The origin of consolidation laminae and dish structures in some deep-water sandstones

Andrew Hurst, Bryan Thomas Cronin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Consolidation laminae and dish structures form high-density zones that are interpreted to have formed by disruption of primary structures during gravitational collapse of the grain framework during water escape and consolidation. They are not associated with higher contents of clay-size material than adjacent units, but the chloritic clay minerals associated with consolidation laminae and dish structures have a different microtexture than observed elsewhere. Clay mineral texture has a direct effect an petrophysical characteristics, in particular water saturation and conductivity in hydrocarbon-saturated intervals. CT-scans identify consolidation laminae and dish structures as zones of high density that correspond to tighter packing of sand grains and are unrelated to clay distribution. Dish structures may form independently of consolidation laminae or by further modification of fragmented consolidation laminae.

Original languageEnglish
Pages (from-to)136-143
Number of pages7
JournalJournal of Sedimentary Research
Volume71
Issue number1
Publication statusPublished - 2001

Keywords

  • ESCAPE STRUCTURES
  • RESERVOIRS
  • SEDIMENTS

Cite this

The origin of consolidation laminae and dish structures in some deep-water sandstones. / Hurst, Andrew; Cronin, Bryan Thomas.

In: Journal of Sedimentary Research, Vol. 71, No. 1, 2001, p. 136-143.

Research output: Contribution to journalArticle

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AB - Consolidation laminae and dish structures form high-density zones that are interpreted to have formed by disruption of primary structures during gravitational collapse of the grain framework during water escape and consolidation. They are not associated with higher contents of clay-size material than adjacent units, but the chloritic clay minerals associated with consolidation laminae and dish structures have a different microtexture than observed elsewhere. Clay mineral texture has a direct effect an petrophysical characteristics, in particular water saturation and conductivity in hydrocarbon-saturated intervals. CT-scans identify consolidation laminae and dish structures as zones of high density that correspond to tighter packing of sand grains and are unrelated to clay distribution. Dish structures may form independently of consolidation laminae or by further modification of fragmented consolidation laminae.

KW - ESCAPE STRUCTURES

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