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GEOREF RECORD

Attenuation and anisotropy; the effect of extra fine layering

Mark S. Sams
Attenuation and anisotropy; the effect of extra fine layering
Geophysics (December 1995) 60 (6): 1646-1655

Abstract

Layering that is finer than that typically resolved by sonic logging will contribute to apparent attenuation and anisotropy in the sonic-to-seismic frequency range. The significance of this contribution can be discerned through resolution enhancement of sonic and density logs. In this study a borehole compensated sonic and density log recorded in a cyclical sedimentary sequence have been enhanced by response matching with a high-resolution microresistivity log. The additional resolved layering increases the layer-induced dispersion by 50%, with the additional attenuation showing a peak with a Q of 135 at 1.2 kHz. The increase in average anisotropy is frequency dependent with a minimum increase of 50% at zero frequency. In the absence of high-resolution data, the effects of layering can be severely underestimated, resulting in poor estimates of the intrinsic properties of rocks and their pore fluids.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 60
Serial Issue: 6
Title: Attenuation and anisotropy; the effect of extra fine layering
Author(s): Sams, Mark S.
Affiliation: Imperial College, Department of Geology, London, United Kingdom
Pages: 1646-1655
Published: 199512
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 31
Accession Number: 1996-001892
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 199601
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