Electron microscopic observations of shale diagenesis, offshore Louisiana, USA, Gulf of Mexico |
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| Authors: | J-W Kim W R Bryant J S Watkins and T T Tieh |
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| Institution: | (1) Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA, US;(2) Department of Oceanography, Texas A&M University, College Station, TX 77843, USA, US |
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| 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.
Received: 12 May 1998 / Revision received: 14 July 1998 |
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