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Predicting seismic velocity and other rock properties from clay content only

Lincoln F. Pratson, Anastasia Stroujkova, Damian Herrick, Fred Boadu and Peter Malin
Predicting seismic velocity and other rock properties from clay content only
Geophysics (December 2003) 68 (6): 1847-1856

Abstract

It has been shown that accurate predictions of compressional and shear-wave velocities can be derived from measurements of clay content, porosity, and bulk density. In this paper, we test the efficacy of using a sequence of established petrophysical formulations to go a step further and predict porosity and bulk density as well as velocity from clay content alone. Other variables, like grain and pore-fluid properties, are assumed to be constant, while empirical relationships are used to model such behaviors as grain packing and compaction. The sequence of formulations, referred to as the "model," is evaluated using well-log and core data from the Amazon Fan collected during Ocean Drilling Program Leg 155. Clay contents are estimated from the borehole gamma-ray logs. These are input to the model, which in turn predicts observed porosities to a rms error of <20%, and bulk densities and compressional velocities to rms errors of <-10%. The results suggest that with better measurements of clay content and improvements to the model, even more accurate predictions of velocity might be achieved for unconsolidated sediments.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 68
Serial Issue: 6
Title: Predicting seismic velocity and other rock properties from clay content only
Affiliation: Duke University, Department of Earth and Ocean Sciences, Durham, NC, United States
Pages: 1847-1856
Published: 200312
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 32
Accession Number: 2005-018578
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N06°56'58" - N06°56'58", W47°55'10" - W47°55'10"
N05°56'22" - N05°56'22", W47°45'26" - W47°45'26"
N05°37'56" - N05°37'56", W47°44'08" - W47°44'08"
Secondary Affiliation: University of Connecticut, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200509
Program Name: ODPOcean Drilling Program
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