The Håpet Dome in the Norwegian Barents Sea, Structural Evolution and Morphometry of Salt Basins

2016 ◽  
Author(s):  
R.W. Dellmour ◽  
E. Stueland AS ◽  
S. Lindstrom AS ◽  
G. Tari ◽  
S. Purkis
Keyword(s):  
Barents Sea ◽  
Structural Evolution

scholarly journals Structural evolution of sheared margin basins: the role of strain partitioning. Sørvestsnaget Basin, Norwegian Barents Sea

2017 ◽  
Vol 30 (2) ◽  
pp. 279-301 ◽  
Author(s):  
Thomas B. Kristensen ◽  
Atle Rotevatn ◽  
Maria Marvik ◽  
Gijs A. Henstra ◽  
Robert L. Gawthorpe ◽  
...  
Keyword(s):  
Barents Sea ◽  
Structural Evolution ◽  
Strain Partitioning

Influence of a multi-layered salt stratigraphy on rift-basin development; Insights from the Slyne and Erris basins, offshore NW Ireland

2020 ◽  
Author(s):  
Conor O'Sullivan ◽  
Conrad Childs ◽  
Muhammad Saqab ◽  
John Walsh ◽  
Patrick Shannon
Keyword(s):  
Barents Sea ◽  
Structural Evolution ◽  
Upper Permian ◽  
Northern Coast ◽  
Borehole Data ◽  
Gas Field ◽  
Development Fund ◽  
The North ◽  
Basin Development ◽  
Atlantic Margin

<p>This study uses a combination of 2D and 3D seismic reflection surveys coupled with borehole data from the Irish Atlantic margin to map the distribution of salt in the Slyne and Erris basins and understand its influence on basin development throughout the Mesozoic.</p><p>The north-western European Atlantic margin is populated by a framework of rift basins stretching from the Barents Sea offshore northern Norway to the south of Portugal. Several of these basins contain significant quantities of salt, which plays an important role in basin development and structural evolution. While salt is present on the Irish Atlantic margin, its distribution and role in basin development is poorly understood. The Slyne and Erris basins, off the northern coast of Ireland, contain two proven layers of salt; the Upper Permian Zechstein Group and the Upper Triassic Uilleann Halite Member of the Currach Formation.</p><p>Where present in their salt-dominated forms, both layers act as décollements, mechanically detaching pre-, intra- and post-salt stratigraphy. The Zechstein Group is present throughout the Slyne and Erris basins, while the Uilleann Halite Member is only developed in the northern Slyne Basin and the southern Erris Basin. Both salt layers have undergone significant halokinesis during basin development, and their original thicknesses are unclear. This halokinesis has played a significant role in the formation of hydrocarbon traps in these basins: the Zechstein Group forms salt pillows and salt rollers, causing folding and rafting in the overlying Mesozoic section, driven by active faulting in the pre-salt Palaeozoic basement. The Uilleann Halite Member caused thin-skinned crestal collapse and delamination of the overlying Jurassic section above anticlines cored by Zechstein salt. Both layers of salt play a key role in the development of the Corrib gas field and are responsible for trap formation in the Corrib North and Bandon discoveries. Understanding the genesis of these salt-related structures in a multi-layered salt system will provide insight into future exploration activities in salt-prone basins offshore Ireland, as well as their suitability for storage of sequestered CO<sub>2</sub>.</p><p>ICRAG is funded in part by a research grant from Science Foundation Ireland (SFI) under Grant Number 13/RC/2092 and is co-funded under the European Regional Development Fund and by PIPCO RSG and its member companies.</p>

Tromsø - Bjørnøya Composite Tectono-Sedimentary Element

2021 ◽  
pp. M57-2018-19
Author(s):  
Alf Eivind Ryseth ◽  
Dominique Similox-Tohon ◽  
Olaf Thieβen
Keyword(s):  
Early Cretaceous ◽  
Middle Jurassic ◽  
Late Jurassic ◽  
Barents Sea ◽  
Structural Evolution ◽  
Primary Source ◽  
Source Rocks ◽  
Late Paleozoic ◽  
The North ◽  
Sea Floor Spreading

AbstractThe Tromsø - Bjørnøya composite tectono-sedimentary element in the southwestern Barents Sea comprises strata of Late Paleozoic - Paleocene age. Since the Paleozoic Caledonian orogeny, the structural evolution of the CTSE is mainly related to extension, culminating in Late Jurassic - Early Cretaceous hyperextension. Some compressive deformation observed during Late Cretaceous - Paleogene times may relate to activity in the North Atlantic prior to the Early Eocene onset of sea floor spreading between Norway and Greenland.The sedimentary succession may be up to 14 km thick. It comprises Late Paleozoic continental facies, followed by carbonates, evaporites and eventually cherts and marine clastic material. The overlying Triassic - Paleocene succession is entirely siliciclastic, reflecting Triassic - Middle Jurassic deltaic and shallow marine conditions followed by deeper marine conditions during Late Jurassic - Paleocene times.Primary reservoirs are encountered in the latest Triassic - Middle Jurassic succession, with secondary reservoirs found in Late Jurassic - Early Cretaceous syn-rift succession, and in Paleocene strata. The primary source rock for petroleum is of Late Jurassic - Early Cretaceous age. Other source rocks include strata of Triassic and Barremian age, and a recently observed unit of Cenomanian - Early Turonian age.

Quantitative analysis of fault and fold growth in a salt-bearing transtensional basins: the Sørvestsnaget Basin, Western Barents Sea

2020 ◽  
pp. SP495-2020-123
Author(s):  
Thomas B. Kristensen ◽  
Atle Rotevatn ◽  
Maria Marvik ◽  
Gijs A. Henstra ◽  
Rob L. Gawthorpe ◽  
...  
Keyword(s):  
Barents Sea ◽  
Hanging Wall ◽  
Structural Evolution ◽  
Normal Fault ◽  
Growth Patterns ◽  
Hydrocarbon Exploration ◽  
Normal Faults ◽  
Lateral Migration ◽  
Seismic Reflection Data ◽  
Economic Implications

AbstractThe growth of faults and folds in basins formed under transtension has been less studied than in their extensional counterparts. In this study, we capitalise on 3D seismic reflection data to investigate the evolution of faults and folds that evolved coevally during sub-orthogonal partitioned extension and shortening, respectively, in the Sørvestsnaget Basin, Western Barents Sea. We use quantitative techniques to constrain the distribution of normal fault throw, shortening accommodated by folds and thrusts, and stratigraphic thickness variations, to analyse the relative temporal and spatial evolution of faults and folds. Our results show that normal faults display a similar evolution to those occurring in extensional basins, where they grew by lateral- and dip-linkage of individual fault segments as well as upward propagation. Notably, we show that shortening-related fold growth affected the fault growth patterns, skewing their throw distributions, and shifting the location of accommodation away from the evolving folds. Thus, fold amplification caused lateral migration of normal fault hanging-wall depocentres. Our results shed new light on fault and fold growth processes in transtensional basins and contributes to an improved understanding of the structural evolution of basins forming along sheared continental margins, which has economic implications for sheared-margin basins targeted for hydrocarbon exploration.

scholarly journals The Impact of Seismic Interpretation Methods on the Analysis of Faults: A Case Study from the Snøhvit Field, Barents Sea

2020 ◽  
Author(s):  
Jennifer Cunningham ◽  
Nestor Cardozo ◽  
Chris Townsend ◽  
Richard Callow
Keyword(s):  
Barents Sea ◽  
Structural Evolution ◽  
Vertical Displacement ◽  
Seismic Interpretation ◽  
Volume Calculation ◽  
Area Of Interest ◽  
Geological Modelling ◽  
X 32 ◽  
The Impact ◽  
Interpretation Method

Abstract. Five seismic interpretation experiments were conducted on an area of interest containing a fault relay in the Snøhvit field, Barents Sea, Norway, to understand how interpretation method impacts the analysis of fault and horizon morphologies, fault lengths, and vertical displacement (throw). The resulting horizon and fault interpretations from the least and most successful interpretation methods were further analysed to understand the impact of interpretation method on geological modelling and hydrocarbon volume calculation. Generally, the least dense manual interpretation method of horizons (32 inlines (ILs) x 32 crosslines (XLs), 400 m) and faults (32 ILs, 400 m) resulted in inaccurate fault and horizon interpretations and underdeveloped relay morphologies and throw that can be considered inadequate for any detailed geological analysis. The densest fault interpretations (4 ILs, 50 m) and auto-tracked horizons (1 IL x 1 XL, 12.5 m) provided the most detailed interpretations, most developed relay and fault morphologies and geologically realistic throw distributions. Analysis of the geological modelling proved that sparse interpretation grids generate significant issues in the model itself which make it geologically inaccurate and lead to misunderstanding of the structural evolution of the relay. Despite significant differences between the two models the calculated in-place petroleum reserves are broadly similar in the least and most dense experiments. However, when considered at field-scale the magnitude of the differences in volumes that are generated solely by the contrasting interpretation methodologies clearly demonstrates the importance of applying accurate interpretation strategies.

scholarly journals The impact of seismic interpretation methods on the analysis of faults: a case study from the Snøhvit field, Barents Sea

Solid Earth ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 741-764
Author(s):  
Jennifer E. Cunningham ◽  
Nestor Cardozo ◽  
Chris Townsend ◽  
Richard H. T. Callow
Keyword(s):  
Barents Sea ◽  
Structural Evolution ◽  
Seismic Interpretation ◽  
Volume Calculation ◽  
Area Of Interest ◽  
Geological Modelling ◽  
The Impact ◽  
Petroleum Reserves ◽  
Interpretation Method

Abstract. Five seismic interpretation experiments were conducted on an area of interest containing a fault relay in the Snøhvit field, Barents Sea, Norway, to understand how the interpretation method impacts the analysis of fault and horizon morphologies, fault lengths, and throw. The resulting horizon and fault interpretations from the least and most successful interpretation methods were further analysed to understand their impact on geological modelling and hydrocarbon volume calculation. Generally, the least dense manual interpretation method of horizons (32 inlines and 32 crosslines; 32 ILs × 32 XLs, 400 m) and faults (32 ILs, 400 m) resulted in inaccurate fault and horizon interpretations and underdeveloped relay morphologies and throw, which are inadequate for any detailed geological analysis. The densest fault interpretations (4 ILs, 50 m) and 3D auto-tracked horizons (all ILs and XLs spaced 12.5 m) provided the most detailed interpretations, most developed relay and fault morphologies, and geologically realistic throw distributions. Sparse interpretation grids generate significant issues in the model itself, which make it geologically inaccurate and lead to misunderstanding of the structural evolution of the relay. Despite significant differences between the two models, the calculated in-place petroleum reserves are broadly similar in the least and most dense experiments. However, when considered at field scale, the differences in volumes that are generated by the contrasting interpretation methodologies clearly demonstrate the importance of applying accurate interpretation strategies.

The Early Cretaceous Structural Evolution of the Tromsø Basin, SW Barents Sea

2017 ◽  
Author(s):  
B. Kairanov ◽  
A. Escalona ◽  
I. Norton ◽  
L.A. Lawver ◽  
P. Abrahamson
Keyword(s):  
Early Cretaceous ◽  
Barents Sea ◽  
Structural Evolution

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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