Deposition, diagenetic and hydrothermal processes in the Aptian Pre-Salt lacustrine carbonate reservoirs of the northern Campos Basin, offshore Brazil

Lima, Bruno Eustáquio Moreira; Ros, Luiz Fernando De

doi:10.1016/j.sedgeo.2019.01.006

Cited by 131 publications

(81 citation statements)

References 67 publications

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“…The occurrence of calcite spherulites is also a characteristic feature of the South Atlantic alkaline lacustrine Pre‐Salt deposits, where they are typically associated with magnesian clays (e.g. Wright & Barnett, 2014, 2015; Saller et al ., 2016; Wright & Tosca, 2016; Herlinger Jr. et al ., 2017; Sabato Ceraldi & Green, 2017; Lima & De Ros, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The interest on continental carbonates has increased sharply through the past decade, in part due to the discovery of huge petroleum reserves in the lacustrine carbonates of the South Atlantic Pre‐Salt province offshore Brazil and west Africa (Carminatti et al ., 2008; Wright & Barnett, 2014, 2015; Sabato Ceraldi & Green, 2017; Saller et al ., 2016; Wright & Tosca, 2016; Herlinger Jr. et al ., 2017; Abelha & Petersohn, 2018; Lima & De Ros, 2019; Lima et al. , 2020; Wright & Barnett, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Calcretes and travertines from the Palaeocene Itaboraí Basin as evidence of the early evolution of the Southeastern Brazil Continental Rift

et al. 2020

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The Itabora ı Basin, located in Rio de Janeiro state, is the smallest segment of the Southeastern Brazil Continental Rift, and the first to open, during the Palaeocene. Numerous studies focused on its fossiliferous content, but few systematically approached its depositional and diagenetic processes and products. A detailed description of the basal sedimentary deposits that remained after nearly fifty years of exploitation for cement production allowed an interpretation of the initial tectono-sedimentary conditions responsible for the formation of the Basin. The macroscopic and petrographic description of outcrops and well core samples of the calcretes and travertines that correspond to the initial basin infill was integrated with stable isotope geochemistry. The calcretes were separated into different facies (powdery, nodular, massive, platy, laminated and brecciated), and classified according to morphogenetic stages. Their main microscopic features include nodules, contraction cracks, vadose pisoliths, rhizocretions, infiltrated clays, corroded grains, expanded micas and clay aggregates with bimasepic-plasmic microfabric. The travertines exhibit diverse forms of abiotic calcite crystal aggregates (plumose, lamellar to prismatic-radial, spherulitic) and a minor proportion of microbial microcrystalline precipitates (bacterial shrubs). Tectonically active periods, characterized by intense fault movements associated with humid climate, promoted hydrothermal activity, formation of travertines and modification of the alluvial deposits and calcrete facies by ascending fluids. During periods of tectonic stability under arid to semi-arid climate, the exposed alluvial and hydrothermal deposits were influenced by pedogenetic processes. Sulphide-rich carbonate hydrothermal breccias occur in the main fault zone at the southern border. The characterization of extremely active pedogenetic and hydrothermal processes during opening and early evolution of the Itabora ı Basin is essential to the understanding of the initial evolution of the Southeastern Brazil 477

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calcretes and travertines from the Palaeocene Itaboraí Basin as evidence of the early evolution of the Southeastern Brazil Continental Rift

et al. 2020

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“…The crystal-shrub limestones are characterized by multiple phases of calcite, dolomite and quartz cements sitting adjacent to and/or replacing the primary authigenic carbonates, as well as multiple phases of dissolution (Figure 2c;Chitale et al, 2015;Saller et al, 2016;Herlinger et al, 2017;Lima and De Ros, 2019;Souza et al, 2018;Farias et al, 2019). Saddle-dolomite, dawsonite, celestine, and barite occur locally, with dolomite being a major source of primary porosity occlusion (Herlinger et al, 2016;Souza et al, 2018;Farias et al, 2019).…”

Section: Crystal-shrub Faciesmentioning

confidence: 99%

“…We model only relatively simple diagenetic processes, even though diagenesis of the Pre-Salt lithologies is highly complex (Herlinger et al, 2017;Lima and De Ros, 2019). We limit cementation to a thickness of 100 µm, as in theory this can proceed to occlude all primary pore space.…”

Section: Limitations Of the Modelmentioning

confidence: 99%

Modelling the impact of depositional and diagenetic processes on reservoir properties of the crystal-shrub limestones in the ‘Pre-Salt’ Barra Velha Formation, Santos Basin, Brazil

Hosa

Wood

Corbett

et al. 2020

Marine and Petroleum Geology

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“…Seals are mainly formed by fine-grained sedimentary deposits that drape the volcanoes (6 in Figure 21). Late hydrothermalism can induce both secondary porosity and cementation (Vieira de Luca et al, 2017;Lima and De Ros, 2019).…”

Section: Petroleum Elements Of the Degradational Stagementioning

confidence: 99%

Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System and Implications for Geoenergy Exploration

Bischoff¹,

Nicol²,

Cole³

et al. 2019

Preprint

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Large volumes of magma emplaced and deposited within sedimentary basins can have an impact on their architectural style and geological evolution. Over the last decade, continuous improvement in techniques such as seismic volcano-stratigraphy and 3D seismic visualization of igneous rocks buried in sedimentary basins has helped increase knowledge about these “volcanic basins”. Here, we unravel the complete architecture of the Maahunui Volcanic System (MVS), a middle Miocene monogenetic volcanic field now buried in the offshore Canterbury Basin, South Island of New Zealand. We show the location, geometry, size, and stratigraphic relationships between 25 main intrusive, eruptive, and sedimentary architectural elements in a comprehensive volcano-stratigraphic framework that explains the evolution of the MVS from emplacement to complete burial. The plumbing system of the MVS comprises of seven main architectural elements, including saucer-shaped sills, dikes and sills swarms, minor stocks and laccoliths, and pre-eruptive strata deformed by intrusions. These endogenous elements occur in five distinctive plumbing-types, controlled by the emplacement depth, and by the geometric relationships between the intrusions and the enclosing strata. The exogenous volcanic architecture is defined by a combination of eruptive and associated sedimentary architectural elements, with minor and localized shallow intrusions. Characteristic volcano-types of the MVS are interpreted as the deep-water equivalents of crater and cone-type volcanoes. Crater-type volcanoes have eight main architectural elements (i.e. root zone, lower and upper diatreme, tephra ring, tephra plain, intra-crater cones, overspill wedge and tephra fallow carpet). Cone-type volcanoes have five main architectural elements (i.e. basal cone, central crater, tephra flank, cone apron and tephra fallout carpet). After volcanism has ceased, the process of degradation and burial of the volcanic edifices produces five main sedimentary architectural elements (i.e. inter-cone plains, epiclastic plumes, canyons and gullies, burial domes and seamount-edge fans). Understanding the relationships between these diverse architectural elements allow us to reconstruct the complete architecture of the MVS, and to recognize the main volcano-stratigraphic trends in the study area. The characterisation of architectural elements of the MVS can be applied to explore opportunities to find valuable geoenergy resources such as oil, gas and geothermal energy with buried and active monogenetic volcanic systems.

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Deposition, diagenetic and hydrothermal processes in the Aptian Pre-Salt lacustrine carbonate reservoirs of the northern Campos Basin, offshore Brazil

Cited by 131 publications

References 67 publications

Calcretes and travertines from the Palaeocene Itaboraí Basin as evidence of the early evolution of the Southeastern Brazil Continental Rift

Calcretes and travertines from the Palaeocene Itaboraí Basin as evidence of the early evolution of the Southeastern Brazil Continental Rift

Modelling the impact of depositional and diagenetic processes on reservoir properties of the crystal-shrub limestones in the ‘Pre-Salt’ Barra Velha Formation, Santos Basin, Brazil

Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System and Implications for Geoenergy Exploration

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