Separation of converted modes in marine data

Carlos A. Cunha Filho & Francis Muir

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ABSTRACT

Two methods are tested to separate the converted modes from the dominant P wavefield. The first one uses the critical slowness for P waves as the discriminant factor and is ineffective for deep reflectors. A better result is obtained with another approach, in which the upcoming wavefield is divided into zones sharing a common range of ray parameter; a filtering process using the horizontal slowness as the discriminant factor is then applied to each zone. Although more efficient, this method is more sensitive to contamination by multiples. For this reason the suppression of multiples and peg-legs prior to the separation process becomes of vital importance.