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Title: Integrated earth resistivity tomography (ERT) and multilevel sampling gas : a tool to map geogenic and anthropogenic methane accumulation on brownfield sites.
Authors: Mendonça, Carlos Alberto
Doherty, Rory
Fornaro, Adalgiza
Abreu, Eduardo L.
Novaes, Guilherme do Carmo
Fachin, Sergio Junior da Silva
La Scalea, Mauro Aquiles
Keywords: Methane
Quaternary sediments
São Paulo Basin
Earth resistivity tomography
Issue Date: 2015
Citation: MENDONÇA, C. A. et al. Integrated earth resistivity tomography (ERT) and multilevel sampling gas: a tool to map geogenic and anthropogenic methane accumulation on brownfield sites Environmental Earth Sciences, v. 74, p. 1217–1226, 2015. Disponível em: <>. Acesso em: 20 jun. 2017.
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 andmanage risks associated with soil gas emissions on brownfield and pristine sites. The organic-rich sediments in Quaternary fluvial environments of Sa˜o Paulo Basin in particular the Tieteˆ River, biogas reservoirs can be generated and trapped beneath geogenic and anthropogenic layers, potentially requiring the management of brownfield developments across this region.
ISSN: 1866-6299 
Appears in Collections:DEGEO - Artigos publicados em periódicos

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