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Thin‐bed AVO effects[Note 1. Paper presented at the 57th EAGE Conference — Geophysical ...]
Author(s) -
Bakke N. E.,
Ursin B.
Publication year - 1998
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1046/j.1365-2478.1998.00101.x
Subject(s) - offset (computer science) , amplitude versus offset , amplitude , geology , electrical impedance , economic geology , gemology , mineralogy , acoustics , optics , seismology , engineering geology , physics , telmatology , computer science , volcanism , quantum mechanics , tectonics , programming language
Tuning caused by closely spaced impedance boundaries affects seismic amplitudes. At zero‐offset the shape of the composite reflected signal approaches the time‐derivative of the original pulse as the layer thickness decreases. For layers thinner than half of the tuning thickness, the reflected amplitude is modified by a factor equal to twice the time‐thickness of the thin layer. Offset‐dependent tuning can be approximated by the time differences between primary reflections. For high‐velocity contrasts locally converted waves will also affect the total reflected seismic response. The contribution from intrabed multiples can, in most cases, be ignored. Correction for offset‐dependent tuning should be considered before conventional AVO analysis.