A Practical Approach to Vector-acoustic Imaging of Primaries and Free-surface Multiples

Matteo Ravasi, Ivan Vasconcelos, Andrew Curtis, A Kritski

Research output: Contribution to conferencePaperpeer-review

Abstract

Free-surface multiples travel different paths and illuminate different volumes of the subsurface than primaries. When used jointly with primaries to image the subsurface by means of forward and backward extrapolation of separated down- and up-going wave components respectively, free-surface multiples have
been shown to improve the continuity of shallow parts of the subsurface image by suppressing acquisition related footprints.

We show that by carefully combining the full pressure and particle velocity data by means of newly developed, vector-acoustic boundary conditions, wavefronts can be forward and backward propagated without ambiguity in their propagation direction. Wavefield decomposition is thus naturally incorporated within the extrapolation procedure.

Moreover, ocean-bottom acquisition geometries generally present source coverage that is wider than the receiver array. A strategy is proposed to incorporate in our imaging scheme energy of primary events whose direct source illumination lies outside of the receiver aperture. This is achieved by combining a directly modelled source illumination with the recorded (down-going) data.
Original languageEnglish
Publication statusPublished - 2015
Event77th EAGE Conference & Exhibition 2015 - Madrid, Spain
Duration: 1 Jun 20154 Jun 2015

Conference

Conference77th EAGE Conference & Exhibition 2015
CountrySpain
CityMadrid
Period1/06/154/06/15

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