
Benedict PreuChevron North Sea Limited · Reservoir Management
Benedict Preu
Dr. rer. nat.
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33
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Introduction
Publications
Publications (33)
Paleo-shorelines on continental shelves give insights into the complex development of coastlines during sealevel cycles. This study investigates the geologic development of the Limpopo Shelf during the last sealevel cycle using multichannel seismic and acoustic datasets acquired on the shelf in front of the Limpopo River mouth. A detailed investiga...
This work uses seismic records to document and classify contourite features around the Iberian continental margin to determine their implications for depositional systems and petroleum exploration. Contourites include depositional features (separated, sheeted, plastered and confined drifts), erosional features (abraded surfaces, channels, furrows a...
Our understanding of bottom-currents and associated oceanographic processes (e.g., overflows, barotropic tidal currents) including intermittent processes (e.g., vertical eddies, deep sea storms, horizontal vortices, internal waves and tsunamis) is rapidly evolving. Many deep-water processes remain poorly understood due to limited direct observation...
For the first time, a multidisciplinary approach to evaluate the influence of bottom currents in the Uruguayan continental margin is presented. Bathymetric data and multichannel 2D and 3D seismic reflection profiles were used to construct a morphosedimentary map to interpret and decode sedimentary and oceanographic processes along the Uruguayan con...
The aim of the present study was to characterise the morpho-sedimentary features and main stratigraphic stacking pattern off the Tierra del Fuego continental margin, the north-western sector of the Scotia Sea abyssal plain (Yaghan Basin) and the Malvinas/Falkland depression, based on single- and multi-channel seismic profiles. Distinct contourite f...
Our understanding of the role of bottom currents and associated oceanographic processes (e.g, overflows, barotropic tidal currents) including intermittent processes (e.g, vertical eddies, deep sea storms, horizontal vortices, internal waves and tsunamis) is rapidly evolving. Many deep-water processes remain poorly understood due to limited direct o...
Submarine landslides are common along the Uruguayan and Argentinean continental margin, but size, type and frequency of events differ significantly between distinct settings. Previous studies have proposed sedimentary and oceanographic processes as factors controlling slope instability, but also episodic earthquakes have been postulated as possible...
We characterize the eastern Gulf of Cadiz, proximal to the Strait of Gibraltar, using a multidisciplinary approach that combines oceanographic, morphosedimentary, and stratigraphic studies. Two terraces (upper and lower) were identified along the middle slope. They are composed of several associated morphologic elements, including two large erosive...
The continental margin off SE South America hosts one of the world’s most energetic hydrodynamic regimes but also the second largest drainage system of the continent. Both, the ocean current system as well as the fluvial runoff are strongly controlled by the atmospheric circulation modes over the region. The distribution pattern of particular types...
Bottom currents and their margin-shaping character became a central aspect in the research field of sediment dynamics and paleoceanography during the last decades due to their potential to form large contourite depositional systems (CDS), consisting of both erosive and depositional features.A major CDS at the northern Argentine continental margin w...
Large sedimentary deposits consisting of several major contourite drifts were studied by means of high-resolution multichannel seismic data at the middle slope along the Northern Argentina Continental Margin to determine their evolutionary stages as well as to identify and assess the possible impact of Northern Source Deep Water (NSDW) on the slope...
An extensive terrace comprising sandy sheeted drifts characterises the proximal sector (close to the Straits of Gibraltar) of the Contourite Depositional System (CDS) of the Gulf of Cadiz and the western continental margin of Portugal. A novel morphosedimentary study over this terrace has been executed based on new multibeam echosounder data, seism...
Major plastered drift sequences were imaged using high-resolution multichannel seismics during R/V Meteor cruises M63/1 and
M75/3 south of the Mozambique Channel along the continental margin of Mozambique off the Limpopo River. Detailed seismic-stratigraphic
analyses enabled the reconstruction of the onset and development of the modern, discontinuo...
Detection and characterization of nepheloid layers, which are often bound to water mass interfaces, and benthic boundary layers are today mostly restricted to sampling and optical measurements allowing quantification of particles at one single location. However, spatial analysis of the lateral variability of suspension clouds would offer remarkable...
The continental margin off Uruguay and northern Argentina is characterized by high fluvial input by the de la Plata River
and a complex oceanographic regime. Here we present first results from RV Meteor Cruise M78/3 of May–July 2009, which overall
aimed at investigating sediment transport processes from the coast to the deep sea by means of hydroac...
A significant Contourite Depositional System on the slope of the Argentine margin was characterised, where several depositional and erosive features are well developed. This work is focused on one of these erosive features: the contourite terraces. A set of terraces with good lateral continuity has been described at different depths along the slope...
Morphological and seismic characteristics of the Ewing Terrace and associated contouritic deposits of the middle slope of the western sector of the Argentine Continental Margin are described.
About 90% of the sediments generated by weathering and erosion on land get finally deposited at the ocean margins. The sediment distribution processes and landscape evolution on land are relatively well understood, but comparably little is known about the role and relative importance of marine sediment dynamics in controlling the architectural evol...
New geophysical acquired during cruise M78 with RV "Meteor" in 2009
reveal a large-scale slope failure complex. Positioned between 1800 and
3300 m water depth, the slope failure affected an area of at least 1200
km². The failure is hosted in contouritic deposits. The morphology
of the up 70 m high headwalls is underlain by a deeper reflector which...
Down-slope and along-slope sediment transport processes play a prominent role by shaping of passive continental margins. Mass wasting phenomena at continental margins have become a hot topic in recent time because of their coastal geo-hazard potential. In addition, deposition (and erosion) related to along-slope transport processes documents the im...
As part of the global conveyer belt circulation, the Agulhas, Mozambique
and Madagascar Currents are guided southward along the Southeast African
margin as strong contour currents, affecting local sediment
mobilization, redistribution and deposition. To gain a better
understanding of their evolution through time, a transect of drill sites
ranging f...
During R/V Meteor Cruise M75/3 in March/April 2008, multichannel seismic and acoustic measurements have been carried out along the Southeast African Margin. A combined survey on shelf areas offshore the Limpopo and Zambezi Rivers revealed pronounced shore-parallel ridges, indicating strong alongshore transport. The Madagascar and Agulhas current sy...
At the Uruguayan continental margin, seismic evidence for the occurrence of gas hydrate has been identified based on the presence of BSRs in densely spaced 2D reflection seismic sections from different surveys. Mapping of BSRs based on 2D seismic data acquired in 2007 and 2008 suggested the presence of gas hydrates in areas that were not previously...