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X-WR-CALDESC:Events for Geolunch seminar @ UiB
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DTSTART;TZID=Europe/Oslo:20240605T001500
DTEND;TZID=Europe/Oslo:20240605T130000
DTSTAMP:20260429T205818
CREATED:20240408T115958Z
LAST-MODIFIED:20240604T085144Z
UID:903-1717546500-1717592400@geolunch.w.uib.no
SUMMARY:Eliane Petersohn
DESCRIPTION:Investigating Naturally Fractured Reservoirs in the Brazilian Pre-Salt Play \nEliane Petersohn \nEliane is an experienced geologist working for ANP (Agência Nacional do Petróleo\, equivalent to the Norwegian Offshore Directorate) in Brazil for more than 15 years\, currently on leave to do a Fulbright-funded PhD project at Stanford. There\, she is working on the relationship between deformation structures (fractures\, mostly) and fluid flow in the subset carbonate reservoirs offshore Brazil\, employing a wealth of well and seismic data available through ANP.  \nAbstract: \nNatural fracture networks significantly enhance reservoir permeability\, facilitating fluid flow and optimizing production rates within carbonate reservoirs. However\, these networks also introduce heterogeneity\, creating complex flow pathways that can be challenging to characterize and quantify. Similarly\, fault systems act as conduits or barriers to fluid flow\, contributing to reservoir heterogeneity and potentially inducing fracturing. Understanding the interplay between these features is crucial for effective reservoir management. The Brazilian Pre-salt Province\, characterized by naturally fractured carbonate reservoirs with exceptionally high production rates\, exemplifies this challenge. While the high productivity is likely linked to interconnected fracture and fault systems\, their complex nature and limitations in observation scale make characterization challenging. My research aims to unravel this complexity by investigating the relationship between fracture networks\, fault systems\, and their influence on reservoir property distribution. To achieve this\, I propose an integrated approach encompassing 3D seismic interpretation\, geomechanical modeling\, and analysis of seismic and sonic anisotropy. Preliminary results from a strategically selected well in the Atapu field reveal valuable insights into fracture characteristics\, including a consistent WSW-ENE strike orientation. However\, a clear correlation between highly fractured intervals and permeability\, porosity\, or silica content was not observed. Notably\, fractures do correlate with vuggy porosity estimated from the acoustic borehole image (BHI). Additionally\, a fracture index\, developed using random forest regression on well log responses and BHI-interpreted fracture intensity\, demonstrates promising results in predicting fractured intervals.
URL:https://geolunch.w.uib.no/event/eliane-petersohn/
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DTSTART;TZID=Europe/Oslo:20240612T121500
DTEND;TZID=Europe/Oslo:20240612T130000
DTSTAMP:20260429T205818
CREATED:20231119T202241Z
LAST-MODIFIED:20240612T070605Z
UID:841-1718194500-1718197200@geolunch.w.uib.no
SUMMARY:Umut Isikalp
DESCRIPTION:4D Evolution of a Salt Wall and Implication for Flanking Minibasin Stratigraphy: An Example from the Egersund Basin\, Norwegian North Sea  \nUmut Isikalp \nSalt diapirs are the most common type of salt-tectonic structure\, occurring in many\, if not all\, salt basins. Two main types of diapiric structures are typically developed: salt walls\, which are defined by axial ratios >2\, and salt stocks\, which have axial ratios <2. Diapirs form in response to a range of geological processes\, including contraction\, extension\, differential loading\, and buoyancy instabilities. Differential loading is often associated with the formation of minibasins\, which subside and subsequently drive salt into adjacent diapirs. Although we have a good general understanding of the growth of diapirs\, our knowledge of their four-dimensional evolution and the temporal and spatial relationships between walls and stocks is relatively limited.\nIn this study\, we examine Triassic stratal geometries around a 23 km long\, 2.5 km wide and 3100 ms (TWT) tall salt wall in the Egersund Basin\, offshore Norway. In particular\, we explore how stratal geometries develop in 4-D and how they are influenced by evolving salt structure and other controls in a continental depositional environment. The Egersund Basin and the salt wall we have chosen are an ideal study location\, given it contains seismically well-imaged salt structures and adjacent minibasins. Well 17-12-1R penetrates the entire thickness of the Triassic minibasin succession\, allowing us to construct a robust\, age-constrained seismic-stratigraphic framework\, and to analyse diapir kinematics in 4-D. \nWe identify and map six Triassic sequences and undertake schematic restorations of Triassic stratal geometries on both wall-perpendicular and wall-parallel (through axes of flanking minibasins) seismic sections. Analysis of thickness patterns and salt-sediment relationships on wall-perpendicular sections suggests the initial trigger for salt mobilization into the wall was sediment loading. This loading led to the formation of a pillow\, which\, during the early Carnian period\, evolved diachronously into a wall due to the varying timing of erosion of the overburden and active diapirism. Thickness patterns\, stratal upturns\, the style\, and distribution of angular unconformities between seismic sequences\, and variations in axial fold traces suggest the driving force of wall growth from the mid-Carnian to the end of the Triassic was passive diapirism (i.e.\, sediment loading)\, which was associated with minibasin downbuilding. Wall-parallel seismic sections within the axes of flanking minibasins indicate that superimposed on this general growth pattern was the formation of along-strike turtle structures\, pointing the growth of salt welds during both the Carnian and Norian periods\, related to complex\, four-dimensional salt flow into nearby diapirs.\nThe complex spatio-temporal variations in subsidence\, stratal upturns\, angular unconformities\, thickening\, and thinning patterns around the salt wall over time\, driven by salt flow and diapir evolution\, have significant implications for the geometry and distribution of potential reservoirs\, relevant for both carbon capture and storage as well as traditional oil and gas exploration.
URL:https://geolunch.w.uib.no/event/umut-isikalp-2/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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