scholarly journals Interplay between base‐salt relief, progradational sediment loading and salt tectonics in the Nordkapp Basin, Barents Sea – Part II

2021 ◽  
Author(s):  
Muhammad Hassaan ◽  
Jan Inge Faleide ◽  
Roy Helge Gabrielsen ◽  
Filippos Tsikalas ◽  
Silje Grimstad
Keyword(s):  
Barents Sea ◽  
Salt Tectonics ◽  
Sediment Loading ◽  
Base Salt

scholarly journals Pre-salt rift morphology controls salt tectonics in the Campos Basin, offshore SE Brazil

2021 ◽  
Author(s):  
Francyne B. Amarante ◽  
Christopher A-L. Jackson ◽  
Leonardo M. Pichel ◽  
Claiton M. S. Scherer ◽  
Juliano Kuchle
Keyword(s):  
Hydrocarbon Exploration ◽  
Passive Margin ◽  
Salt Tectonics ◽  
Borehole Data ◽  
Temporal And Spatial Distribution ◽  
South Central ◽  
Campos Basin ◽  
Se Brazil ◽  
Gravity Driven ◽  
Base Salt

<p>Salt-bearing passive margin basins offshore SE Brazil have been and remain attractive for hydrocarbon exploration and production. In the Campos Basin, major reservoir types include post-salt turbidites, which are located in structural traps related to thin-skinned faulting above salt anticlines and rollers. Classic models of gravity-driven salt tectonics commonly depict kinematically linked zones of deformation, characterised by updip extension and downdip contraction, separated by a weakly deformed zone associated with downdip translation above a relatively smooth base-salt surface. We use 2D and 3D seismic reflection and borehole data from the south-central Campos Basin to show that this does not adequately capture the styles of salt-detached gravity-driven deformation above relict, rift-related relief. The base-salt surface is composed of elongated, broadly seaward-dipping ramps with structural relief reaching c. 2 km. These ramps define the boundary between the External High and the External Low, basement structures related to the rift tectonics. Local deformation associated with the base-salt ramps can overprint and/or influence regional, margin-scale patterns of deformation producing kinematically-variable and multiphase salt deformation. We define three domains of thin-skinned deformation: an updip extensional domain, subdivided into subdomains E1 and E2, an intermediate multiphase domain and a downdip contractional domain. The multiphase domain is composed of three types of salt structures with a hybrid extensional-contractional origin and evolution. These are: (i) contractional anticlines that were subjected to later extension and normal faulting; (ii) diapirs with passive and active growth later subjected to regional extension, developing landward-dipping normal faults on the landward flank; and, lastly, (iii) an extensional diapir that was subsequently squeezed. We argue that this multiphase style of deformation occurs as a consequence of base-salt geometry and relief creating local variations of salt flow that localize extension at the top and along the ramps, and contraction at the base. Translation and extension of salt and its overburden across major base-salt ramps resulted in three ramp syncline basins northeast of the study area, partially bounded by salt-detached listric faults. The temporal and spatial distribution and evolution of these and other key salt and overburden structures, and their relationship to base-salt relief, suggest 30 to 60 km of horizontal gravity-driven translation of salt and overburden.</p>

scholarly journals The influence of base-salt relief, rift topography and regional events on salt tectonics offshore Morocco

2019 ◽  
Vol 103 ◽  
pp. 87-113 ◽  
Author(s):  
Leonardo M. Pichel ◽  
Mads Huuse ◽  
Jonathan Redfern ◽  
Emma Finch
Keyword(s):  
Salt Tectonics ◽  
Base Salt

Salt tectonics driven by differential sediment loading: stability analysis and finite-element experiments

2004 ◽  
Vol 16 (2) ◽  
pp. 199-218 ◽  
Author(s):  
Lykke Gemmer ◽  
Steven J. Ings ◽  
Sergei Medvedev ◽  
Christopher Beaumont
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Salt Tectonics ◽  
Sediment Loading

scholarly journals Analogue modelling of the interplay between gravity gliding and spreading across complex rift topography in the Santos Basin

2021 ◽  
Author(s):  
Leonardo Pichel ◽  
Oriol Ferrer ◽  
Christopher Jackson ◽  
Eduard Roca
Keyword(s):  
Physical Modelling ◽  
Sao Paulo ◽  
Salt Tectonics ◽  
São Paulo ◽  
Lateral Deformation ◽  
New Concepts ◽  
Gravity Driven ◽  
Competing Hypotheses ◽  
Base Salt ◽  
Structural High

The Santos Basin presents a complex and controversial evolution and distribution of salt tectonics domains. The controversies revolve mainly around the kinematically- linked Albian Gap and São Paulo Plateau. The Albian Gap is a ~450 km long and 60 km wide feature characterized by a post-Albian counter-regional rollover overlying depleted Aptian salt and in which the Albian is absent. The São Paulo Plateau is defined by a pre-salt structural high with significant base-salt topography and overlain by ~2.5 km thick salt. Another prominent feature is the Merluza Graben, a rift depocentre that underlies the southern portion of the Albian Gap and displays significant (3-4 km) of base-salt relief. Two competing hypotheses have been proposed to explain the origin and kinematics of these provinces. One invokes post- Albian extension within the Albian Gap and contraction in the Sao Paulo Plateau. The other invokes post-Albian salt expulsion in the Albian Gap and salt inflation in the São Paulo Plateau without significant lateral deformation. A recent study shows these processes contribute equally to the evolution of these domains, also demonstrating the importance of the previously neglected base-salt relief. We apply 3D physical modelling to test these new concepts and understand the interplay between laterally- variable base-salt relief, gliding and spreading on salt tectonics. Our results show a remarkably-similar salt and post-salt evolution and architecture to the Santos Basin as proposed in recent studies. They improve the understanding on the distribution and interaction of salt-related structural styles and gravity-driven processes, being also applicable to other salt-bearing margins.

scholarly journals The influence of base-salt relief, rift topography and regional events on salt tectonics offshore Morocco

2019 ◽  
Author(s):  
Leonardo Pichel ◽  
Mads Huuse ◽  
Jonathan Redfern ◽  
Emma Finch
Keyword(s):  
Salt Tectonics ◽  
Base Salt

Relationship between salt and crustal tectonics in the Sørvestsnaget Basin, SW Barents Sea

2020 ◽  
Author(s):  
Gaia Travan ◽  
Benjamin Bellwald ◽  
Sverre Planke ◽  
Virginie Gaullier ◽  
Dwarika Maharjan ◽  
...  
Keyword(s):  
Seismic Data ◽  
Potential Field ◽  
Field Data ◽  
Barents Sea ◽  
Hydrocarbon Exploration ◽  
Salt Tectonics ◽  
Potential Field Data ◽  
The Barents Sea ◽  
Western Side ◽  
Seismic Anomalies

<p>The geology of the Barents Sea has been widely studied because of the interest for hydrocarbon exploration. Our study focuses on the SW Barents Sea, on the western side of the Senja Ridge in the Sørvestsnagets Basin, which is still a less deciphered area. Located at the limit of the continental shelf, this deep Cretaceous basin is characterized by a several-kilometer-thick sequence of Cenozoic sediments locally influenced by salt structures. Because of the peculiar rheological characteristics of salt, the deposition of evaporites during Permo-Carboniferous times still represents a key aspect to deeply understand the geological setting because salt tectonics considerably affects the brittle sedimentary cover.</p><p>5,500 km<sup>2</sup> of high-quality 3D seismic data, integrated with potential field data and existing wells, led to the interpretation of the main horizons and unconformities in the sedimentary sequence, with focus on the salt structures.</p><p>The top of the salt is characterized by a strong positive-amplitude reflection in the seismic data, and has been interpreted with a line spacing of 100 m. Subsequent gridding of the interpreted horizon to a bin size of 12.5 m highlights that the geomorphology for the top of the three salt structures is particularly complex, with presence of salt horns and development of minibasins above the salt. Integration of potential field data shows a strong correlation between salt structures and low values in Bouguer-Gravity anomalies. Different families of faults related to salt and to crustal tectonics have been mapped, and strong seismic anomalies related to faults above the salt structures are identified at multiple stratigraphic levels. Part of these faults have been active until 20 000 years ago, and are rarely active at present day.</p><p>The three salt structures interpreted on the western side of the Senja Ridge have a total extent of around 800 km<sup>2</sup> and are mainly the consequence of different pulses of reactive diapirism, due to several diachronous rifting events during the opening of the Barents Sea. After the opening of the Sørvestsnagets Basin, salt tectonics continued and was influenced by crustal movements and glacial sedimentation and erosion in this pull-apart basin setting.</p><p>The presence of the strong seismic anomalies above the salt structures is interpreted as gas accumulations, which makes this topic of particular interest for the future development of the oil and gas industry of the SW Barents Sea.</p>

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