The effect of microbial processes on electrical properties of unconsolidated sediments was investigated in a laboratory experiment consisting of biotic and abiotic sand columns. The biotic column (nutrient, diesel and bacteria) showed (a) temporal increase in the real, imaginary, and surface conductivity, and (b) temporal decrease in the formation factor. The abiotic columns (nutrient; and nutrient and diesel) showed no significant changes. Increase in microbial population numbers, decrease in organic carbon source, nitrate, and sulfate and increase in dissolved inorganic carbon and fluid conductivity were indicative of microbial activity in the biotic column. We also measure relative increase in the interfacial electrical properties that exceed relative increase in the electrolytic conductivity. Thus changes in the real and imaginary conductivity were induced by microbial processes. These results suggest that interpretation of geoelectrical data from near surface environments should consider effects of microbial processes.
G. Z. Abdal Aal et al., "Effects of Microbial Processes on Electrolytic and Interfacial Electrical Properties of Unconsolidated Sediments," Geophysical Research Letters, vol. 31, no. 12, American Geophysical Union (AGU), Jun 2004.
The definitive version is available at http://dx.doi.org/10.1029/2004GL020030
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Biological Effects; Exploration Geophysics; Magnetic And Electrical Methods; Physical Properties Of Rocks; Electric Conductivity; Electrolysis; Electrolytes; Geophysics; Microorganisms; Nutrients; Organic Carbon; Abiotic Sand Columns; Electrolytic Conductivity; Microbial Processes; Sediments; Electrical Property; Microbial Activity; Sediment Property; Unconsolidated Medium; Dissolved Inorganic Carbon; Interfacial Electrical Properties; Laboratory Experiments; Microbial Activities; Microbial Populations; Surface Conductivity; Unconsolidated Sediment
Library of Congress Subject Headings
International Standard Serial Number (ISSN)
Article - Journal
© 2004 American Geophysical Union (AGU), All rights reserved.