This paper presents a preliminary evaluation of electromagnetic (EM) induction logging as a method for determining the in situ distribution of granulated iron within reactive treatment zones. A field experiment demonstrated that induction logging is useful in this application. The in-phase component response for a test region injected with an iron-bentonite mixture was significantly higher than the response observed for an iron-free region (i.e., 1500 ppt versus 1-10 ppt). The observed electrical conductivity for the test zones appears to be more strongly influenced by the bentonite in the injected mixture than by the presence of the granulated iron at the iron concentrations used. Laboratory measurements of the electrical conductivity and magnetic susceptibility of granulated iron mixtures were performed to further understand the tool response as a function of iron concentration within the treatment zone. These laboratory results qualitatively support the field observations; work on the quantitative connection between laboratory and field results is continuing.
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