Wave separation procedure for borehole seismics with walk away acquisitions

Welletrennungverfahren für Borlochseismischen Wellen für Datenerfassung mit zunemenden Versatz

Procédé de séparation d'ondes en sismique de puits pour des acquisitions de type à déport croissant

Abstract

Method for separating waves propagating in a medium comprises comparing the first collections of signals (C) to estimated signals. A slope (p) is then applied to each point on a pivot trace at depth (z) and the amplitudes of the trace at each point are added. A synthetic seismograph is generated from the slopes and compared to the real one until, by iteration, an acceptable model is produced Method for separating waves propagating in a medium comprises generating waves in the medium successively from several positions from at least one emitter on the surface of the medium, and receiving the waves on at least one receiver which can occupy at least two positions successively in a shaft drilled in the medium. Each receiver contains three data capture units oriented along three axes (V, H1, H2). One of these axes (V) is along a set direction, each unit produces a signal which is recorded as a function of time in the form of a trace which is identified by the positions of the emitter/receiver pairing producing that trace; making collections of traces from a common emitter from at least one set of traces V, H1, H2. An angular polarization SIMILAR z, angular azimuth SIMILAR g, angle of deviation SIMILAR u and azimuth SIMILAR h are calculated for each emitter/receiver pair in the time/slope domain.
Elle est du type consistant à générer des ondes dans un milieu à partir de plusieurs positions d'un émetteur, à recevoir lesdites ondes sur au moins trois capteurs selon des axes V, H 1 , H 2 , à constituer des collections de traces C à émetteur commun et elle est caractérisée en ce qu'on réalise, à partir de la collection de traces C, des collections de traces C résiduelles et C signal, on sélectionne dans la collection de traces C résiduelles une trace pivot (10), on fait passer une droite (11) de pente p variable en chaque point échantillonné de la trace pivot, on somme le long de ladite droite (Il) les amplitudes des événements sismiques situés aux intersections des traces avec ladite droite, on reporte les sommes amplitudes dans un domaine (τ, p), on réalise un sismogramme synthétique à partir du domaine (τ, p) et on procède à des itérations jusqu'à ce que le sismogramme synthétique soit acceptable par rapport aux données de la collection des traces C résiduelles.

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