Integrated earth resistivity tomography (ERT) and multilevel sampling gas: a tool to map geogenic and anthropogenic methane accumulation on brownfield sites

Autor(es)

Mendonca, Carlos A. ^[1] ; Doherty, Rory ^[2] ; Fornaro, Adalgiza ^[3] ; Abreu, Eduardo L. ^[1] ; Novaes, Guilherme C. ^[4] ; Fachin, Jr., Sergio S. ^{[1, 4]} ; La-Scalea, Mauro A. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Geophys, BR-05508090 Sao Paulo, SP - Brazil

^[2] Queens Univ Belfast, Sch Planning Architecture & Civil Engn, Environm Engn Res Ctr, Belfast BT9 5AG, Antrim - North Ireland

^[3] Univ Sao Paulo, Dept Atmospher Sci, BR-05508090 Sao Paulo, SP - Brazil

^[4] Environm Geothecnol Ltd, TEC3GEO, BR-05508000 Sao Paulo, SP - Brazil

^[5] Fed Univ Sao Paulo UNIFESP, Dept Exact & Earth Sci, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL EARTH SCIENCES; v. 74, n. 2, p. 1217-1226, JUL 2015.
• Citações Web of Science: 2

Resumo

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 So Paulo Basin in particular the Tiet River, biogas reservoirs can be generated and trapped beneath geogenic and anthropogenic layers, potentially requiring the management of brownfield developments across this region. (AU)

• Processo FAPESP: 09/16948-8 - Sinais geofísicos associados à biodegradação de um aterro de resíduos
• Beneficiário: Carlos Alberto Mendonça
• Modalidade de apoio: Auxílio à Pesquisa - Regular