Fast nonrecursive 1D inversion by filtering acoustic-reflection data

Fast nonrecursive 1D inversion by filtering acoustic-reflection data

Slob, E.C. (TU Delft Applied Geophysics and Petrophysics)
Wapenaar, C.P.A. (TU Delft ImPhys/Acoustical Wavefield Imaging; TU Delft Applied Geophysics and Petrophysics)
Treitel, Sven (Tridekon)

2018

We derive a fast acoustic inversion method for a piecewise homogeneous horizontally layered medium. The method obtains medium parameters from the reflection response. The method can be implemented to obtain the parameters on either side of a reflector at an arbitrary depth. Three processing steps lead to the inversion result. First, we solve a modified Marchenko type equation to obtain a focusing wavefield. We then apply wavefield continuation across a reflecting boundary to the focusing wavefield and retrieve the reflection coefficient of a reflector as a function of horizontal slowness. Finally, we use the reflection coefficient to obtain the velocities and the ratio of the densities above and below the reflector. Because the two-way traveltime difference of the primary reflection and the one above it becomes known during the process, the thickness of the layer above the reflector is also found. The method can be applied multiple times in different zones, or recursively in a target zone without having to solve more Marchenko type equations. The numerical example illustrates that the method works well on modeled data without the need for a priori model information.

inversion
processing
acoustic

http://resolver.tudelft.nl/uuid:ec82b4a8-3f09-45c2-9506-1453e3a8d6fe

https://doi.org/10.1190/segam2018-2998538.1

SEG

2019-04-19

SEG Technical Program Expanded Abstracts 2018: 14-19 October 2018, Anaheim, United States

SEG Annual Meeting 2018, 2018-10-14 → 2018-10-19, Anaheim convention Center, Anaheim, United States

SEG Technical Program Expanded Abstracts 2018, 1949-4645

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

conference paper

© 2018 E.C. Slob, C.P.A. Wapenaar, Sven Treitel