Papers by Guilherme Borsa
Sedimentary Provenance and U-Pb Detrital Zircon in the Mesozoic Record of the Parecis Basin, Rôndonia and Juruena Sub-Basins
Caracterização De Arenitos De Depósitos Efêmeros De Unidades Triássicas Na Região Do Gráben Arroio Moirão, RS: Potenciais Análogos De Reservatórios
O estudo de reservatórios de óleo e gás de ambientes continentais tem enfatizado, nas últimas déc... more O estudo de reservatórios de óleo e gás de ambientes continentais tem enfatizado, nas últimas décadas, os arenitos associados a modelos eólicos, aluviais, fluviais e deltaicos. Alguns estudos buscaram analisar a presença de reservatórios em modelos efêmeros, como depósitos de inunditos, fluviais efêmeros e de desaceleração de fluxos hiperpicnais em corpos de água rasa. Embora esses depósitos eventualmente possam constituir-se como reservatórios de óleo e gás, a literatura não tem dedicado estudos para entender sua arquitetura e heterogeneidade, resultando em dificuldades de reconhecimento e de explotação. Como compreender a heterogeneidade de tais depósitos sedimentares? Que depósitos efêmeros podem apresentar características de análogos de reservatórios de óleo e gás? O presente estudo visa analisar as unidades sedimentares triássicas que ocorrem como fragmentos isolados no Gráben Arroio Moirão (RS). O objetivo principal é a identificação de corpos arenosos que seriam potenciais modelos análogos de reservatórios de sistemas efêmeros. A metodologia consiste na aplicação de teorias de análise de heterogeneidade de fácies, estratigrafia de sequências e suas respectivas técnicas como: levantamento de perfis colunares, definições de sucessões e associações de fácies de modelos efêmeros. Além do uso de técnicas de petrografia, difratometria de raios X e microscopia eletrônica de varredura (MEV), visando à determinação e quantificação da porosidade. A integração dos dados é apresentada em termos de um modelo de variação lateral e vertical de fácies de depósitos efêmeros como análogos de reservatórios. Além disso, também se propõe o arcabouço estratigráfico por meio da correlação de superfícies e unidades-chave onde ocorrem esses análogos de reservatórios para fins de prospecção em outras áreas da bacia.In recent decades, oil and gas reservoirs’ studies in continental environments have emphasized aeolian, alluvial, fluvial and deltaic sandstones. Some studies have sought to analyze ephemeral depositional models, like inundite, fluvial ephemeral deposits and hyperpycnal flow desaceleration deposits in shallow water bodies as potential reservoir. Although these deposits may eventually be constituted as oil and gas reservoirs, the literature has not dedicated studies to understand its architecture and heterogeneity, resulting in difficulties for further recognition and exploitation. How to understand the heterogeneity of such sedimentary deposits? That ephemeral deposit may have similar characteristics of oil and gas reservoirs? This study aims to examine the sedimentary units that outcrop like isolated fragments of the Paraná Basin in the Arroio Moirão Graben (RS). The main objective is to identify sand bodies that would be potential analogue models of reservoirs ephemeral systems. The methodology consists of applying facies heterogeneity analysis theories and methods, stratigraphic sequences and their techniques as: columnar profiles, facies successions and associations of ephemeral sedimentary systems. Data from petrographic techniques, diffraction and X-ray scanning electron microscopy (SEM) in order to determine and quantify the porosity support interpretations and models. The integration of data is presented in terms of a lateral and vertical facies variation of ephemeral deposits as reservoirs analogues. The stratigraphic framework through the correlation surfaces and key units where proposed in order to define analogous reservoirs for mining purposes in other areas of the basin
O Gráben Moirão localiza-se próximo às localidades de Canguçu, Amaral Ferrador,Encruzilhada do Su... more O Gráben Moirão localiza-se próximo às localidades de Canguçu, Amaral Ferrador,Encruzilhada do Sul e Santana da Boa Vista. Possui 25 km de largura (eixo NW) e 45 km de comprimento (eixo NE), sendo limitado por falhas de orientação nordeste-sudoeste, que colocam em contato os litodemas do embasamento com as unidades gonduânicas da bacia do Paraná. Como identificar estruturas de deformação em sedimentos inconsolidados (EDSI) e associa-las a sismitos? Como utilizar sismitos como chave de correlação?
Deformação e variação composicional do manto terrestre: Uma abordagem geoquímica e estrutural
Journal of South American Earth Sciences, 2017
The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a ... more The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a relict sedimentary unit associated with the Triassic section of Paraná Basin, preserved over the Sul-Riograndense Shield. However, this graben is 150 km far from the Paraná Basin and has no clear stratigraphic correlation with the main Triassic outcropping area. Based on new sedimentological, paleontological and sequence stratigraphy analysis, we propose a sequence stratigraphy framework for the graben units and correlation with the Triassic section of Paraná Basin. The graben has a stacking of highfrequency sequences with fining upward trend, defined as flood units in a Terminal Splay model. The fossil content corresponds to the Hyperodapedon assemblage zone with Carnian age. These sequences are correlated with Candelária Sequence from Paraná Basin and represent a more proximal faciesassociation related with a source-area from the shield. The graben units are directly overlying the basement units and this surface registers an uplift that eroded the previous sedimentary record of Paraná basin followed by a Middle Triassic basinwide subsidence. The reactivation of inherited structures from the basement was related to the southern Gondwana orogeny in Middle to Late Triassic that controlled the deposition in the Arroio Moirão Graben.
The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a ... more The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a relict sedimentary unit associated with the Triassic section of Paraná Basin, preserved over the Sul-Riograndense Shield. However, this graben is 150 km far from the Paraná Basin and has no clear stratigraphic correlation with the main Triassic outcropping area. Based on new sedimentological, paleontological and sequence stratigraphy analysis, we propose a sequence stratigraphy framework for the graben units and correlation with the Triassic section of Paraná Basin. The graben has a stacking of high-frequency sequences with fining upward trend, defined as flood units in a Terminal Splay model. The fossil content corresponds to the Hyperodapedon assemblage zone with Carnian age. These sequences are correlated with Candelária Sequence from Paraná Basin and represent a more proximal facies-association related with a source-area from the shield. The graben units are directly overlying the basement units and this surface registers an uplift that eroded the previous sedimentary record of Paraná basin followed by a Middle Triassic basin wide subsidence. The reactivation of inherited structures from the basement was related to the southern Gondwana orogeny in Middle to Late Triassic that controlled the deposition in the Arroio Moirão Graben.
The Triassic belt preserved in Arroio Moirão Graben, southernmost Brazil: Depositional system, sequence stratigraphy and tectonics
Journal of South American Earth Sciences
The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a ... more The influence of Gondwana tectonics in the Triassic is registered in the Arroio Moirão Graben, a relict sedimentary unit associated with the Triassic section of Paraná Basin, preserved over the Sul-Rio-Grandense Shield. However, this graben is 150 km far from the Paraná Basin and has no clear stratigraphic correlation with the main Triassic outcropping area. Based on new sedimentological, paleon-tological and sequence stratigraphy analysis, we propose a sequence stratigraphy framework for the graben units and correlation with the Triassic section of Paraná Basin. The graben has a stacking of high-frequency sequences with fining upward trend, defined as flood units in a Terminal Splay model. The fossil content corresponds to the Hyperodapedon assemblage zone with Carnian age. These sequences are correlated with Candel aria Sequence from Paran a Basin and represent a more proximal facies association related with a source-area from the shield. The graben units are directly overlying th...
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Papers by Guilherme Borsa