The influence of mean grain size on unconfined compressive strength of weakly consolidated reservoir sandstones

Hadi Atapour, Ali Mortazavi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effects of mean grain size on unconfined compressive strength (UCS) of weakly consolidated reservoir sandstones are studied by series of unconfined compressive tests performed. According to previous studies, the influence of grain size on rock strength is not clear and inconsistent results are reported. In this study, categorizing the rocks studied in previous researches into two classes of non-porous crystalline and porous granular rocks, it was found that the compressive strength of all investigated crystalline rocks is inversely related to the mean grain size, while in the case of granular porous rocks (e.g. sandstones) different results are obtained by different researchers. In current investigation, the obtained experimental results indicated that grain size alone is not a suitable indicator of the compressive strength of porous sandstone. The reason for this is that except grain size, other textural characteristics such as pore spaces and cementation, play important roles in the strength of sandstones and should be considered along with the grain size. Based on these results, an empirical model was developed to estimate the unconfined compressive strength of porous sandstones based on grain size, porosity, and cement content. The validity of the suggested empirical model for natural sandstones was checked against data reported in the literature.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalJournal of Petroleum Science and Engineering
Volume171
DOIs
Publication statusPublished - Dec 1 2018
Externally publishedYes

Fingerprint

Sandstone
compressive strength
Compressive strength
grain size
sandstone
Rocks
rock
Crystalline rocks
crystalline rock
pore space
cementation
Cements
Porosity
cement
Crystalline materials
porosity

Keywords

  • Grain size
  • Petrographical properties
  • Porosity
  • Uniaxial compressive strength
  • Weakly consolidated reservoir sandstone

ASJC Scopus subject areas

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

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abstract = "The effects of mean grain size on unconfined compressive strength (UCS) of weakly consolidated reservoir sandstones are studied by series of unconfined compressive tests performed. According to previous studies, the influence of grain size on rock strength is not clear and inconsistent results are reported. In this study, categorizing the rocks studied in previous researches into two classes of non-porous crystalline and porous granular rocks, it was found that the compressive strength of all investigated crystalline rocks is inversely related to the mean grain size, while in the case of granular porous rocks (e.g. sandstones) different results are obtained by different researchers. In current investigation, the obtained experimental results indicated that grain size alone is not a suitable indicator of the compressive strength of porous sandstone. The reason for this is that except grain size, other textural characteristics such as pore spaces and cementation, play important roles in the strength of sandstones and should be considered along with the grain size. Based on these results, an empirical model was developed to estimate the unconfined compressive strength of porous sandstones based on grain size, porosity, and cement content. The validity of the suggested empirical model for natural sandstones was checked against data reported in the literature.",
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author = "Hadi Atapour and Ali Mortazavi",
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AU - Mortazavi, Ali

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AB - The effects of mean grain size on unconfined compressive strength (UCS) of weakly consolidated reservoir sandstones are studied by series of unconfined compressive tests performed. According to previous studies, the influence of grain size on rock strength is not clear and inconsistent results are reported. In this study, categorizing the rocks studied in previous researches into two classes of non-porous crystalline and porous granular rocks, it was found that the compressive strength of all investigated crystalline rocks is inversely related to the mean grain size, while in the case of granular porous rocks (e.g. sandstones) different results are obtained by different researchers. In current investigation, the obtained experimental results indicated that grain size alone is not a suitable indicator of the compressive strength of porous sandstone. The reason for this is that except grain size, other textural characteristics such as pore spaces and cementation, play important roles in the strength of sandstones and should be considered along with the grain size. Based on these results, an empirical model was developed to estimate the unconfined compressive strength of porous sandstones based on grain size, porosity, and cement content. The validity of the suggested empirical model for natural sandstones was checked against data reported in the literature.

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