Grain and pore microtexture in sandstone sill and depositional sandstone reservoirs: preliminary insights

Feng Wu (Corresponding Author), Andrew Hurst, Antonio Grippa

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Abstract

Petrographical microtextural analysis and conventional core-plug analysis of samples from a depositional sandstone and a sandstone sill are used to compare with similar data derived from micro-CT (MCT) analysis of the same samples. A remarkable richness of information derived from the MCT data identifies isotropic granular and pore fabrics at the micrometre-scale in the sandstone sill that contrast markedly with the laminated fabric in the depositional sandstone. In the sandstone sill, porosity and permeability are more homogenous than in the depositional sandstone, in which lamination creates approaching two-orders of magnitude difference in permeability and enhances horizontal permeability relative to vertical permeability. In the sill, lower pore- and throat-shape factors and larger pore coordinate numbers are present than in the depositional sandstone. Preservation of the isotropic pore and grain structure in the sandstone sill is indicative of significant fluidized flow normal to the fracture margin during emplacement.
Original languageEnglish
Pages (from-to)236-243
Number of pages8
JournalPetroleum Geoscience
Volume24
Issue number2
Early online date7 Dec 2017
DOIs
Publication statusPublished - 31 May 2018

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Sandstone
sill
sandstone
permeability
Crystal microstructure
lamination
Pore structure
emplacement
Porosity
porosity
analysis

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Grain and pore microtexture in sandstone sill and depositional sandstone reservoirs : preliminary insights. / Wu, Feng (Corresponding Author); Hurst, Andrew; Grippa, Antonio.

In: Petroleum Geoscience, Vol. 24, No. 2, 31.05.2018, p. 236-243.

Research output: Contribution to journalArticle

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abstract = "Petrographical microtextural analysis and conventional core-plug analysis of samples from a depositional sandstone and a sandstone sill are used to compare with similar data derived from micro-CT (MCT) analysis of the same samples. A remarkable richness of information derived from the MCT data identifies isotropic granular and pore fabrics at the micrometre-scale in the sandstone sill that contrast markedly with the laminated fabric in the depositional sandstone. In the sandstone sill, porosity and permeability are more homogenous than in the depositional sandstone, in which lamination creates approaching two-orders of magnitude difference in permeability and enhances horizontal permeability relative to vertical permeability. In the sill, lower pore- and throat-shape factors and larger pore coordinate numbers are present than in the depositional sandstone. Preservation of the isotropic pore and grain structure in the sandstone sill is indicative of significant fluidized flow normal to the fracture margin during emplacement.",
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note = "We would like to express our gratitude to Dr Mehmet Kartal and Professor Dubravka Pokrajac for their help in micro-CT scanning and the use of Avizo software. We would like to thank Dr Giuseppe Palladino for the help in rock sample collection. We also very grateful to the anonymous reviewers for their valuable suggestions and the editors for their hard work, the feedback from them has led to considerable improvements in this manuscript.",
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