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Publications (252)
The use of machine learning predictions and clustering techniques in the analysis of petrophysical data is gaining increasing importance, particularly in the study of successions known for their heterogeneity. This study aims to test the applicability of unsupervised learning, using the k-Means algorithm, for identifying lithostratigraphic units an...
We investigate the crustal architecture and structural domains of the Campos rifted margin in southeastern Brazil, focusing on rifting evolution and segmentation. Based on 2‐D and 3‐D seismic reflection interpretation and potential field modeling, our results reveal an along‐strike variability, in terms of margin architecture and magmatism, that se...
Skolithos piperock is prevalent in Cambrian shallow marine deposits but diminishes throughout the Paleozoic. This study reports an interval with Skolithos piperock from the upper Furnas Formation (Lower Devonian), offering insights into the paleoenvironmental interpretation of nearshore sandstones. The studied section comprises eight sedimentary fa...
A NEW DINOSAUR TRACKSITE FROM THE ARARIPE BASIN (BRAZIL) AND THE PUTATIVE EARLY PALEOZOIC AGE FOR THE MAURITI FORMATION
Pp 97-102 In: Louis H.Taylor, Robert G. Raynolds, and Spencer G. Lucas, eds., 2024, Vertebrate Paleoichnology: A Tribute to Martin Lockley. New Mexico Museum of Natural History and Science Bulletin.
Footprints in the Araripe Basi...
The Barra Velha Formation consists of lacustrine carbonate reservoirs that represent late syn-rift and post-rift phases of Santos Basin evolution. These Aptian complex Brazilian reservoirs exhibit karst features at various scales. Early studies focused primarily on hypokarst, but recently expanded to include epikarst / subaerial exposure or both. T...
The upper Aptian lower Codó Formation is an attractive stratigraphic unit within the Parnaíba and São Luís basins, northeastern Brazil, formed during the Western Gondwana breakup. Located in a large sag basin, the formation records a dynamic depositional history of marine-influenced deltaic, lacustrine, and sabkha environments. This sedimentary evo...
The Early Cretaceous geological record contains evidence of major and abrupt global environmental changes. Understanding the past water-column redox fluctuations and paleoenvironmental evolution of Early Cretaceous environments is, therefore, pivotal for a better comprehension of this period as a whole. In this sense, to investigate the processes t...
Detachment faults play a crucial role in accommodating crustal thinning and controlling basin architecture in
extensional tectonic settings. This study focuses on the characterization of extensional structures at the Necking
Domain of the central Campos Rifted Margin, southeast Brazil. Based on seismic reflection and magnetic data we
interpreted...
Fine-grained rocks have historically been interpreted as a product of the settling of fine fractions in low-energy environments.
However, recent studies have suggested that in these environments, more dynamic and complex processes
operate. These processes involve a much more diverse set of sedimentary processes than those previously
assumed. The li...
Final version available for download at:
https://authors.elsevier.com/c/1jOW93BkFSdo8h
We investigate the crustal architecture and structural domains of the Campos rifted margin in southeastern Brazil, focusing on rifting evolution and segmentation. Based on 2-D and 3-D seismic reflection interpretation and potential field modelling, our results reveal an along-strike variability, in terms of margin architecture and magmatism, that s...
Detachment faults play a crucial role in accommodating crustal thinning and controlling basin architecture in extensional tectonic settings. This study focuses on the characterization of a detachment system in the Necking Domain of the central Campos Rifted Margin, utilizing seismic and potential field data interpretation. Our results show the pres...
The Itararé Group constitutes an important record of the Late Paleozoic Ice Age (LPIA)
in southern Gondwana, with deposits associated with diverse depositional settings in shallow to
marginal glacial-marine and glacial-lacustrine environments. Most of the trace fossils from the
Itararé Group are represented by arthropod trackways and shallow invert...
The Taubaté Basin is a sedimentary basin of Paleogene age that is part of the “Continental
Rift of Southeast Brazil” derived from the evolution of the Brazilian continental margin [1]. The
sedimentary infill is composed of alluvial fan and braided river deposits (Resende Formation),
playa lake deposits (Tremembé Formation), and meandering river dep...
Trilobites inhabited most environments of Paleozoic seas, ranging from estuaries to
continental slopes, and were globally distributed. Although their functional morphology and
phylogenetic relations are established by well-preserved body fossils, the behavior of trilobites
has received less attention. Three well-known trace fossils are interpreted...
Despite their potential for providing important information for paleobiogeography, studies using ostracod assemblages compiled from global datasets have been scarce so far. In this study, the paleogeographic implications of the relationship between different ostracod assemblages are analyzed and discussed for the Albian and Cenomanian. We compiled...
Rochas microclásticas, ou seja, rochas constituídas majoritariamente por partículas < 0,062 mm, apesar de representarem grande parte do registro geológico sedimentar, ainda hoje, carecem de estudos detalhados, principalmente, os que buscam pormenorizar seus aspectos texturais, de difícil observação devido ao tamanho diminuto das partículas, e integ...
Over the past decade, considerable progress has been made in the understanding of non-marine carbonate rocks following the discovery of substantial oil reserves in the pre-salt region off the eastern coast of Brazil. The Lula's Fingers interval, situated at the top of the Barra Velha Formation, has been identified in gamma-ray log patterns as a cru...
O Complexo Deltaico do Rio Paraíba do Sul (CDRPS) é uma importante planície costeira cuja evolução deposicional é comumente explicada por meio de modelos de sistemas deltaicos, nos quais processos fluviais e marinhos rasos são alternadamente enfatizados como controles. Entretanto, os efeitos decorrentes de fases de queda do nível relativo do mar oc...
This study is centered on an in-depth investigation of the porosities within theBarra Velha Formation, located in the exploratory block of Gato do Mato (Fig.1). Our primary objective was to compute and compare porosity values employing a comprehensive set of well logs—RHOB, DT, NPHI, PEF, and NMR. The focus of our analysis lies in understanding the...
There are many regions that have limited studies on porosity, either due to lack of economic interest or acreage availability. This study aims to compare different methods for calculating porosity in the Gato do Mato Prospect, Santos Basin to help comprehend the porosity of the reservoirs in the region. The results were obtained using well data pro...
Paleosols are an under-utilized tool for paleoenvironmental and paleoclimatic reconstruction in Brazilian intracontinental basins. The Itapecuru Formation, from the Lower Cretaceous of the Parnaíba Basin, consists of a 600-m-thick succession of interbedded very fine-to-fine-grained sandstone, mudstone, and paleosols containing rich fossil assemblag...
There is wide recognition of lacustrine sediments as excellent archives of a basin's depositional history due to their high sensibility to environmental changes. Among them, microbial limestones are one of the most valuable tools for paleoenvironmental reconstruction, as the biological agents responsible for their genesis tend to respond to short-l...
Lakes can be classified as open, semi-closed, and closed based on the balance between accommodation space and sediment-water fill. Different lake types can coexist in adjacent basins and rapidly change throughout time from one type to another. Understanding the processes that result from shifts in a lake's hydrological properties can be challenging...
Trilobites inhabited all environments of Paleozoic seas, ranging from estuaries to continental slopes, and were globally distributed. Although their functional morphology and phylogenetic relations are established by well-preserved body fossils, the behavior of trilobites has received less attention. Three well-known trace fossils are interpreted t...
The discovery of significant oil reserves in the pre-salt region along the eastern coast of Brazil marks a significant milestone in hydrocarbon exploration and production, triggering extensive discussions on the origin and composition of non-marine carbonate rocks. Dolomitization and silicification have been identified as major processes responsibl...
Folhelhos constituem uma recente fronteira de estudos na Geologia Sedimentar, estimulada pelo novo panorama exploratório do Shale Gas, não obstante constituir-se no selante de muitos sistemas petrolíferos. Contudo, no Brasil a geração de gás natural associada a estudos de ordem paleontológica é inédita e fundamental para determinação das reais pote...
A post-rift Aptian magmatism is recorded in a 500-m-thick sequence of basalts interbedded with marls in the Bacalhau oil and gas field in Santos Basin, SE Brazil. This magmatic section is within the so-called pre-salt sequence of Santos Basin that comprises the major oil and gas reserves of Brazil. This is the first publication of systematic petrol...
Resumo: Folhelhos constituem uma recente fronteira de estudos na Geologia Sedimentar, estimulada pelo novo panorama exploratório do Shale Gas, não obstante constituir-se no selante de muitos sistemas petrolíferos. Contudo, no Brasil a geração de gás natural associada a estudos de ordem paleontológica é inédita e fundamental para determinação das re...
Considered important analogues of pre-salt reservoirs in hydrocarbon-producing basins throughout eastern Brazilian shore, the coquinas of the Morro do Chaves Formation (Barremian-Aptian of the Sergipe-Alagoas Basin) were studied in this work from a petrophysical standpoint using advanced characterization methods for cores recovered from four wells...
A boring core (UFRJ-2-LRJ-01-SE) from the Sergipe-Alagoas Basin, Brazil, is one of the best and most expanded sections of the late Albian–early Turonian age within South America and includes one of the few records of Oceanic Anoxic Event 2 (OAE 2) in the South Atlantic Ocean. The aim of this study is to revise the calcareous nannofossil biostratigr...
The Santos Basin, located in offshore southeast Brazil, is the site of several giant oilfields of the Pre-salt interval. The limestones from the Barra Velha Formation (Aptian in age) are complex, highly heterogeneous, and usually are associated with Mg-clays, being interpreted as deposited in an unusual alkaline lacustrine rift system that develope...
Branched, bush- or shrub-like crystals are some of the most striking components of carbonates facies from the Cretaceous South Atlantic Pre-salt carbonate reservoirs. Many different analogues have been proposed to help to understand them, including travertines, lacustrine mounds and alkaline lake deposits, among others. Interpretation and genesis o...
ABSTRACT
No registro icnológico continental das bacias cretácicas brasileiras, as pegadas fósseis são bem representadas, em especial nos depósitos fluviais e marinhos litorâneos. Quase sempre são reconhecidas a partir das feições morfológicas superficiais, as quais incluem dígitos, almofadas pedais, contorno, garras ou mesmo uma deformação sequenci...
Alguns ambientes terrestres de alta energia e de condições oxidantes, inibem a preservação de fósseis e o acúmulo de matéria orgânica, limitando as interpretações bioestratigráficas e paleoambientais. • A caracterização de pegadas de dinosauros amplia a compreensão da interpretação genética de estruturas de deformação e os cenários paleoambientais...
Bioclastic and siliciclastic deposits of the Morro do Chaves Formation, Early Cretaceous of the Sergipe-Alagoas Basin, northeastern Brazil, show depositional and diagenetic analogies with the Brazilian Pre-salt rift reservoirs. A detailed petrographic study carried out on 221 thin sections from four well-cores were used to define the stratigraphic...
The presence of microbialites in the hypersaline lagoons of Rio de Janeiro is especially important in the study of recent analogs of carbonate rocks with microbial origins, mostly after the discovery of giant petroleum reservoirs in the Brazilian pre-salt section and their similarities with stromatolites from Lagoa Salgada (Rio de Janeiro State). M...
Most recent published work aims to understand pre-salt carbonates interval development and depositional environment conditions. Previous contributions which debate about rift extension usually consist of regional analysis regarding the South Atlantic Ocean opening and keep the debate about syn-rift and sag stage limits. This work uses 3D seismic vo...
The Glossifungites ichnofacies can be a signature of allogenic processes that demark omission, exhumation, and ravinement or indicate autogenic processes impacting several depositional scenarios, such as incised valleys, submarine gullies and canyons, erosive shoreface, tidal channels, and dewatered muddy substrates. Comparatively, autogenic surfac...
The characterization of Mg-clays in rock samples (well P1) from the Barra Velha Formation (Early Cretaceous) allowed the establishment of mineral assemblages on the basis of their kerolite and Mg-smectite (stevensite and saponite) content. Kerolite-rich assemblages (A and B) rarely contain saponite. Assemblage B is composed of kerolite-stevensite m...
Resumo: A região nordeste do estado do Paraná ainda é pouco conhecida em seus aspectos paleontológicos e estratigráficos. Este trabalho enfocou afloramentos devonianos localizados em Arapoti e Piraí do Sul e buscou o reconhecimento das fácies sedimentares e a definição de tafofácies com a intenção de interpretação paleoambiental e de correlação est...
The class Tentaculitoidea is an extinct group composed of small carbonatic coniform-shaped invertebrates, distributed from Ordovician to Devonian. This group is more often recorded to the North Hemisphere, being less recorded to South Hemisphere deposits. This study aims (i) analyze the species found in Brazilian Devonian outcrops, in addition (ii)...
The northeastern region of the state of Paraná, Brazil, is still little known in
its paleontological and stratigraphic aspects. This work focused on Devonian outcrops located in Arapoti and Piraí do Sul and aimed at the recognition of sedimentary facies and the definition of taphofacies, with the intention of paleoenvironmental interpretation and s...
No registro icnológico continental das bacias cretácicas brasileiras, as pegadas fósseis são bem representadas, em especial nos
depósitos fluviais e marinhos litorâneos. Quase sempre são reconhecidas a partir das feições morfológicas superficiais, as quais
incluem dígitos, almofadas pedais, contorno, garras ou mesmo uma deformação sequenciada no pl...
The compositional and textural characterization of authigenic Mg-clays from the Barra Velha Formation (Early Cretaceous) samples (well P1) was performed. The Mg-clay mineral assemblage is comprised by Mg-smectite (stevensite and saponite) and kerolite. Based on clay fraction XRD data, was possible to establish four assemblages rich in kerolite (A a...
The coquinas are carbonate rocks with variable content of siliciclastics and have a complex porous framework that implies an issue for their characterization as reservoirs. Furthermore, these rocks are considered important reservoirs due to the giant accumulations in the Campos and Santos basins (Coqueiros and Itapema formations, respectively), inc...
The Aptian Crato Member of the Araripe Basin is a 50-m-thick succession of laminated limestones alternated with siliciclastic rocks. This unit has been receiving attention worldwide mainly because it is one of the most famous fossil Konservat-Lagerstätten, where were identified well-preserved paleofauna and paleoflora. Clay mineralogy and lithogeoc...
The Aptian Romualdo Formation in the Araripe Basin represents the establishment of an epeiric sea in the Brazilian Northeast during the Early Cretaceous. This unit is composed by a succession of limestones, shales, sandstones, and coquinas, which constitute shell beds near the top. This last interval strongly suggests a marine influence in the whol...
In Brazil, the study of carbonate rocks has become very important due to the discovery of oil reservoirs in the Pre-salt interval on
the east margin basins (Campos and Santos).The coquinas from Itapema Formation (Barremian/Aptian, Santos Basin) are carbonate
rocks interpreted as of lacustrine origin in the literature, and generally represent hetero...
We propose a workflow to evaluate 4D seismic signals around Water-Alternating-Gas (WAG) injection wells in a Brazilian pre-salt carbonate field. Using a carbonate rock physics modeling approach introduced previously, we forward model 4D seismic responses in the form of 4D attributes and compare these with attributes from expected 4D signals to quan...
The Lower Cretaceous Barra Velha (BVE) unit is the main reservoir in our area of study, which consists of heterogeneous carbonates beneath a thick salt layer. Pre-Salt wells have shown that underneath the BVE reservoir, there could be several non-reservoir rocks (e.g., microporous carbonates, shales, volcanics) embedded in different formations that...
By the Early Cretaceous, the Araripe Basin (Northeastern Brazil) is interpreted as having gone through a phase of tectonic quiescence, during which rates of sediment accumulation were mostly modulated by climatic variations. The Crato Member (Santana Formation, upper Aptian of Araripe Basin) consists of gray calciferous mudstone and parallel-strati...
Lamprophyres and phonolite intrusions were sampled in the so-called Pre-Salt sequence of well 1-BRSA-905-RJS in northern Santos Basin nearby the Cabo Frio Structural High in SE Brazil. These alkaline rocks indicate the existence of a strongly silica-undersaturated trend. However, fractional crystallization modeling as well as Sr-Nd-Pb-Hf isotope da...
Dados diretos de subsuperfície são ainda escassos na borda leste da Bacia do Paraná e perfis de poços são rotineiramente utilizados para interpretação litológica. Com base nisto, propõe-se um estudo integrado que objetiva a caracterização litológica e gamaespectométrica do testemunho do poço 2-TB-1-PR (Tibagi), amostrado continuamente da superfície...
A seção Sedimentar da chamada fase pós-rifte na bacia de Santos, Brasil, é constituída pelas formações Barra Velha e Ariri. A formação Barra Velha, composta essencialmente por carbonatos interpretados como microbiais e que é o principal reservatório para hidrocarbonetos no play pré-sal, é o objeto de pesquisa deste trabalho. Durante a tafrogenia cr...
The Santos Basin hosts several giant carbonate oilfields in the Pre-salt province and is one of the most important hydrocarbon discoveries in the past years. These carbonate reservoirs present exceptional reservoir quality with a challenging depositional and diagenetic history that produced complex and heterogeneous pore systems. As one of the most...
This paper presents new taxonomic reports and biostratigraphic inferences based on ostracods in the basal section of the cored well UFRJ-2-LRJ-01-SE, perforated in the Votorantim quarry, Sergipe-Alagoas Basin, Brazil. The studied material comprised 44 samples in the range 438.65 to 315.30 m, identifying 52 species of ostracods distributed in 31 gen...
The Morro do Chaves Formation is a hybrid sedimentary succession composed of shell beds interbedded with mudstones and sandstones deposited during the rifting process of the Gondwana in a complex lake rift system, forming one of the thickest coquina deposits around the world. Despite being deeply investigated over the last decades in outcrops, the...
The pore structure of many carbonate formations is known to be very complex and heterogeneous. Heterogeneity is manifested by the presence of different types, sizes, and shapes of pores resulting from sedimentation and diagenetic actions. These complexities greatly increase uncertainties in estimated rock hydraulic properties in that different perm...
[191107-012847]
Although fossil footprints are generally recognized by morphological data from autopodia, in some cases they can also be characterized by a sequential deformation of the substrate, since the footprint reaches many sedimentary levels beyond the surface. In such cases, these features are preserved as deformation structures which can b...
Este trabalho desenvolveu-se através dos resultados das análises petrográficas, químicas e litogeoquímicas do testemunho do poço 1UN30, perfurado na Bacia do Parnaíba. A petrografia aponta: a rocha ígnea como de textura glomeroporfirítica e mineralogia essencial de plagioclásio e piroxênio, com olivina e minerais opacos acessórios; o arenito como q...
All published chronostratigraphic charts of the Espírito Santo basin, Brazil, show stratigraphic frameworks based on second-order depositional sequences. The absence of published high-resolution biostratigraphic analyses precludes the proposition of a higher order stratigraphic framework. This work breaks down the second-order depositional sequence...
Corpos arenosos de plataforma, como os cordões arenosos (sand ridges), constituem um significativo tipo de reservatório em bacia de margem continental, o que chama atenção para que esses corpos possam ser melhores estudados e caracterizados. Esse trabalho, localizado na região centro-oeste da bacia do Espírito Santo, visa caracterizar esse tipo de...
This work analyzes the results of the SP2 core (50.30 m length) collected in the coastal plain of Sepetiba Bay (SB; SE Brazil), 2 km away from the Guandu River mouth (latitude 22° 55′S, longitude 43° 46′W). It aims to study the influence of the Holocene relative sea level (RSL) on the coastal plain of SB. After description, the SP2 core was sampled...
Coquinas constitute widespread deposits in lacustrine, estuarine, and shallow marine settings, where they are a valuable source of information on environmental conditions. Thick coquina successions were deposited in a series of lacustrine rift basins that formed along the Brazilian Continental Margin during the early stages of the opening of the So...
In the Parnaíba basin, northeastern Brazil, some records of basic tholeiitic magmatism have been recognized as part of large igneous provinces (LIP’s). They are represented by the Mosquito basaltic flows (Triassic–Jurassic; ca. 200 Ma) that occurs in the west portion of the basin as well as the Sardinha diabases (Cretaceous; ca. 124 Ma) eastwards....
Coquinas constituem importantes depósitos sedimentares bioclásticos em ambientes de sedimentação lacustre, estuarino e marinho raso. Seu estudo é de fundamental importância para geocientistas interessados em diversas temáticas, desde a reconstrução paleoambiental e paleoecológica dos organismos até sua relevância como rocha-reservatório de hidrocar...
A porção offshore da seção drifte da bacia do Espírito Santo é conhecida pela sua complexidade estratigráfica e estrutural relacionada, à tectônica salífera pós-breakup. A movimentação do sal deformou o registro sedimentar da fase drifte na Província de Domos de Sal, região sul da bacia, área de estudo desse trabalho. Nesta pesquisa foram delimitad...
