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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Effects of Differential Cementation on the Sonic 
Velocities
of Upper Cretaceous
Skeletal Grainstones (Southeastern Netherlands)
Jeroen A. M. Kenter, Bruce W. Fouke, Marc Reinders
ABSTRACT
velocities measured in Cretaceous skeletal grainstones from
Limburg, southeastern Netherlands, are significantly higher in moderately
cemented samples than in poorly cemented samples from similar depositional
facies. Petrography suggests that this relationship is due to differences
in the extent of development of intergranular cementation as influenced
by original grain mineralogy, rather than a significant difference in primary
porosity. The time-average velocity equation for a calcite matrix fails
to predict the cementation effect on sonic velocity at high porosities.
Linear and nonlinear time-average regressions show strong correlation between
velocity and porosity. Whether the underlying trend is linear or nonlinear
is a fundamental question that cannot be determined with this data set.
Comparison between carbonate grainstones and siliciclastic sandstones
reveals that: (1) the grainstones have gradients in velocity-porosity space
similar to those in siliciclastic arenites but have velocities that are
up to 0.3 km/s higher than those in clean arenites and up to 0.8 km/s higher
than in argillaceous arenites; and (2) grainstones develop a rigid framework
that transports elastic waves at significantly higher porosities
than arenites,
40-50% compared to 30-40%. Higher sonic velocity presumably results from
the higher matrix velocity of calcite versus quartz, and the higher elastic
moduli created by the effective cement bridges connecting grains.
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