Variation of pore fabric across a fold-thrust structure

Details Variation of pore fabric across a fold-thrust structure Variation of pore fabric across a fold-thrust structure

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2147p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 19, p. 2147-2150

Physics

7

Folds (Geology), Microcracks, Permeability, Porosity, Stratification, Anisotropy, Magnetic Effects, Petrology, Scanning Electron Microscopy, Tectonics

Scientific paper

Variations of pore orientation, pore shape, porosity, and hydraulic permeability, within a siltstone unit of a fold-thrust structure, are determined using magnatic pore fabric analysis, mercury injection porosimetry, and scanning electron microscopy (SEM). While samples in the foreland show evidence for the preservation of depositional pore geometry, the progressively deformed thrust sheet reveals increasingly oblate pore fabric anisotropy with microcrack planes oriented normal to the tectonic transport direction. Porosity, pore throat sizes, and permeability, show corresponding spatial variations across the structure. Independent of the deformation state within the thrust sheet, pore and magnetic grain fabric correlate closely in orientation.

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