Microfabric and anisotropy of elastic waves in sandstone - An observation using high-resolution X-ray microtomography.

Kahl, Wolf-Achim, Hinkes, R., Feeser, Volker and Holzheid, Astrid (2013) Microfabric and anisotropy of elastic waves in sandstone - An observation using high-resolution X-ray microtomography. Journal of Structural Geology, 49 . pp. 35-49. DOI 10.1016/j.jsg.2013.01.006.

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Abstract

Petrophysical experiments, using acoustic velocities to characterise anisotropies of mechanical behaviour of rocks are of essential relevance to understand the geomechanical behaviour of sandstone reservoirs under changing stress fields. Here, we present high-resolution X-ray microtomography (μ-CT) as a supplementary research tool to interpret anisotropic ultrasound velocities in sandstones with variation of isotopic stress.
Specimens of two Lower Cretaceous sandstones (localities Bentheim and Obernkirchen, both Germany) have been used in petrophysical laboratory experiments under dry conditions to study ultrasonic sound velocities (frequency of signal input 1 MHz). Subsequently, oriented micro-plugs drilled from the sandstone samples were investigated using high-resolution X-ray microtomography. By means of image processing of the reconstructed scan images, geometric attributes such as mean structural thickness, orientation and tortuosity were evaluated from the μ-CT data for both pore space and grain skeleton. Our observations clearly indicate the different roles of pore space and grain skeleton in regard to the propagation of ultrasonic waves: because the pores do not transmit the waves, it was sufficient to investigate the average thickness of this fabric element. In contrast, as the ultrasonic waves traverse the rock via the adjacent grains, it was necessary to survey the actual travel lengths of seismic waves in the sandstone grain skeleton.

Document Type: Article
Additional Information: Times Cited: 0 Kahl, Wolf-Achim Hinkes, Robert Feeser, Volker Holzheid, Astrid
Keywords: X-ray microtomography, Sandstone, Anisotropy, Tortuosity, Elastic waves, 3D multi anvil pressure apparatus, Geomechanics
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.jsg.2013.01.006
ISSN: 0191-8141
Projects: Future Ocean
Date Deposited: 08 Jul 2014 09:26
Last Modified: 23 Sep 2019 20:50
URI: http://oceanrep.geomar.de/id/eprint/25020

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