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Geo-Marine Letters

, Volume 18, Issue 3, pp 234–240 | Cite as

Electron microscopic observations of shale diagenesis, offshore Louisiana, USA, Gulf of Mexico

  • J. -W. Kim
  • W. R. Bryant
  • J. S. Watkins
  • T. T. Tieh
Article

Abstract

Scanning and transmission electron microscopic analyses of shale samples from offshore Louisiana, USA, Gulf of Mexico, reveal the relationship between mineralogical and microfabric changes during burial diagenesis. The local geopressured zone begins at 2200-m depth. Above that depth the shales are smectite-rich, generally lack particle orientation, and contain appreciable pores. Below the 2200-m depth, the shales become more illite-rich with increasing burial, more crystalline, and less porous. Microfabric changes are mainly caused by compaction during burial diagenesis; mineralogical changes (smectite-to-illite) and crystal growth also play an important role in fabric alteration during deep burial diagenesis.

Keywords

Shale Burial Diagenesis Shale Sample Clay Platelet 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • J. -W. Kim
    • 1
  • W. R. Bryant
    • 2
  • J. S. Watkins
    • 1
  • T. T. Tieh
    • 1
  1. 1.Department of Geology and GeophysicsTexas A&M UniversityCollege StationUSA
  2. 2.Department of OceanographyTexas A&M UniversityCollege StationUS

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