Controls on minibasin infill in the Nordkapp Basin: Evidence of complex Triassic synsedimentary deposition influenced by salt tectonics

Rojo, Luis Alberto; Escalona, Alejandro

doi:10.1306/0926171524316523

Cited by 23 publications

(22 citation statements)

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“…The Triassic minibasins of the Nordkapp Basin record the NW-SE transgressive-regressive fluviodeltaic systems of the Sassendalen and Kapp Toscana groups, which progressively prograded towards the NW of the Barents Shelf ( Figure 1C) [32][33][34][35]. Based on the Goliat discovery in the Hammerfest Basin, oil and gas-prone source rocks may be present in the Sansendalen Group, whereas shallow marine and fluviodeltaic reservoirs can be present in the Sassendalen and Kapp Toscana groups [5,17].…”

Section: Mesozoicmentioning

confidence: 99%

“…Based on the structural restorations, near-diapir structural and stratigraphic traps were present since the end of the Early Triassic (Figures 4 and 11). Megaflaps [5,63] and halokinetic sequences [5,64,65], which formed in response to the active and passive stages of diapirism from the Early Triassic to Cretaceous (Figure 4, IV-VII, and Figure 11), are present at different stratigraphic levels. Potential traps also include Early-Middle Triassic half turtle structures (Figure 4, IV) and suprasalt fault complexes at the basin boundaries ( Figure 4B, I).…”

Section: Trapsmentioning

confidence: 99%

“…The occurrence of evaporitic intervals in sedimentary basins and their subsequent mobilization play an important role in the evolution of the petroleum system [1,2]. Salt mobilization and diapirism control the spatial and temporal distribution of suprasalt reservoirs and source rocks [3][4][5], and they influence the style and timing of stratigraphic and structural traps. Salt's low permeability also inhibits the vertical migration of hydrocarbons, deflecting migration pathways [6].…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

et al. 2019

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Although the thermal effect of large salt tongues and allochthonous salt sheets in passive margins is described in the literature, little is known about the thermal effect of salt structures in confined rift basins where sub-vertical, closely spaced salt diapirs may affect the thermal evolution and petroleum system of the basin. In this study, we combine 2D structural restorations with thermal modeling to investigate the dynamic history of salt movement and its thermal effect in the Nordkapp Basin, a confined salt-bearing basin in the Norwegian Barents Sea. Two sections, one across the central sub-basin and another across the eastern sub-basin, are modeled. The central sub-basin shows deeply rooted, narrow and closely spaced diapirs, while the eastern sub-basin contains a shallower rooted, wide, isolated diapir. Variations through time in stratigraphy (source rocks), structures (salt diapirs and minibasins), and thermal boundary conditions (basal heat flow and sediment-water interface temperatures) are considered in the model. Present-day bottom hole temperatures and vitrinite data provide validation of the model. The modeling results in the eastern sub-basin show a strong but laterally limited thermal anomaly associated with the massive diapir, where temperatures in the diapir are 70 °C cooler than in the adjacent minibasins. In the central sub-basin, the thermal anomalies of closely-spaced diapirs mutually interfere and induce a combined anomaly that reduces the temperature in the minibasins by up to 50 °C with respect to the platform areas. Consequently, source rock maturation in the areas thermally affected by the diapirs is retarded, and the hydrocarbon generation window is expanded. Although subject to uncertainties in the model input parameters, these results demonstrate new exploration concepts (e.g., deep hydrocarbon kitchens) that are important for evaluating the prospectivity of the Nordkapp Basin and similar basins around the world.

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Section: Mesozoicmentioning

confidence: 99%

Section: Trapsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

et al. 2019

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“…As a salt diapir passively rises, halokinetic features and stratal geometries near the salt-sediment interface record the complex interactions between the relative rates of sediment accumulation and salt rise (Giles and Lawton, 2002;Giles and Rowan, 2012). However, recent studies of salt walls typically focus on only one aspect of the salt wall history: the depositional facies or single-channel systems directly adjacent to the salt walls (e.g., Gee and Gawthorpe, 2006;Matthews et al, 2007;Banham and Mountney, 2013;Venus et al, 2015;Doughty-Jones et al, 2017), broader minibasin-scale facies and stratal geometries (e.g., Oluboyo et al, 2014;Ribes et al, 2015;Rojo and Escalona, 2018), or the structural or deformational kinematic analysis of salt movement (e.g., Trudgill and Rowan, 2004;Stewart, 2006;Trudgill 2011;Rowan et al, 2016). There are few studies that integrate both structural and stratal histories adjacent to salt walls (e.g., Adam et al, 2012;Teixell et al, 2017;Martín-Martín et al, 2017), which is the only way the halokinetic history of salt walls and the geometries of strata in the surrounding basins can be assessed (e.g., Alsop et al, 2016).…”

Section: ■ Introductionmentioning

confidence: 99%

Controls on the structural and stratigraphic evolution of the megaflap-bearing Sinbad Valley salt wall, NE Paradox Basin, SW Colorado

et al. 2019

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The interplay between sedimentation and salt rise around a diapir results in distinct geometries that can be used to determine the structural and stratigraphic history within a basin. Using new geologic mapping, measured stratigraphic sections, and subsurface interpretations of seismic and well logs, we describe circum-diapir stratal geometries and deformation at the Sinbad Valley salt wall in the proximal, northeastern Paradox Basin, southwest Colorado (USA). We interpret these geometries in the context of newly recognized halokinetic features and salt-associated deformation (megaflaps, counterregional faults, intrasalt inclusions), present a revised stratigraphic and salt tectonic history of Sinbad Valley diapir, and compare these proximal features to those at the distal Gypsum Valley diapir and infer local versus regional controls on their formation. The deposition of conglomerates within the Paradox Formation, now preserved as intrasalt inclusions in the center of Sinbad Valley, record early elevation of the Uncompahgre Uplift. Subsequent differential sedimentary loading resulted in initiation of passive diapirism during the late Pennsylvanian through the latest Triassic/Early Jurassic, facilitated by movement on a NE-dipping, listric, counterregional fault that extends for >22 km southeast of the diapir. Exposures of a steeply dipping stratal panel of late Pennsylvanian-aged Honaker Trail Formation along the southwestern flank of Sinbad Valley are interpreted as a megaflap, a preserved remnant of the diapir roof that was folded into a vertical position by drape-folding during passive salt rise. Significant lateral changes in the surface geometry and depositional facies of the megaflap define four structural domains that may result from a combination of radial faulting and varying degrees of folding via limb rotation or limb rotation with minor hinge migration. Using key differences between Sinbad Valley and Gypsum Valley salt walls in regard to the megaflap facies, timing of megaflap formation, and the presence of a Paradox Formation conglomeratic intrasalt inclusion, we conclude that salt wall position (i.e., proximal versus distal) within a basin influences the characteristics of some of these features, whereas the timing of other features (e.g., megaflap formation) appears to be similar throughout the basin suggesting a more regional control.

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“…Paradox Basin; Trudgill, ) and salt‐related rift basins (e.g. Nordkapp Basin; Koyi, Talbot, & Tørudbakken, ; Rojo & Escalona, ; Rowan & Lindsø, ). Contrary to other basins without the presence of salt, salt‐bearing basins show a complex feedback between the salt and the sediments.…”

Section: Introductionmentioning

confidence: 99%

The influence of halokinesis on prograding clinoforms: Insights from the Tiddlybanken Basin, Norwegian Barents Sea

et al. 2019

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Controls on minibasin infill in the Nordkapp Basin: Evidence of complex Triassic synsedimentary deposition influenced by salt tectonics

Cited by 23 publications

References 58 publications

The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

Controls on the structural and stratigraphic evolution of the megaflap-bearing Sinbad Valley salt wall, NE Paradox Basin, SW Colorado

The influence of halokinesis on prograding clinoforms: Insights from the Tiddlybanken Basin, Norwegian Barents Sea

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