Integrated Earth Resistivity Tomography (ERT) and Multilevel Gas Sampling: A Tool to Map Geogenic and Anthropogenic Methane Accumulation on Brownfield Sites

Carlos A. Mendonça, Rory Doherty, Adalgiza Fornaro, Eduardo L. Abreu, Guilherme C. Novaes, Sérgio Jr. S. Fachin, Mauro A. La-Scalea

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    6 Citations (Scopus)
    340 Downloads (Pure)

    Abstract

    Soil gas emissions of methane and carbon dioxide on brownfield sites are usually attributed to anthropogenic activities; however geogenic sources of soil gas are often not considered during site investigation and risk management strategies. This paper presents a field study at a redeveloped brownfield site on a flood plain to identify accumulations of methane biogas trapped in underlying sediments. The investigation is based on a multidisciplinary approach using direct multi-level sampling measurements and Earth resistivity tomography . Resistivity imaging was applied to evaluate the feasibility of identifying the size and spatial continuity of soil gas accumulations in anthropogenic and naturally occurring deposits. As a result, biogas accumulations are described within both anthropogenic deposits and pristine organic sediments. This result is important to identify the correct approaches to identify and manage risks associated with soil gas emissions on brownfield and pristine sites. The organic-rich sediments in Quaternary fluvial environments of São Paulo Basin in particular the Tietê River, biogas reservoirs can be generated and trapped beneath geogenic and anthropogenic layers, potentially requiring the management of brownfield developments across this region.
    Original languageEnglish
    Pages (from-to)1217-1226
    Number of pages10
    JournalEnvironmental Earth Sciences
    Volume74
    Issue number2
    Early online date06 Feb 2015
    DOIs
    Publication statusPublished - Jul 2015

    Bibliographical note

    Upper Quartile Journal (Q2 - IF 1.57) with rigorous peer review - Novel method of monitoring biogas formation on Brownfield sties using geophysics

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