Presalt stratigraphy and depositional systems in the Kwanza Basin, offshore Angola

Saller, Arthur H.; Rushton, Shawn; Buambua, Lino; Inman, Kerry F.; McNeil, Ross; Dickson, J. A. D.

doi:10.1306/02111615216

Cited by 115 publications

(103 citation statements)

References 35 publications

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“…The SEM confirms the bladed aggregation/imbrication of rhombohedral polycrystals ( Figure 10E). Saller et al (2016) described Pre-Salt calcite shrubs as radiating bundles of fibrous-to-prismatic crystals. Within a shrub branch, upward oriented bundles of radiating crystals have clear growth interference; however, the fibrous, upward-oriented bundles abruptly finish at the edge of a branch, leaving open vugs between shrubby growths (Saller et al, 2016).…”

Section: Facies 4: Calcite Shrubmentioning

confidence: 99%

“…Saller et al (2016) described Pre-Salt calcite shrubs as radiating bundles of fibrous-to-prismatic crystals. Within a shrub branch, upward oriented bundles of radiating crystals have clear growth interference; however, the fibrous, upward-oriented bundles abruptly finish at the edge of a branch, leaving open vugs between shrubby growths (Saller et al, 2016). The shrubs seem to have grown upward and create positive relief (Saller et al, 2016).…”

Section: Facies 4: Calcite Shrubmentioning

confidence: 99%

“…Both mechanisms suggest a saline, alkaline environment, and high metal fluxes are required to emplace these large Ca-and Mg-dominated precipitate bodies. The "shrubby" spherulitic boundstones which generally form the best reservoir facies (Ceraldi and Green, 2016;Saller et al, 2016) are less well understood, and are generally assumed to be some local modification of the more common spherular growth-form. Recent examples of shrubby carbonate formation are hard to find, reflecting that the microenvironment in which these growthforms develop are not well represented in the modern Earth system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

What Causes Carbonates to Form “Shrubby” Morphologies? An Anthropocene Limestone Case Study

et al. 2019

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Section: Facies 4: Calcite Shrubmentioning

confidence: 99%

Section: Facies 4: Calcite Shrubmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

What Causes Carbonates to Form “Shrubby” Morphologies? An Anthropocene Limestone Case Study

et al. 2019

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“…The reason for the special attention are major hydrocarbon discoveries in lacustrine basins of the South Atlantic rift-sag on the Sao Paulo Plateau (Wright, 2013) and also offshore Angola (Greenhalgh et al, 2012, Saller et al, 2016. The major reservoirs in these areas turned out to be microbialites (Gomes et al, 2012) situated at a depth of 5 km, below ~2 km of salt and ~2kms of water depth.…”

Section: Introductionmentioning

confidence: 99%

Geobody architecture of continental carbonates: “Gazda” travertine quarry (Süttő, Gerecse Hills, Hungary)

Török

Mindszenty

Claes

et al. 2017

Quaternary International

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The Gazda quarry is one of the largest outcrops of the present-day Süttő travertine complex that is situated close to the town of Süttő (Hungary), in the Pannonian Basin. Sedimentological and petrographical analyses show that the Gazda travertine body is built out of phytohermal, wavy laminated, massive and flat laminated travertine lithofacies representing reed mound, slope, lacustrine and palustrine depositional environments, respectively. Based on petrographic analyses, the following three main textural features were recognized that allow to describe the most common microscopic features: (1) micrite textures; (2) micritic coatings and crusts; and (3) different types of clasts. Each major lithofacies is characterized by a particular association of these textural types.The geometry of the travertine beds follows the antecedent land-surface, a NE-SW striking prePleistocene valley. It is proposed that in this valley travertine precipitation took place along a gently sloping terrain. The Gazda travertine system was fed by at least two groundwatersprings. One of them was located NE of the quarry from which waters were flowing along the axis of the valley. The other source was located to the East of the Gazda quarry and waters joined the main water-course along the valley. Closest to the confluence, a phytohermal mound developed with lateral slope and eventual pond depositional systems. Onlapping and interfingering with the flat laminated lithofacies indicate alternating activity of the two springs.Fractures observed in the quarry are mainly related to postdepositional gravitational sliding, however, neotectonic forces resulting in SE-NW tension also played a role in the formation of the fractures. Detailed sedimentological and geochemical study of the Gazda travertine complex allowed small-scale facies characterization providing information about the ancient depositional environment and the heterogeneous nature of these carbonates.

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“…The latter processes influence the size and shape of pores, producing some of the most complex pore networks recorded in sedimentary rocks. Recent hydrocarbon discoveries highlighted the continental carbonate reservoir potential in the presalt exploration, offshore Brazil [2,3] and in the Namibe basin, Angola [4][5][6]. Quantitative data about lithofacies' occurrence, distributions, and their related porosity and permeability are key to understanding the reservoir behavior.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Simulations of Fluid Flow in Continental Carbonate Reservoir Rocks and in Upscaled Rock Models Generated with Multiple-Point Geostatistics

Soete

Claes

et al. 2017

Geofluids

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Microcomputed tomography ( CT) and Lattice Boltzmann Method (LBM) simulations were applied to continental carbonates to quantify fluid flow. Fluid flow characteristics in these complex carbonates with multiscale pore networks are unique and the applied method allows studying their heterogeneity and anisotropy. 3D pore network models were introduced to single-phase flow simulations in Palabos, a software tool for particle-based modelling of classic computational fluid dynamics. In addition, permeability simulations were also performed on rock models generated with multiple-point geostatistics (MPS). This allowed assessing the applicability of MPS in upscaling high-resolution porosity patterns into large rock models that exceed the volume limitations of the CT. Porosity and tortuosity control fluid flow in these porous media. Micro-and mesopores influence flow properties at larger scales in continental carbonates. Upscaling with MPS is therefore necessary to overcome volume-resolution problems of CT scanning equipment. The presented LBM-MPS workflow is applicable to other lithologies, comprising different pore types, shapes, and pore networks altogether. The lack of straightforward porosity-permeability relationships in complex carbonates highlights the necessity for a 3D approach. 3D fluid flow studies provide the best understanding of flow through porous media, which is of crucial importance in reservoir modelling.

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Presalt stratigraphy and depositional systems in the Kwanza Basin, offshore Angola

Cited by 115 publications

References 35 publications

What Causes Carbonates to Form “Shrubby” Morphologies? An Anthropocene Limestone Case Study

What Causes Carbonates to Form “Shrubby” Morphologies? An Anthropocene Limestone Case Study

Geobody architecture of continental carbonates: “Gazda” travertine quarry (Süttő, Gerecse Hills, Hungary)

Lattice Boltzmann Simulations of Fluid Flow in Continental Carbonate Reservoir Rocks and in Upscaled Rock Models Generated with Multiple-Point Geostatistics

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