Textural and geochemical micro-analysis in the interpretation of clay mineral characteristics: lessons from sandstone hydrocarbon reservoirs

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Abstract

Back-scattered electron images of clay minerals from sandstones are used, together with complementary micro-analytical methods, to identify and quantify mineral microporosity and geochemistry. Clay minerals typically have a range of microporosity from 10 to >90% dependent on texture and paragenesis. Fibrous clays are highly microporous; detrital clays have low microporosity but specific clay minerals have broad ranges of microporosity. The often quoted mineral-chemical association between thorium (Th) and kaolinite cannot be substantiated by micro-analysis. The Th content of clay minerals is associated with micro-inclusions within the kaolinite which form diagenetically or are derived from precursor minerals.

Original languageEnglish
Pages (from-to)137-149
Number of pages13
JournalClay Minerals
Volume34
Issue number1
DOIs
Publication statusPublished - 1 Mar 1999

Keywords

  • PETROPHYSICAL EVALUATION
  • ELECTRON-MICROSCOPY
  • MICROPOROSITY

Cite this

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title = "Textural and geochemical micro-analysis in the interpretation of clay mineral characteristics: lessons from sandstone hydrocarbon reservoirs",
abstract = "Back-scattered electron images of clay minerals from sandstones are used, together with complementary micro-analytical methods, to identify and quantify mineral microporosity and geochemistry. Clay minerals typically have a range of microporosity from 10 to >90{\%} dependent on texture and paragenesis. Fibrous clays are highly microporous; detrital clays have low microporosity but specific clay minerals have broad ranges of microporosity. The often quoted mineral-chemical association between thorium (Th) and kaolinite cannot be substantiated by micro-analysis. The Th content of clay minerals is associated with micro-inclusions within the kaolinite which form diagenetically or are derived from precursor minerals.",
keywords = "PETROPHYSICAL EVALUATION, ELECTRON-MICROSCOPY, MICROPOROSITY",
author = "A Hurst",
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publisher = "Mineralogical Society",
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TY - JOUR

T1 - Textural and geochemical micro-analysis in the interpretation of clay mineral characteristics

T2 - lessons from sandstone hydrocarbon reservoirs

AU - Hurst, A

PY - 1999/3/1

Y1 - 1999/3/1

N2 - Back-scattered electron images of clay minerals from sandstones are used, together with complementary micro-analytical methods, to identify and quantify mineral microporosity and geochemistry. Clay minerals typically have a range of microporosity from 10 to >90% dependent on texture and paragenesis. Fibrous clays are highly microporous; detrital clays have low microporosity but specific clay minerals have broad ranges of microporosity. The often quoted mineral-chemical association between thorium (Th) and kaolinite cannot be substantiated by micro-analysis. The Th content of clay minerals is associated with micro-inclusions within the kaolinite which form diagenetically or are derived from precursor minerals.

AB - Back-scattered electron images of clay minerals from sandstones are used, together with complementary micro-analytical methods, to identify and quantify mineral microporosity and geochemistry. Clay minerals typically have a range of microporosity from 10 to >90% dependent on texture and paragenesis. Fibrous clays are highly microporous; detrital clays have low microporosity but specific clay minerals have broad ranges of microporosity. The often quoted mineral-chemical association between thorium (Th) and kaolinite cannot be substantiated by micro-analysis. The Th content of clay minerals is associated with micro-inclusions within the kaolinite which form diagenetically or are derived from precursor minerals.

KW - PETROPHYSICAL EVALUATION

KW - ELECTRON-MICROSCOPY

KW - MICROPOROSITY

U2 - 10.1180/000985599545993

DO - 10.1180/000985599545993

M3 - Article

VL - 34

SP - 137

EP - 149

JO - Clay Minerals

JF - Clay Minerals

SN - 0009-8558

IS - 1

ER -