Computer Science
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..761f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 3, pp.761-768
Computer Science
1
Scientific paper
Hyperfiltration is sometimes cited as a mechanism to explain high degrees of calcite cementation at shale/sandstone contacts. To test this cementation mechanism, a series of experiments were performed in which solutions undersaturated with respect to calcite were hydraulically forced through a Ca-bentonite at different flow rates. Calcite precipitate was observed on the bentonite membrane from hyperfiltrated stock solutions having initial calcite saturation indices of 0.91 and 0.59. Supersaturation conditions at the clay's high-pressure interface are likely provided by establishment of a concentration polarization layer. In the subsurface, the driving force for hyperfiltration is a differential hydraulic pressure gradient acting across a shale membrane. This hydraulically-induced flux of solution causes a build-up of solute at the shale's high-pressure interface to levels that may exceed saturation indices of common cementing minerals like calcite. Although the source of the hydraulic pressure is likely due to compaction within the sedimentary pile, directional flow constraints suggest that hyperfiltration-induced precipitation of calcite occurs at sand/shale boundaries away from areas of active compaction.
Eady Craig D.
Fritz Steven J.
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