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Lidia Regina Nascimento - One of the best experts on this subject based on the ideXlab platform.

  • Detalhes da historia geologica de Campo de Albacora - Bacia de Campos a partir de biomarcadores acidos
    2017
    Co-Authors: Lidia Regina Nascimento
    Abstract:

    Resumo: A análise por cromatografia gasosa acoplada a espectrometria de massas (GC/MS) de oito petróleos do Campo de Albacora - Bacia de Campos (RJ), através do estudo de biomarcadores ácidos evidenciaram a sensibilidade desta fração a fenômenos geológicos ocorridos durante o período de preenchimento dos reservatórios. Através de estudos multidisciplinares foi sugerido que os óleos dos reservatórios de Albacora são misturas de dois pulsos de óleos com diferente evolução térmica. Através da análise dos respectivos cromatogramas reconstruídos de íons dos ésteres metílicos e dos correspondentes hidrocarbonetos derivatizados dos ácidos hopanóicos, (RIC m/z 191 e m/z 219), pudemos destacar as diferenças na evolução térmica das amostras estudadas. Através da análise dos ácidos lineares pudemos detectar a ocorrência de geocromatografia entre dois poços (A e B) e principalmente reconhecer na distribuição dos ácidos lineares de cadeia longa do óleo F as características bastante preservadas do óleo gerado no primeiro pulso. Salientamos que estas observações só foram possíveis com o estudo das frações ácidas. A coinjeção do padrão 1-(3',7' dimetil-nonanil) 2,2,6 trimetil- cicloexano auxiliou na detecção da série que apresenta o fragmento característico m/z 125 e orientou na atribuição da cadeia lateral da série majoritária como sendo linear. Nosso estudo na fração ácida derivatizada a hidrocarbonetos de oito amostras de óleos de seis reservatórios resultou na identificação de 16 classes de compostos ácidos. Na fração neutra, estudada com intuito de obter parâmetros para comparação com a fração ácida derivatizada a hidrocarbonetos identificamos 17 classes de compostos normalmente identificados em petróleos. Foi confirmada pela coinjeção de padrões sintéticos com o óleo H a presença de 8a(H) drimano na fração neutra. A identificação deste composto nas outas amostras de óleo foi por comparação dos respectivos espectros e massas e índice de retenção. Relação dos compostos identificados neste trabalho: 17 classes de compostos na fracão neutra 1. hidrocarbonetos lineares (C11 a C33) 2. hidrocarbonetos isoprenóides (Pristano e Fitano) 3. n-alquil-cicloexano (C11 a C25) 4. metil-n-alquil-cicloexano (C12 a C25) 5. terpanos bicíclicos da classe dos drimanos (C14 a C19) 6. terpanos bicíclicos da classe dos drimanos rearranjados (C14 a C16) 7. terpanos tricíclicos do tipo queilantano (C19 a C29) 8. terpano tetracíclico (C24) - terpanos pentacíclicos: 9. - da classe dos hopanos (C27 a C34) 10. - da classe dos moretanos (C30) 11. - da classe dos 25 nor-hopanos (C27 a C33) 12. - gamacerano (C30) 13. esteranos (C27 a C29) 14. diasteranos (C27 a C28) 15. pregnanos (C21 a C22) 16. metil pregnanos (C22) 17. pregnanos aromáticos (C19 a C20). 16 classes de compostos na fração ácida (Ex, EHx, EDx) 18. ácidos lineares (C11 a C34) 19. ácidos lineares ramificados (C10 a C23) 20. ácidos pristanóico e fitanóico 21. ácido bicíclico (C16) 22. ácidos da classe dos labdanos (C19 a C21) 23. ácidos w-cicloexil alcanóico (C16 a C19)* 24. ácidos n-alquil-cicloexanóico (C16 a C20)* 25. ácidos n-alquil-metil-cicloexanóico (C15 a C23)* 26. ácidos n-alquil-dimetil-cicloexanóico (C16 a C24)* 27. ácidos tricíclicos do tipo queilantano (C21 -C24 - C26 ) 28. ácido 3,4-seco-lupanóico (C30) 29. ácido 3,4 seco-friedelanóico (C30) 30. ácidos hopanóicos ab (C30 a C33) 31. ácidos hopanóicos ba (C30 a C33) 32. ácidos hopanóicos bb (C30 a C33) 33. ácidos 25-nor-hopanóicos (C29 a C32) (* série de compostos inéditos).Abstract: The GC/MS biomarker analyses of eight oils from Albacora Field - Campos Basin(RJ), revealed that the acidic fossil molecules are sensitive to Geological Phenomena connected with the formations of the reservoirs. It was sugggested some years ago that the reservoirs in Albacora Field were mixtures of two oil pulses of different thermal evolution. This hypothesis was based on the study of hydrocarbon biomarkers. In our study we have first reinvestigated the neutral biomarkers to retrace the former hypothesis and then searched for more detaiIs through the study of other fossiI molecules, neutral and acidic. The analysis of the resconstructed ion chromatograms of the hopanoic acid methyl esters and their corresponding hydrocarbons (RIC m/z 191 e m/z 219) revealed different thermal evolution among the samples under analysis. Fatty acids were particularly helpful to detect a geochromatographical variation between well A and B. The fatty acids present in oil F had an even predominance which was taken as the first oil pulse characteristics. Coinjection of standard 2,2,6 - trimethyl - (3',7' - dimethyl-nonanyl)cyclohexane with oil D (acidic fraction derivatized to hydrocarbon) revealed the presence of these monocyclic acids (beta-carotene has been suggested as their precursors) as a minor homologous series and that the predominant homologous series of monocyclic acids are very similar to the standard but possessing a nonbranched lateral chain. We have detected 16 different classes of biomarkers in the hydrocarbon fractions obtained from the reduction of the acidic fossil molecules in the studied oils. A 8a(H) drimane synthetic standard was coinjected to oil H neutral fraction) thus confirming its presence in this oil. The presence in other oils was also inferred trom this experiment by comparison MS spectra and RI. Classes of compounds detected in the neutral fractions: linear hydrocarbons (C11 a C33), isoprenoid hidrocarbons (C19 a C22), n-alkyl cyclohexanes (C11 a C25) , methyl-n-alkyl-cyclohexanes (C12 a C25), bicyclic terpanes (drimanes) (C14 a C19), bicyclic terpanes (rearranjed drimanes, C14 a C16), tricyclic terpanes (queilantanes, C19 a C29), tetracyclic terpanes (C24), hopanes (C27 a C34), moretanes (C30), 25 nor-hopanos (C27 a C33), gammacerane (C30), esteranes (C27 a C29), diasteranes (C27 a C28). pregnanes (C21 a C22), metil pregnanos (C22). aromatic pregnanes (C19 a C20). Classes of compounds detected in the acidic fractions ( Ex, EHx, Edx): linear acids (C11 a C34), branched linear acids (C10 a C23), pristanoic and fitanoic acid, bicyclic acids (C16), labdanoic acids (C19 a C21), w-cyclohexyl alkanoic acids (C16 a C19)*, n-alkyl-cyclohexanoic acids (C16 a C20)*, n-alkyl-methyl-cyclohexanoic acids (C15 a C23)*, n-akyl-dimethyl-cyclohexanoic acids (C16 a C24)*, tricyclic terpanoic acids (queilantanes, C21 -C24 - C26 ), 3,4-seco-lupanoic acid (C30), 3,4-seco-friedelanoic acid (C30), hopanoic acids ( ab ) (C30 a C33), hopanoic acids (ba ) (C30 a C33) hopanoic acids bb (C30 a C33), 25-nor-hopanoic acids (C29 a C32). (* unpublished serie of compounds

  • Detalhes da historia geologica de Campo de Albacora - Bacia de Campos a partir de biomarcadores acidos
    Universidade Estadual de Campinas . Instituto de Quimica, 1996
    Co-Authors: Lidia Regina Nascimento
    Abstract:

    A análise por cromatografia gasosa acoplada a espectrometria de massas (GC/MS) de oito petróleos do Campo de Albacora - Bacia de Campos (RJ), através do estudo de biomarcadores ácidos evidenciaram a sensibilidade desta fração a fenômenos geológicos ocorridos durante o período de preenchimento dos reservatórios. Através de estudos multidisciplinares foi sugerido que os óleos dos reservatórios de Albacora são misturas de dois pulsos de óleos com diferente evolução térmica. Através da análise dos respectivos cromatogramas reconstruídos de íons dos ésteres metílicos e dos correspondentes hidrocarbonetos derivatizados dos ácidos hopanóicos, (RIC m/z 191 e m/z 219), pudemos destacar as diferenças na evolução térmica das amostras estudadas. Através da análise dos ácidos lineares pudemos detectar a ocorrência de geocromatografia entre dois poços (A e B) e principalmente reconhecer na distribuição dos ácidos lineares de cadeia longa do óleo F as características bastante preservadas do óleo gerado no primeiro pulso. Salientamos que estas observações só foram possíveis com o estudo das frações ácidas. A coinjeção do padrão 1-(3',7' dimetil-nonanil) 2,2,6 trimetil- cicloexano auxiliou na detecção da série que apresenta o fragmento característico m/z 125 e orientou na atribuição da cadeia lateral da série majoritária como sendo linear. Nosso estudo na fração ácida derivatizada a hidrocarbonetos de oito amostras de óleos de seis reservatórios resultou na identificação de 16 classes de compostos ácidos. Na fração neutra, estudada com intuito de obter parâmetros para comparação com a fração ácida derivatizada a hidrocarbonetos identificamos 17 classes de compostos normalmente identificados em petróleos. Foi confirmada pela coinjeção de padrões sintéticos com o óleo H a presença de 8a(H) drimano na fração neutra. A identificação deste composto nas outas amostras de óleo foi por comparação dos respectivos espectros e massas e índice de retenção. Relação dos compostos identificados neste trabalho: 17 classes de compostos na fracão neutra 1. hidrocarbonetos lineares (C11 a C33) 2. hidrocarbonetos isoprenóides (Pristano e Fitano) 3. n-alquil-cicloexano (C11 a C25) 4. metil-n-alquil-cicloexano (C12 a C25) 5. terpanos bicíclicos da classe dos drimanos (C14 a C19) 6. terpanos bicíclicos da classe dos drimanos rearranjados (C14 a C16) 7. terpanos tricíclicos do tipo queilantano (C19 a C29) 8. terpano tetracíclico (C24) - terpanos pentacíclicos: 9. - da classe dos hopanos (C27 a C34) 10. - da classe dos moretanos (C30) 11. - da classe dos 25 nor-hopanos (C27 a C33) 12. - gamacerano (C30) 13. esteranos (C27 a C29) 14. diasteranos (C27 a C28) 15. pregnanos (C21 a C22) 16. metil pregnanos (C22) 17. pregnanos aromáticos (C19 a C20). 16 classes de compostos na fração ácida (Ex, EHx, EDx) 18. ácidos lineares (C11 a C34) 19. ácidos lineares ramificados (C10 a C23) 20. ácidos pristanóico e fitanóico 21. ácido bicíclico (C16) 22. ácidos da classe dos labdanos (C19 a C21) 23. ácidos w-cicloexil alcanóico (C16 a C19)* 24. ácidos n-alquil-cicloexanóico (C16 a C20)* 25. ácidos n-alquil-metil-cicloexanóico (C15 a C23)* 26. ácidos n-alquil-dimetil-cicloexanóico (C16 a C24)* 27. ácidos tricíclicos do tipo queilantano (C21 -C24 - C26 ) 28. ácido 3,4-seco-lupanóico (C30) 29. ácido 3,4 seco-friedelanóico (C30) 30. ácidos hopanóicos ab (C30 a C33) 31. ácidos hopanóicos ba (C30 a C33) 32. ácidos hopanóicos bb (C30 a C33) 33. ácidos 25-nor-hopanóicos (C29 a C32) (* série de compostos inéditos).The GC/MS biomarker analyses of eight oils from Albacora Field - Campos Basin(RJ), revealed that the acidic fossil molecules are sensitive to Geological Phenomena connected with the formations of the reservoirs. It was sugggested some years ago that the reservoirs in Albacora Field were mixtures of two oil pulses of different thermal evolution. This hypothesis was based on the study of hydrocarbon biomarkers. In our study we have first reinvestigated the neutral biomarkers to retrace the former hypothesis and then searched for more detaiIs through the study of other fossiI molecules, neutral and acidic. The analysis of the resconstructed ion chromatograms of the hopanoic acid methyl esters and their corresponding hydrocarbons (RIC m/z 191 e m/z 219) revealed different thermal evolution among the samples under analysis. Fatty acids were particularly helpful to detect a geochromatographical variation between well A and B. The fatty acids present in oil F had an even predominance which was taken as the first oil pulse characteristics. Coinjection of standard 2,2,6 - trimethyl - (3',7' - dimethyl-nonanyl)cyclohexane with oil D (acidic fraction derivatized to hydrocarbon) revealed the presence of these monocyclic acids (beta-carotene has been suggested as their precursors) as a minor homologous series and that the predominant homologous series of monocyclic acids are very similar to the standard but possessing a nonbranched lateral chain. We have detected 16 different classes of biomarkers in the hydrocarbon fractions obtained from the reduction of the acidic fossil molecules in the studied oils. A 8a(H) drimane synthetic standard was coinjected to oil H neutral fraction) thus confirming its presence in this oil. The presence in other oils was also inferred trom this experiment by comparison MS spectra and RI. Classes of compounds detected in the neutral fractions: linear hydrocarbons (C11 a C33), isoprenoid hidrocarbons (C19 a C22), n-alkyl cyclohexanes (C11 a C25) , methyl-n-alkyl-cyclohexanes (C12 a C25), bicyclic terpanes (drimanes) (C14 a C19), bicyclic terpanes (rearranjed drimanes, C14 a C16), tricyclic terpanes (queilantanes, C19 a C29), tetracyclic terpanes (C24), hopanes (C27 a C34), moretanes (C30), 25 nor-hopanos (C27 a C33), gammacerane (C30), esteranes (C27 a C29), diasteranes (C27 a C28). pregnanes (C21 a C22), metil pregnanos (C22). aromatic pregnanes (C19 a C20). Classes of compounds detected in the acidic fractions ( Ex, EHx, Edx): linear acids (C11 a C34), branched linear acids (C10 a C23), pristanoic and fitanoic acid, bicyclic acids (C16), labdanoic acids (C19 a C21), w-cyclohexyl alkanoic acids (C16 a C19)*, n-alkyl-cyclohexanoic acids (C16 a C20)*, n-alkyl-methyl-cyclohexanoic acids (C15 a C23)*, n-akyl-dimethyl-cyclohexanoic acids (C16 a C24)*, tricyclic terpanoic acids (queilantanes, C21 -C24 - C26 ), 3,4-seco-lupanoic acid (C30), 3,4-seco-friedelanoic acid (C30), hopanoic acids ( ab ) (C30 a C33), hopanoic acids (ba ) (C30 a C33) hopanoic acids bb (C30 a C33), 25-nor-hopanoic acids (C29 a C32). (* unpublished serie of compounds

Akira Asada - One of the best experts on this subject based on the ideXlab platform.

  • seafloor geodetic constraints on interplate coupling of the nankai trough megathrust zone
    Nature, 2016
    Co-Authors: Yusuke Yokota, Tadashi Ishikawa, Shunichi Watanabe, Toshiharu Tashiro, Akira Asada
    Abstract:

    Seafloor geodetic data from the Nankai Trough, off southwestern Japan, show that most offshore sites in this earthquake-prone region have high slip-deficit rates, revealing previously unknown locations that could be important for the mitigation of future earthquake- and tsunami-associated disasters. Yusuke Yokota et al. have used seafloor geodetic observations to visualize the seismogenic zone along the Nankai Trough off southwestern Japan, which is thought to be one of the most dangerous megathrust zones in the world. They suggest that most offshore sites in this region have positive slip-deficit rates, revealing previously unknown locations that could be potential sources of future earthquakes and tsunamis. Low slip-deficit rates are observed in other regions, consistent with distributions of shallow slow earthquakes and subducting seamounts. Interplate megathrust earthquakes have inflicted catastrophic damage on human society. Such an earthquake is predicted to occur in the near future along the Nankai Trough off southwestern Japan—an economically active and densely populated area in which megathrust earthquakes have already occurred1,2,3,4,5. Megathrust earthquakes are the result of a plate-subduction mechanism and occur at slip-deficit regions (also known as ‘coupling’ regions)6,7, where friction prevents plates from slipping against each other and the accumulated energy is eventually released forcefully. Many studies have attempted to capture distributions of slip-deficit rates (SDRs) in order to predict earthquakes8,9,10. However, these studies could not obtain a complete view of the earthquake source region, because they had no seafloor geodetic data. The Hydrographic and Oceanographic Department of the Japan Coast Guard (JHOD) has been developing a precise and sustainable seafloor geodetic observation network11 in this subduction zone to obtain information related to offshore SDRs. Here, we present seafloor geodetic observation data and an offshore interplate SDR-distribution model. Our data suggest that most offshore regions in this subduction zone have positive SDRs. Specifically, our observations indicate previously unknown regions of high SDR that will be important for tsunami disaster mitigation, and regions of low SDR that are consistent with distributions of shallow slow earthquakes and subducting seamounts. This is the first direct evidence that coupling conditions might be related to these seismological and Geological Phenomena. Our findings provide information for inferring megathrust earthquake scenarios and interpreting research on the Nankai Trough subduction zone.

Yusuke Yokota - One of the best experts on this subject based on the ideXlab platform.

  • seafloor geodetic constraints on interplate coupling of the nankai trough megathrust zone
    Nature, 2016
    Co-Authors: Yusuke Yokota, Tadashi Ishikawa, Shunichi Watanabe, Toshiharu Tashiro, Akira Asada
    Abstract:

    Seafloor geodetic data from the Nankai Trough, off southwestern Japan, show that most offshore sites in this earthquake-prone region have high slip-deficit rates, revealing previously unknown locations that could be important for the mitigation of future earthquake- and tsunami-associated disasters. Yusuke Yokota et al. have used seafloor geodetic observations to visualize the seismogenic zone along the Nankai Trough off southwestern Japan, which is thought to be one of the most dangerous megathrust zones in the world. They suggest that most offshore sites in this region have positive slip-deficit rates, revealing previously unknown locations that could be potential sources of future earthquakes and tsunamis. Low slip-deficit rates are observed in other regions, consistent with distributions of shallow slow earthquakes and subducting seamounts. Interplate megathrust earthquakes have inflicted catastrophic damage on human society. Such an earthquake is predicted to occur in the near future along the Nankai Trough off southwestern Japan—an economically active and densely populated area in which megathrust earthquakes have already occurred1,2,3,4,5. Megathrust earthquakes are the result of a plate-subduction mechanism and occur at slip-deficit regions (also known as ‘coupling’ regions)6,7, where friction prevents plates from slipping against each other and the accumulated energy is eventually released forcefully. Many studies have attempted to capture distributions of slip-deficit rates (SDRs) in order to predict earthquakes8,9,10. However, these studies could not obtain a complete view of the earthquake source region, because they had no seafloor geodetic data. The Hydrographic and Oceanographic Department of the Japan Coast Guard (JHOD) has been developing a precise and sustainable seafloor geodetic observation network11 in this subduction zone to obtain information related to offshore SDRs. Here, we present seafloor geodetic observation data and an offshore interplate SDR-distribution model. Our data suggest that most offshore regions in this subduction zone have positive SDRs. Specifically, our observations indicate previously unknown regions of high SDR that will be important for tsunami disaster mitigation, and regions of low SDR that are consistent with distributions of shallow slow earthquakes and subducting seamounts. This is the first direct evidence that coupling conditions might be related to these seismological and Geological Phenomena. Our findings provide information for inferring megathrust earthquake scenarios and interpreting research on the Nankai Trough subduction zone.

S Poedjoprajitno - One of the best experts on this subject based on the ideXlab platform.

  • quaternary Geological Phenomena in labuhan area pandeglang regency banten province
    Indonesian Journal on Geoscience, 2012
    Co-Authors: U Lumban M Batu, S Poedjoprajitno
    Abstract:

    DOI:  10.17014/ijog.v7i4.148 Geological features in Labuhan area were studied from the middle of October to the middle of November 2011 covering seventy days. Surface and subsurface data were obtained from interpretation of landsat images and shallow hand-auger boreholes. The Geological features are distinctly associated with active tectonics. The stratigraphy clearly indicates at least three phases of tectonic activities since the Late Miocene until Holocene. Tectonics of phase one occurred in the Late Miocene; phase two took place in the period from Pliocene to Late Pleistocene, while tectonics phase three is ongoing in the Holocene. Volcanic activity has intensified since the Early Pleistocene. The landsat images show an irregular outline of the northern coast line. This penomenon is interpreted to be the result of tectonic uplift. On the other hand, the southern coast is linear in plan which is interpreted to correlate with tectonic subsidence. Furthermore, stratigraphic correlation shows that depositional environment changed vertically due to a local subsidence. The northern researched area is occupied by Pleistocene volcanic eruption centres, whilst the younger ones tend to shift southward. This fact tends to indicate that the subduction zone moved southward slowly.

  • quaternary Geological Phenomena in labuhan area pandeglang regency banten province fenomena geologi kuarter daerah labuhan kabupaten pandeglang provinsi banten
    2012
    Co-Authors: S Poedjoprajitno
    Abstract:

    Geological features in Labuhan area were studied from the middle of October to the middle of November 2011 covering seventy days. Surface and subsurface data were obtained from interpretation of landsat images and shallow hand-auger boreholes. The Geological features are distinctly associated with active tectonics. The stratigraphy clearly indicates at least three phases of tectonic activities since the Late Miocene until Holocene. Tectonics of phase one occurred in the Late Miocene; phase two took place in the period from Pliocene to Late Pleistocene, while tectonics phase three is ongoing in the Holocene. Volcanic activity has intensified since the Early Pleistocene. The landsat images show an irregular outline of the northern coast line. This penomenon is interpreted to be the result of tectonic uplift. On the other hand, the southern coast is linear in plan which is interpreted to correlate with tectonic subsidence. Furthermore, stratigraphic correlation shows that depositional environment changed vertically due to a local subsidence. The northern researched area is occupied by Pleistocene volcanic eruption centres, whilst the younger ones tend to shift southward. This fact tends to indicate that the subduction zone moved southward slowly.

Toshiharu Tashiro - One of the best experts on this subject based on the ideXlab platform.

  • seafloor geodetic constraints on interplate coupling of the nankai trough megathrust zone
    Nature, 2016
    Co-Authors: Yusuke Yokota, Tadashi Ishikawa, Shunichi Watanabe, Toshiharu Tashiro, Akira Asada
    Abstract:

    Seafloor geodetic data from the Nankai Trough, off southwestern Japan, show that most offshore sites in this earthquake-prone region have high slip-deficit rates, revealing previously unknown locations that could be important for the mitigation of future earthquake- and tsunami-associated disasters. Yusuke Yokota et al. have used seafloor geodetic observations to visualize the seismogenic zone along the Nankai Trough off southwestern Japan, which is thought to be one of the most dangerous megathrust zones in the world. They suggest that most offshore sites in this region have positive slip-deficit rates, revealing previously unknown locations that could be potential sources of future earthquakes and tsunamis. Low slip-deficit rates are observed in other regions, consistent with distributions of shallow slow earthquakes and subducting seamounts. Interplate megathrust earthquakes have inflicted catastrophic damage on human society. Such an earthquake is predicted to occur in the near future along the Nankai Trough off southwestern Japan—an economically active and densely populated area in which megathrust earthquakes have already occurred1,2,3,4,5. Megathrust earthquakes are the result of a plate-subduction mechanism and occur at slip-deficit regions (also known as ‘coupling’ regions)6,7, where friction prevents plates from slipping against each other and the accumulated energy is eventually released forcefully. Many studies have attempted to capture distributions of slip-deficit rates (SDRs) in order to predict earthquakes8,9,10. However, these studies could not obtain a complete view of the earthquake source region, because they had no seafloor geodetic data. The Hydrographic and Oceanographic Department of the Japan Coast Guard (JHOD) has been developing a precise and sustainable seafloor geodetic observation network11 in this subduction zone to obtain information related to offshore SDRs. Here, we present seafloor geodetic observation data and an offshore interplate SDR-distribution model. Our data suggest that most offshore regions in this subduction zone have positive SDRs. Specifically, our observations indicate previously unknown regions of high SDR that will be important for tsunami disaster mitigation, and regions of low SDR that are consistent with distributions of shallow slow earthquakes and subducting seamounts. This is the first direct evidence that coupling conditions might be related to these seismological and Geological Phenomena. Our findings provide information for inferring megathrust earthquake scenarios and interpreting research on the Nankai Trough subduction zone.