Improved method for migration before summation

Details Improved method for migration before summation Improved method for migration before summation

G - Physics

01

V

G01V 1/30 (2006.01) G01V 1/28 (2006.01)

Patent

CA 2240998

The invention concerns an improved method for migration before summation consisting in recording seismic reflection traces, for constituting a collection of traces to be migrated before summation and without weight correction the traces being classified according to a given criterion and using a velocity model. The invention is characterised in that it further consists in determining for each point of interest M in a domain (x, z) at least one line of slope determined on the basis of a line of slope map. in determining the specular rays associated with one point M and for said line of slope, in computing the time and amplitude characteristics of each of the specular rays for deducing therefrom the reflection factor in each point M.

Elle est du type consistant à enregistrer des traces sismiques réflexion pour constituer une collection de traces, à migrer avant sommation et sans correction de poids les traces classées, suivant un critère donnée et en utilisant un modèle de vitesses, caractérisée en ce qu'elle consiste en outre à déterminer pour chaque point M d'intérêt dans un domaine (x, z) au moins un pendage déterminé à partir d'une carte de pendage, à déterminer les rayons spéculaires associés au point M et pour ledit pendage, à calculer les caractéristiques temps et amplitude de chacun des rayons spéculaires pour en déduire la réflectivité en chaque point M.

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