EVALUATING THE RELATIONSHIP BETWEEN SUBSURFACE SELF-POTENTIAL (SP) SIGNALS AND MICROBIAL METABOLIC ACTIVITY IN AN ACTIVE PETROLEUM PLUME.
DOI:
https://doi.org/10.60787/tnamp.v25.717Keywords:
Biogeobattery, Self-potential, Hydrocarbon plume, Redox processes, Geophysical monitoringAbstract
The interpretation of self-potential mapping is described as the non-invasive tool for the detection of biogeobattery effects in a hydrocarbon contaminated subsurface environment. This paper summarizes geophysical properties of self-potential signals that may be generated by redox reactions, microbial activity and fluid motion in petroleum plumes. It emphasizes: the importance of microbial electron transfer and mineral polarization for the formation of electrochemical gradients that facilitate Hydrocarbon degradation. Reactions that are measurable on the surface of the geobattery give clues to the reactions taking place beneath the surface, which are important for electrochemical gradients. The paper compares the results of self- potential surveys with other geoelectrical techniques such as electrical resistivity tomography and induced polarization and discusses issues which have a bearing on data quality and interpretation, such as site conditions and electrode configuration. Finally, self-potential mapping is emphasized as a cost-effective and environmentally friendly tool for use in conjunction with hydrogeophysical and microbiological techniques in complex subsurface situations for contaminant source zonation, natural attenuation monitoring, and in remediation decisions.
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