A nanopetrographic and textural study of grain-coating chlorites in sandstone reservoirs

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doi: 10.1180/0009855033830098
Authors:Billault, V.; Beaufort, D.; Baronnet, A.; Lacharpagne, J. C.
Author Affiliations:Primary:
Laboratoire Hydr'ASA, Poitiers, France
Centre de Recherche sur les Mécanismes de la Croissance Cristalline, France
Volume Title:Chlorites; CNRS thematic school
Source:Clay Minerals, 38(3), p.315-328; CNRS thematic school, Ariege, France, Sept. 3-7, 2001. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:2003
Note:In English. 24 refs.; illus., incl. 3 tables
Summary:Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) investigations of chlorite grain coatings from four different sandstone reservoirs indicate a progressive change in both texture and arrangement of chlorite particles from the contact with the detrital substratum to the centre of the pore. Such spatial distribution results from growth by geometrical selection. Geometrical selection of chlorite crystals proceeded during a single event of continuous growth which began before the consolidation of the sandy sediments, lasted through part of the subsequent mechanical compaction and ceased before the occurrence of quartz cement. Nanopetrographic investigations near the detrital quartz-chlorite coating interface demonstrate that inhibition of the quartz cement is due to the limitation of the epitaxial growth of quartz to the interparticular space at the base of the chlorite coating and not an absence of nucleation. It is suggested that these results can be applied to most of the sandstones which contain Fe-rich chlorite grain coatings.
Sections:Clay minerals
Subsections:Petrology; weathering; soils
Mineral Groups:Sheet silicates
Subjects:Burial diagenesis; Chlorite; Chlorite group; Clastic rocks; Clay mineralogy; Diagenesis; Grains; Petrography; Reservoir rocks; Sandstone; Sedimentary rocks; SEM data; Sheet silicates; Silicates; TEM data; Textures
Abstract Numbers:04M/2770
Record ID:2004019797
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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