Fault Rock Property Prediction On Jurassic Clastics Of The Barents Sea/Norway

2021 ◽  
Author(s):  
Volker Schuller ◽  
Andras Zamolyi ◽  
Eirik Stueland ◽  
István Dunkl ◽  
Michael Kettermann ◽  
...  
Keyword(s):  
Barents Sea ◽  
Early Stage ◽  
Upper Jurassic ◽  
Shallow Depth ◽  
Late Triassic ◽  
Burial Depth ◽  
Rock Permeability ◽  
Fault Rock ◽  
The Barents Sea ◽  
Wide Range

Abstract We analysed the fault rocks of a compartmentalized field in the Barents Sea, in an area with several tectonic elements, which formed at different tectonic events. Standard Fault Seal Analysis (FSA) was conducted to predict the shale content of the fault rock (SGR). A static cellular model based on well data, seismic data and geological concepts served as input. The fault rock calibration workflow required various data acquired by different methods. We analysed the Mid-Triassic to Upper Jurassic clastic deposits to reconstruct the tectonic history. Apatite fission track and (U-Th)/He thermochronology were used to determine the maximum burial depths and exhumation history. The results of high-resolution shale ductility analysis (BIB-SEM), a compaction trend study, kinematic analysis and structural modelling (section balancing) served as additional input constraints for fault rock calibration. The evaluation of the results helped to reconstruct the following tectonic evolution: The orthogonal faults of the analysed area developed at an early stage, during Late Triassic to Early Jurassic times at relatively shallow depth, below 1000 m. Ongoing subsidence created accommodation space for Upper Jurassic to Cenozoic deposits with a maximum burial depth of 2000 m for the analysed Mid-Jurassic rocks. Exhumation of the area started around 10 Ma and continued through to Quaternary times. The calculated values for fault rock permeability show a wide range when using poorly constrained input for fault rock calibration: 10 to 1000 mD for SGR values around 0.08 at reservoir/reservoir juxtaposition. Fault rock calibration using above described results concluded in reliable values for fault rock permeability and ultimately, for transmissibility multipliers. The reason for the sensitivity of the fault rock calibration is a combination of multiple factors: highly permeable reservoir sandstone, shallow depth of initial faulting, maximum burial depth and low shale content at the primary reservoir level. The study shows that an accurate reconstruction of the geohistory provides essential parameters for fault rock calibration and fault rock permeability calculation. The range of values can widely scatter if preconditions are not acknowledged. Well-constrained fault rock calibration reduces the uncertainty on possible flow scenarios, increases the reliability on production forecasts and helps to determine the most efficient drainage strategy.

Tectonic History of Hoop Fault Complex, Barents Sea/Norway

2020 ◽  
Author(s):  
Volker Schuller ◽  
István Dunkl ◽  
Zsolt Schleder ◽  
Eirik Stueland
Keyword(s):  
Barents Sea ◽  
Early Stage ◽  
Upper Jurassic ◽  
Late Triassic ◽  
Tectonic Activity ◽  
Burial Depth ◽  
Seismic Section ◽  
Accommodation Space ◽  
Tectonic History ◽  
History Of

<p>The Barents Sea consists of several tectonic elements which were formed at different plate tectonic collisional and rifting stages. This work focuses on the Early Mesozoic to recent events of the central Barents Sea, the eastern edge of the Bjarmaland platform.</p><p>We have analysed the clastic deposits of Mid-Triassic to Upper Jurassic to reconstruct the tectonic history of the Hoop Fault Complex, Barents Sea/Norway. Apatite fission track and (U-Th)/He thermochronology were used to determine the maximum burial depths and exhumation history. According to the combined evaluation of results from shale ductility analysis (BIB-SEM), fault kinematic analysis and structural modelling (section balancing based on a 125 km long 2D seismic section line) the following tectonic evolution can be drawn: deflation of late Palaeozoic salt deposits was initiated by the tectonic activity on the early structures of the Hoop Fault zone. The orthogonal faults of the Hoop Fault Complex developed at the early stage, during Late Triassic to Early Jurassic times at relatively shallow depth, below 1000m. Ongoing subsidence related to the extension caused by the opening of the Atlantic Ocean created accommodation space for Upper Jurassic to Cenozoic deposits with maximum burial depth of 2000 m for the analysed Mid-Jurassic rocks. The exhumation of the Hoop Fault complex started around 10 Ma and remained constant until Quaternary times (140 m/Myr).</p>

Seismic methods for fluid discrimination in areas with complex geologic history — A case example from the Barents Sea

2020 ◽  
Vol 8 (1) ◽  
pp. SA35-SA47 ◽  
Author(s):  
Ivan Lehocki ◽  
Per Avseth ◽  
Nazmul Haque Mondol
Keyword(s):  
Barents Sea ◽  
Density Ratio ◽  
Training Data ◽  
Fluid Distribution ◽  
Temperature History ◽  
Burial Depth ◽  
Burial History ◽  
Geologic History ◽  
Data Set ◽  
The Barents Sea

We have developed a new scheme for calculation of density ratio, an attribute that can be directly linked to hydrocarbon saturation, and applied it to seismic amplitude variation with offset (AVO) data from the Hoop area in the Barents Sea. The approach is based on the inversion of Zoeppritz’s equation for PP-wave. Furthermore, by using interval velocities, we quantified uplift magnitude for a given interval beneath Base Cretaceous unconformity (BCU) horizon in the Hoop area. Depending on the temperature gradient, the maximum burial depth can be estimated, a crucial factor affecting the elastic properties of the rocks. Coupling uplift map with temperature history for key stratigraphic units from basin modeling enabled us to extend the training data away from well control. By doing so, we created nonstationary AVO probability density functions (PDFs) for calibration and classification of seismic attributes in the test area. This decreases the likelihood of misclassification of pore fluid type as opposed to the case where the training data are created based only on sparse well-log data. We tested and compared the methods on the Barents Sea seismic data set, and the results were validated at four well locations. Finally, maps of fluid distribution obtained from stochastic rock-physics modeling honoring burial history were compared against the density ratio map. Four maps revealed the same anomalous zones, the major difference being the detection of the down-flank presence of oil associated with some of the predicted gas anomalies in the prospect area, in the case of density ratio map. Possible gas caps were detected/predicted only for certain temperature constraints during the AVO classifications and were most obvious in the density ratio map.

scholarly journals Evidence for Late Triassic provenance areas and Early Jurassic sediment supply turnover in the Barents Sea Basin of northern Pangea

Lithosphere ◽  
2016 ◽  
Vol 9 (1) ◽  
pp. 14-28 ◽  
Author(s):  
Tore Grane Klausen ◽  
Reidar Müller ◽  
Jiri Slama ◽  
William Helland-Hansen
Keyword(s):  
Barents Sea ◽  
Early Jurassic ◽  
Sediment Supply ◽  
Late Triassic ◽  
The Barents Sea ◽  
Provenance Areas

scholarly journals Establishment and ecosystem effects of the alien invasive red king crab (Paralithodes camtschaticus) in the Barents Sea–a review

2011 ◽  
Vol 68 (3) ◽  
pp. 479-488 ◽  
Author(s):  
Jannike Falk-Petersen ◽  
Paul Renaud ◽  
Natalia Anisimova
Keyword(s):  
Barents Sea ◽  
Suitable Habitat ◽  
Red King Crab ◽  
Paralithodes Camtschaticus ◽  
Potential Threat ◽  
Commercial Fish ◽  
King Crab ◽  
Ecosystem Effects ◽  
The Barents Sea ◽  
Wide Range

Abstract Falk-Petersen, J., Renaud, P., and Anisimova, N. 2011. Establishment and ecosystem effects of the alien invasive red king crab (Paralithodes camtschaticus) in the Barents Sea – a review. – ICES Journal of Marine Science, 68: . Since its introduction to the Barents Sea from the North Pacific in the 1960s, the red king crab (Paralithodes camtschaticus) has become invasive. The crab represents an important source of income, but also a potential threat to the highly productive fisheries in the region through its ecosystem impacts. A literature review was conducted, identifying factors contributing to the success of the crab as well as its interactions with native biota. Characteristics of the Barents Sea and the crab itself that may explain its success include suitable habitat for settlement and growth of the larvae; the wide range of habitats occupied throughout its life history, high mobility, generalist prey choice, low fishing pressure during establishment, and the lack of parasites. Being a large, bottom-feeding omnivore of great mobility, the king crab can significantly impact the ecosystem. Reduced benthic diversity and biomass have been registered in invaded areas. Important prey items include large epibenthic organisms whose structures also represent important habitat. Impacts on commercial and non-commercial fish species, through egg predation or indirect interactions, are difficult to detect and predict.

scholarly journals The Jurassic of Kuhn Ø, North-East Greenland

2003 ◽  
Vol 1 ◽  
pp. 865-892 ◽  
Author(s):  
Per C. Alsgaard ◽  
Vince L. Felt ◽  
Henrik Vosgerau ◽  
Finn Surlyk
Keyword(s):  
Source Rock ◽  
Middle Jurassic ◽  
Barents Sea ◽  
Upper Jurassic ◽  
Shallow Marine ◽  
East Greenland ◽  
Base Level ◽  
North East ◽  
The Barents Sea ◽  
Lower Unit

The Middle–Upper Jurassic succession of Kuhn Ø, North-East Greenland accumulated in a major half-graben and is an excellent analogue for the subsurface of the mid-Norwegian shelf. On Kuhn Ø, peneplaned crystalline basement was incised by a drainage system during a major base-level lowstand, probably in late Early or early Middle Jurassic times. It was filled with fluvial conglomerates of the newly defined Middle Jurassic Bastians Dal Formation during subsequent base-level rise. As sea level continued to rise, precursor-peat of the coals of the Muslingebjerg Formation formed in swamps which covered the conglomerates and filled the remaining space of the incised valley system. The valley and interfluve areas were flooded in Late Bathonian – Callovian times and tidally-dominated, shallow marine sandstones of the Pelion Formation were deposited on top of the valley fill and over the adjacent basement peneplain. These sandstones are overlain by the newly defined shallow marine Oxfordian Payer Dal Formation which is subdivided into a lower unit and an upper unit, separated by a major drowning surface. The Payer Dal Formation sands were flooded in the Late Jurassic and organic-rich, offshore mudstones of the Bernbjerg Formation were deposited. The Jurassic succession of Kuhn Ø can thus be subdivided into large-scale sedimentary units separated by major drowning surfaces. They are of regional extent, and in combination with biostratigraphic and 87Sr/86Sr isotope data they allow the correlation of the sedimentary units on Kuhn Ø with more offshore deposits to the south in Wollaston Forland and more landwards successions to the north in Hochstetter Forland. Petrographically, the trough cross-bedded sandstones of the Pelion Formation and the lower unit of the Payer Dal Formation include both calcite-cemented and poorly cemented quartz sandstones. The calcite cement was derived from dissolution of abundant calcareous fossils and forms concretionary horizons. The upper unit of the Payer Dal Formation mainly consists of weaklycemented quartz sandstones with porosities around 30%. The sandstones of the Pelion and Payer Dal Formations on Kuhn Ø are petrographically very similar to Jurassic sandstones from the mid- Norwegian shelf and the Barents Sea with regard to original mineralogical composition, sorting and grain size. The Bernbjerg Formation mudstones are comparable to the Upper Jurassic source rock of the mid-Norwegian shelf and the Barents Sea, but have lower hydrogen index (HI) values due to terrigenous input in a relatively proximal setting. Coals of the Muslingebjerg Formation have significant source rock potential with measured HI values up to 700, kerogen types II–III and total organic carbon (TOC) values above 50%.

scholarly journals Cucumaria in Russian Waters of the Barents Sea: Biological Aspects and Aquaculture Potential

2021 ◽  
Vol 8 ◽  
Author(s):  
Alexander G. Dvoretsky ◽  
Vladimir G. Dvoretsky
Keyword(s):  
Sea Cucumber ◽  
Barents Sea ◽  
Natural Populations ◽  
Pharmaceutical Products ◽  
Bioactive Substances ◽  
Sea Cucumbers ◽  
Food Items ◽  
The Barents Sea ◽  
Wide Range ◽  
Sea Ranching

Sea cucumbers are a popular luxury and delicacy food items in Asian markets. These echinoderms possess a wide range of bioactive substances that can be used to produce pharmaceutical products. Recent depletion of natural populations of sea cucumbers requires involving new objects both in commercial harvesting and aquaculture. The northern sea cucumber Cucumaria frondosa is the most abundant sea cucumber in the Barents Sea. In this paper, we summarized literature data on the biology of this polar species to evaluate its fishery and aquaculture potential in the area. This eurythermic sea cucumber is typically occurs at 20–100 m depth. Cucumaria mainly colonize rocky or pebbly bottoms. Their main food items are detritus, pellets, phytoplankton, and small planktonic crustaceans. Spawning is registered in February–May. The age of commercial specimens (body length 25–30 cm, wet weight 300–350 g) is 10 years. The most abundant stocks of C. frondosa are registered in the central and south-eastern parts of the sea. Due to the low growth rate of Cucumaria the most appropriate cultivation method for these holothurians is a combination of larval culture and sea ranching. Coastal sites of the Barents Sea merit all the criteria for sea ranching of Cucumaria, but the development of their extensive aquaculture requires significant investments with long pay-back periods.

scholarly journals A comprehensive bibliography, updated checklist, and distribution patterns of Rhodophyta from the Barents Sea (the Arctic Ocean)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tatiana A. Mikhaylova
Keyword(s):  
Temporal Variability ◽  
Barents Sea ◽  
Distribution Patterns ◽  
The Arctic ◽  
The Barents Sea ◽  
Wide Range ◽  
The Arctic Ocean ◽  
Careful Revision ◽  
Academy Of Sciences ◽  
Bibliographic Study

Abstract A lot of data on the flora of the Barents Sea are scattered in Russian publications and thus are largely inaccessible to many researchers. The study aims to compile a checklist and to verify the species composition of the Rhodophyta of the Barents Sea. The checklist is based on a comprehensive bibliographic study referring to a wide range of data on the species distribution, from the oldest to the most recent, indispensable for analyzing the temporal variability of the Barents Sea flora. A careful revision allows the report of 82 species of Rhodophyta, whereas 36 species have been excluded as belonging to doubtful records or misidentifications. The distribution of seven species in the Barents Sea is clarified. Seventeen species are widespread in the Barents Sea; 11 species are distributed locally. An extensive bibliography and data on the presence of the specimens in the herbarium of the Komarov Botanical Institute of the Russian Academy of Sciences are provided.

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