A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)

A combined study of rock-magnetism and electronic-paramagnetic resonance (EPR) was performed in core samples from an oil well in the Vaca Muerta Formation (SW Argentina). The aim of this work was to characterize the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales. S...

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Autores principales:	Costanzo-Álvarez, V., Rapalini, A.E., Aldana, M., Díaz, M., Kietzmann, D., Iglesia-Llanos, M.P., Cabrera, A., Luppo, T., Vallejo, M.D., Walther, A.M.
Formato:	JOUR
Materias:	EPR Extractable organic matter Oil shales Organic matter free radicals Rock magnetism Biogeochemistry Biological materials Crude oil Electron spin resonance spectroscopy Free radicals Gamma rays Hydrocarbons Iron oxides Lithology Magnetic susceptibility Natural resources management Neutron logging Oil shale Oil well logging Oil wells Paramagnetic resonance Pyrites Rocks Scanning electron microscopy Sedimentology Sulfur compounds Calcareous cementation Electronic paramagnetic resonance Natural remanent magnetization Petrophysical properties Specific magnetic susceptibility X-ray energy dispersions Magnetism diagenesis electron spin resonance free radical hydrocarbon reservoir magnetic susceptibility oil shale organic matter remanent magnetization rock property Argentina
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09204105_v_n_p861_CostanzoAlvarez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09204105_v_n_p861_CostanzoAlvarez
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spelling	todo:paper_09204105_v_n_p861_CostanzoAlvarez2023-10-03T15:44:52Z A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina) Costanzo-Álvarez, V. Rapalini, A.E. Aldana, M. Díaz, M. Kietzmann, D. Iglesia-Llanos, M.P. Cabrera, A. Luppo, T. Vallejo, M.D. Walther, A.M. EPR Extractable organic matter Oil shales Organic matter free radicals Rock magnetism Biogeochemistry Biological materials Crude oil Electron spin resonance spectroscopy Free radicals Gamma rays Hydrocarbons Iron oxides Lithology Magnetic susceptibility Natural resources management Neutron logging Oil shale Oil well logging Oil wells Paramagnetic resonance Pyrites Rocks Scanning electron microscopy Sedimentology Sulfur compounds Calcareous cementation Electronic paramagnetic resonance Extractable organic matter Natural remanent magnetization Petrophysical properties Rock magnetism Specific magnetic susceptibility X-ray energy dispersions Magnetism diagenesis electron spin resonance free radical hydrocarbon reservoir magnetic susceptibility oil shale organic matter remanent magnetization rock property Argentina A combined study of rock-magnetism and electronic-paramagnetic resonance (EPR) was performed in core samples from an oil well in the Vaca Muerta Formation (SW Argentina). The aim of this work was to characterize the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales. Similar research has been previously conducted in near-surface sediments affected by oil and gas microseepage, so as to establish a relationship between micromagnetic anomalies and the underlying reservoirs. The EPR technique was employed to measure minute concentrations of organic matter free radicals (OMFRs), Fe3+ and Mn2+. These results, and the concentrations of extractable organic matter (EOM), were compared with mass-specific magnetic susceptibility (χ) and natural remanent magnetization (NRM). The reactive OMFRs, resulting from the thermal degradation of a kerogen that yields a slightly-biodegraded crude oil, seem to have acted on the primary Fe oxides and sulfides through two diagenetic stages. The first stage might have partially dissolved these minerals. Consequently, a number of depth levels show a decrease of both χ and NRM, against an increase of the OMFRs. On the other hand, for a core-interval between 2663 and 2695 m (P18/P24), a second diagenetic stage could have produced partial replacement of framboidal pyrite by authigenic pyrrhotite, as recognized by scanning electron microscopy (SEM), electron X-ray energy dispersion (EDX) experiments and the analysis of the thermomagnetic and IRM curves. Thus, within P18/P24, magnetic parameters increase in direct proportion with the amount of OMFRs. The lithologies encompassed by P18/P24 show small levels of Mn2+, a proxy directly related to calcareous cementation. Moreover, Gamma Ray, resistivity and neutron porosity well logs reveal distinctive features for P18/P24, as well as an increase of hydrocarbon content, contrasting with the rest of the section analyzed. The hydrocarbon-induced magnetic anomalies in these oil shales seem to be conditioned mostly by their petrophysical properties. © 2018 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09204105_v_n_p861_CostanzoAlvarez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	EPR Extractable organic matter Oil shales Organic matter free radicals Rock magnetism Biogeochemistry Biological materials Crude oil Electron spin resonance spectroscopy Free radicals Gamma rays Hydrocarbons Iron oxides Lithology Magnetic susceptibility Natural resources management Neutron logging Oil shale Oil well logging Oil wells Paramagnetic resonance Pyrites Rocks Scanning electron microscopy Sedimentology Sulfur compounds Calcareous cementation Electronic paramagnetic resonance Extractable organic matter Natural remanent magnetization Petrophysical properties Rock magnetism Specific magnetic susceptibility X-ray energy dispersions Magnetism diagenesis electron spin resonance free radical hydrocarbon reservoir magnetic susceptibility oil shale organic matter remanent magnetization rock property Argentina
spellingShingle	EPR Extractable organic matter Oil shales Organic matter free radicals Rock magnetism Biogeochemistry Biological materials Crude oil Electron spin resonance spectroscopy Free radicals Gamma rays Hydrocarbons Iron oxides Lithology Magnetic susceptibility Natural resources management Neutron logging Oil shale Oil well logging Oil wells Paramagnetic resonance Pyrites Rocks Scanning electron microscopy Sedimentology Sulfur compounds Calcareous cementation Electronic paramagnetic resonance Extractable organic matter Natural remanent magnetization Petrophysical properties Rock magnetism Specific magnetic susceptibility X-ray energy dispersions Magnetism diagenesis electron spin resonance free radical hydrocarbon reservoir magnetic susceptibility oil shale organic matter remanent magnetization rock property Argentina Costanzo-Álvarez, V. Rapalini, A.E. Aldana, M. Díaz, M. Kietzmann, D. Iglesia-Llanos, M.P. Cabrera, A. Luppo, T. Vallejo, M.D. Walther, A.M. A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
topic_facet	EPR Extractable organic matter Oil shales Organic matter free radicals Rock magnetism Biogeochemistry Biological materials Crude oil Electron spin resonance spectroscopy Free radicals Gamma rays Hydrocarbons Iron oxides Lithology Magnetic susceptibility Natural resources management Neutron logging Oil shale Oil well logging Oil wells Paramagnetic resonance Pyrites Rocks Scanning electron microscopy Sedimentology Sulfur compounds Calcareous cementation Electronic paramagnetic resonance Extractable organic matter Natural remanent magnetization Petrophysical properties Rock magnetism Specific magnetic susceptibility X-ray energy dispersions Magnetism diagenesis electron spin resonance free radical hydrocarbon reservoir magnetic susceptibility oil shale organic matter remanent magnetization rock property Argentina
description	A combined study of rock-magnetism and electronic-paramagnetic resonance (EPR) was performed in core samples from an oil well in the Vaca Muerta Formation (SW Argentina). The aim of this work was to characterize the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales. Similar research has been previously conducted in near-surface sediments affected by oil and gas microseepage, so as to establish a relationship between micromagnetic anomalies and the underlying reservoirs. The EPR technique was employed to measure minute concentrations of organic matter free radicals (OMFRs), Fe3+ and Mn2+. These results, and the concentrations of extractable organic matter (EOM), were compared with mass-specific magnetic susceptibility (χ) and natural remanent magnetization (NRM). The reactive OMFRs, resulting from the thermal degradation of a kerogen that yields a slightly-biodegraded crude oil, seem to have acted on the primary Fe oxides and sulfides through two diagenetic stages. The first stage might have partially dissolved these minerals. Consequently, a number of depth levels show a decrease of both χ and NRM, against an increase of the OMFRs. On the other hand, for a core-interval between 2663 and 2695 m (P18/P24), a second diagenetic stage could have produced partial replacement of framboidal pyrite by authigenic pyrrhotite, as recognized by scanning electron microscopy (SEM), electron X-ray energy dispersion (EDX) experiments and the analysis of the thermomagnetic and IRM curves. Thus, within P18/P24, magnetic parameters increase in direct proportion with the amount of OMFRs. The lithologies encompassed by P18/P24 show small levels of Mn2+, a proxy directly related to calcareous cementation. Moreover, Gamma Ray, resistivity and neutron porosity well logs reveal distinctive features for P18/P24, as well as an increase of hydrocarbon content, contrasting with the rest of the section analyzed. The hydrocarbon-induced magnetic anomalies in these oil shales seem to be conditioned mostly by their petrophysical properties. © 2018 Elsevier B.V.
format	JOUR
author	Costanzo-Álvarez, V. Rapalini, A.E. Aldana, M. Díaz, M. Kietzmann, D. Iglesia-Llanos, M.P. Cabrera, A. Luppo, T. Vallejo, M.D. Walther, A.M.
author_facet	Costanzo-Álvarez, V. Rapalini, A.E. Aldana, M. Díaz, M. Kietzmann, D. Iglesia-Llanos, M.P. Cabrera, A. Luppo, T. Vallejo, M.D. Walther, A.M.
author_sort	Costanzo-Álvarez, V.
title	A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
title_short	A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
title_full	A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
title_fullStr	A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
title_full_unstemmed	A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)
title_sort	combined rock-magnetic and epr study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (vaca muerta formation, southwestern argentina)
url	http://hdl.handle.net/20.500.12110/paper_09204105_v_n_p861_CostanzoAlvarez
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A combined rock-magnetic and EPR study about the effects of hydrocarbon-related diagenesis on the magnetic signature of oil shales (Vaca Muerta formation, southwestern Argentina)

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