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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract



Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
Vol. 67 (1997)No. 1. (January), Pages 178-185

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

P-wave 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 Previous HitvelocityNext Hit equation for a calcite matrix fails to predict the cementation Previous HiteffectNext Hit on sonic Previous HitvelocityNext Hit at high porosities. Linear and nonlinear time-average regressions show strong correlation between Previous HitvelocityNext Hit 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 Previous HitvelocityNext Hit-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 Previous HitvelocityNext Hit presumably results from the higher matrix Previous HitvelocityTop of calcite versus quartz, and the higher elastic moduli created by the effective cement bridges connecting grains.


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