An incomplete correlation between pre-salt topography, top reservoir erosion, and salt deformation in deep-water Santos Basin (SE Brazil)

Alves, Tiago Marcos; Fetter, Marcos; Lima, C.; Cartwright, Joseph Albert; Cosgrove, John; Ganga, Adriana de Oliveira; Queiroz, Cláudia; Strugale, Michael

doi:10.1016/j.marpetgeo.2016.10.015

Cited by 50 publications

(43 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LW and BW refer to landward‐ and basinward‐dipping base‐salt ramps, respectively. The black polygon in (a) corresponds to the location of the depth base‐salt structure map adapted from Alves et al () shown in (c) for comparison…”

Section: Methodsmentioning

confidence: 99%

“…During the late Aptian, fault activity ceased on the SPP and a thick (up to 2.6 km) salt layer was deposited (Figure ) (Davison et al, ). Although salt deposition occurred after active faulting (i.e., it is locally post‐rift), relief inherited from the preceding rift phase controlled salt thickness variations; i.e., salt was thin across rift‐related footwall highs and thick in intervening hanging wall depocentres (Figure ) (Alves et al, ; Davison et al, ; Pichel et al, ; Rodriguez, Jackson, Rotevatn, Bell, & Francis, ).…”

Section: Tectono‐stratigraphic Frameworkmentioning

confidence: 99%

“…The base of salt is typically undeformed, although it is locally offset by a few relatively small (up to 100 ms TWT or c. 450 m of throw) faults. Where closely spaced, the cumulative throw across these faults controls the development of base‐salt ramps and monoclinal geometries at the edge of the largest pre‐salt highs (Figure ) (Alves et al, ; Davison et al, ; Rodriguez et al, ). This indicates that pre‐salt structures and related topography were present before and during salt deposition, with only minor, reduced fault activity during (or after) salt deposition (Davison et al, ).…”

Section: Pre‐salt Structuresmentioning

confidence: 99%

“…It is located at the present‐day toe‐of‐slope, between the somewhat enigmatic and controversial Albian Gap (see below), and a c. 30 km wide salt nappe developed at the downdip end of the basin (Davison et al, ; Jackson, Jackson, Hudec, & Rodriguez, ; Quirk et al, ) (Figure c,d). The deep structure of the SPP is defined bysignificant base‐salt relief related to a Jurassic‐to‐Cretaceous rift event that defined the early evolution of the margin (Figures d and ) (Alves et al, ; Davison et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Two end‐member models have been proposed. The first model states that post‐Albian deformation on the SPP was largely driven by regional shortening linked to coeval updip extension (Alves et al, ; Fiduk & Rowan, ; Guerra & Underhill, ; Quirk et al, ). This extension was accommodated by slip on the Cabo Frio Fault, a large landward‐dipping, salt‐detached normal listric fault bounding the downdip margin of the 50–60 km wide Albian Gap and its overlying rollover (Figure c,d) (Jackson, Jackson, Hudec, & Rodriguez, , their fig.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Base‐salt relief controls salt‐tectonic structural style, São Paulo Plateau, Santos Basin, Brazil

et al. 2019

View full text Add to dashboard Cite

Base-salt relief influences salt flow, producing three-dimensionally complex strains and multiphase deformation within the salt and its overburden. Understanding how base-salt relief influences salt-related deformation is important to correctly interpret salt basin kinematics and distribution of structural domains, which have important implications to understand the development of key petroleum system elements. The São Paulo Plateau, Santos Basin, Brazil is characterized by a >2 km thick, mechanically layered Aptian salt layer deposited above prominent base-salt relief. We use 3D seismic reflection data, and physical and conceptual kinematic models to investigate how gravity-driven translation above thick salt, underlain by complex base-salt relief, generated a complex framework of salt structures and minibasins. We show that ramp-syncline basins developed above and downdip of the main pre-salt highs record c. 30 km of Late Cretaceous-Paleocene basinward translation. As salt and overburden translated downdip, salt flux variations caused by the base-salt relief resulted in non-uniform motion of the cover, and the simultaneous development of extensional and contractional structures. Contraction preferentially occurred where salt flow locally decelerated, above landward-dipping base-salt and downdip of basinward-dipping ramps. Extension occurred at the top of basinward-dipping ramps and base-salt plateaus, where salt flow locally accelerated. Where the base of the salt layer was broadly flat, structures evolved primarily by load-driven passive diapirism. At the edge of or around smaller base-salt highs, salt structures were affected by plan-view rotation, shearing and divergent flow. The magnitude of translation (c. 30 km) and the style of salt-related deformation observed on the São Paulo Plateau afford an improved kinematic model for the enigmatic Albian Gap, suggesting this structure formed by a combination of basinward salt expulsion and regional extension. These observations contribute to the long-lived debate regarding the mechanisms of salt tectonics on the São Paulo Plateau, ultimately improving our general understanding of the effects of base-salt relief on salt tectonics in other basins. K E Y W O R D S base-salt relief, Brazil, diapirism, gravity-driven deformation, minibasins, ramp-syncline basins, salt tectonics, Santos Basin, São Paulo Plateau, translation 454 | EAGE PICHEL Et aL. 456 | EAGE PICHEL Et aL. | 457 EAGE PICHEL Et aL.FIGURE 3 Static-corrected base-salt (BoS) structure map illustrating the main base-salt highs and associated ramps in (a), and overlay of different structural domains of the SPP and location of sections presented in this study in (b). LW and BW refer to landward-and basinwarddipping base-salt ramps, respectively. The black polygon in (a) corresponds to the location of the depth base-salt structure map adapted from Alves et al. (2017) shown in (c) for comparison 458 | EAGE PICHEL Et aL. F I G U R E 4 (a) TWT top-salt structure map showing the framework of salt walls and minibasi...

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Tectono‐stratigraphic Frameworkmentioning

confidence: 99%

Section: Pre‐salt Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Base‐salt relief controls salt‐tectonic structural style, São Paulo Plateau, Santos Basin, Brazil

et al. 2019

View full text Add to dashboard Cite

show abstract

Relating differential crustal architecture to passive margin evolution: A case study from the Colatina Fracture Zone (SE Brazil) using apatite fission‐track thermochronology

Costa,

Fonseca,

de Grave

et al. 2024

Geological Journal

View full text Add to dashboard Cite

The Colatina Fracture Zone (CFZ) defines a distinct NNW–SSE‐oriented linear zone of fractures and brittle faults that represents an inherited weak zone in the current crustal structure of the (Pre)Cambrian Araçuaí Orogen. In the Early Cretaceous, the CFZ was reactivated during rifting of West Gondwana and subsequent opening of the South Atlantic Ocean, as evidenced by the emplacement of dykes along its structural network and the development of major depocentres of the Campos Basin in the offshore segments of the CFZ. Previous thermochronological studies have demonstrated that the CFZ was also rejuvenated during the drift phase of the South Atlantic. However, a number of questions regarding differential surface uplift and basement exhumation between the CFZ and its surrounding areas, such as the Doce River Valley (DRV), are still unresolved. In this study, we aim to investigate the CFZ as a distinctive structure in the tectonic rejuvenation of the passive margin of south‐east Brazil. Samples from the CFZ and the DRV were collected for apatite fission‐track (AFT) analyses. In the DRV, samples yield AFT central ages from 87 to 97 Ma with mean track lengths (MTL) from 12.6 to 13.3 μm. In contrast, in the CFZ, AFT central ages from 70 to 83 Ma with MTL values from 13.2 and 13.4 μm are obtained. The correlation between AFT age and elevation suggests that the tectonic development of these regions was markedly different and uncoupled. The thermal history models from the AFT data further constrain this differential evolution. On the one hand, thermal history modelling for the DRV indicates a slower and protracted cooling since the incipient Atlantic rifting in the Early Cretaceous. On the other hand, the models for CFZ reveal a rapid cooling phase between the Late Cretaceous to the Palaeocene. In the DRV, the observed basement cooling was most probably triggered by erosion of the uplifted rift shoulder generated by Gondwana break‐up. The more recent, Late Cretaceous–Palaeocene rock cooling, localized in the CFZ, was synchronous with a major phase of the Andean orogeny. This suggests that reactivations and erosional exhumation of the CFZ basement could be a consequence of far‐field propagation of intraplate compressional stress. The higher susceptibility of the CFZ to reactivating over its surroundings shows that structural inheritance is a key factor in the differential tectonic evolution of passive margins. Further research on the Late Cretaceous–Palaeocene reactivation in the CFZ's offshore extension may be crucial for the exploitation of hydrocarbons in the Campos and Espírito Santos basins.

show abstract

Complex lithology prediction using mean impact value, particle swarm optimization, and probabilistic neural network techniques

Zhang

et al. 2020

Acta Geophys.

View full text Add to dashboard Cite

An incomplete correlation between pre-salt topography, top reservoir erosion, and salt deformation in deep-water Santos Basin (SE Brazil)

Cited by 50 publications

References 39 publications

Base‐salt relief controls salt‐tectonic structural style, São Paulo Plateau, Santos Basin, Brazil

Base‐salt relief controls salt‐tectonic structural style, São Paulo Plateau, Santos Basin, Brazil

Relating differential crustal architecture to passive margin evolution: A case study from the Colatina Fracture Zone (SE Brazil) using apatite fission‐track thermochronology

Complex lithology prediction using mean impact value, particle swarm optimization, and probabilistic neural network techniques

Contact Info

Product

Resources

About