector elements corresponding to the given point, and characterized by a vertical propagation time to with reflection for zero offset.