Wavefield decomposition of field data, using a shallow horizontal downhole sensor array and a free-surface constraint

Wavefield decomposition of field data, using a shallow horizontal downhole sensor array and a free-surface constraint

Grobbe, N.
van der Neut, J.R.
Almagro Vidal, C.
Drijkoningen, G.G.
Wapenaar, C.P.A.

Civil Engineering and Geosciences

Geoscience & Engineering

2014-06-19

Separation of recorded wavefields into downgoing and upgoing constituents is a technique that is used in many geophysical methods. The conventional, multi-component (MC) wavefield decomposition scheme makes use of different recorded wavefield components. In recent years, land acquisition designs have emerged that make use of shallow horizontal downhole sensor arrays. Inspired by marine acquisitiondesigns that make use of recordings at multiple depth levels for wavefield decomposition, we have recently developed a multi-depth level (MDL) wavefield decomposition scheme for land acquisition. Exploiting the underlying theory of this scheme, we now consider conventional, multi-component (MC) decomposition as an inverse problem, which we try to constrain in a better way. We have overdetermined the inverse problem by adding an MDL equation that exploits the Dirichlet free-surface boundary condition. To investigate the successfulness of this approach, we have applied both MC and combined MC-MDL decomposition to a real land dataset acquired in Annerveen, the Netherlands. Comparison of the results of overdetermined MC-MDL decomposition with the results of MC wavefield decomposition, clearly shows improvements in the obtained one-way wavefields, especially for the downgoing fields.

http://resolver.tudelft.nl/uuid:640f712d-dd99-4a5c-a65f-6e2fdcc50ba9

EAGE

Proceedings 76th EAGE Conference and Exhibition, Amsterdam (The Netherlands) 16-19 June, 2014

Institutional Repository

conference paper

(c) 2014 The Authors