The Apparent Anisotropy of the SEG-EAGE Overthrust Mode

The Apparent Anisotropy of the SEG-EAGE Overthrust Mode

Cupillard, Paul (Lorraine University)
Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics; Shell Global Solutions International B.V.)
Anquez, Pierre (Lorraine University)
Mazuyer, Antoine (Lorraine University; Stanford University)
Barthélémy, J. (Cerema: Center for Studies and Expertise on Risks, the Environment, Mobility and Planning)

2021

The Earth interior contains heterogeneities at all scales, ranging from pores and mineral grains to major global units. On the contrary, seismic recordings only contain variations larger than the minimum wavelength λmin. The heterogeneities smaller than λmin are naturally smoothed by the wavefield, leading to effective media when inverting seismic recordings to image the Earth. In particular, oriented small-scale structures lead to apparent anisotropy. In the present work, we apply the non-periodic homogenization method to the SEG-EAGE overthrust model to get the effective properties of a typical subsurface medium and to estimate the magnitude and the symmetry of the apparent anisotropy. We show that such anisotropy can reach 18%, most of it being explained by locally-tilted transverse isotropy. We also show that using the effective properties within an anisotropic wave simulator considerably decreases the computation requirement with respect to a wave simulation in the original model.

http://resolver.tudelft.nl/uuid:40d1d79d-86ef-4a7b-ab05-cae20d1a7659

https://doi.org/10.3997/2214-4609.202011955

EAGE

2021-06-11

Proceedings of the EAGE 2020 Annual Conference & Exhibition Online: December 8-11, 2020

EAGE 2020 Annual Conference & Exhibition Online, 2020-12-08 → 2020-12-11, Online event

Accepted Author Manuscript

Institutional Repository

conference paper

© 2021 Paul Cupillard, W.A. Mulder, Pierre Anquez, Antoine Mazuyer, J. Barthélémy