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<title lang=en>High-resolution architecture of a polygonal fault interval inferred from geomodel applied to 3D seismic data from the Gjallar Ridge, Vøring Basin, Offshore Norway</title>
<creator>LAURENT, Dimitri</creator>
<creator>GAY, Aurélien</creator>
<creator>Baudon, Catherine</creator>
<creator>Berndt, C.</creator>
<creator>Soliva, Roger</creator>
<creator>Planke, Sverre</creator>
<creator>Mourgues, R.</creator>
<creator>Lacaze, Sébastien</creator>
<creator>Pauget, Fabien</creator>
<creator>Mangue, Marion</creator>
<creator>Lopez, Michel</creator>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Environnements et Paléoenvironnements OCéaniques (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>National Oceanography Centre, Geology & Geophysics Research Group, Southampton ; Université du Québec</contributor>
<contributor>Risques ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>University of Oslo (UiO)</contributor>
<contributor>Laboratoire de Planétologie et Géodynamique de Nantes (LPGN) ; Université de Nantes (UN) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0025-3227</source>
<source>Marine Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00772470</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00772470</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00772470</source>
<source>Marine Geology, Elsevier, 2012, 332-334, pp.134-161. 〈10.1016/j.margeo.2012.07.016〉</source>
<identifier>DOI : 10.1016/j.margeo.2012.07.016</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2012.07.016</relation>
<language>en</language>
<subject lang=en>polygonal faulting</subject>
<subject lang=en>3D seismic geomodel</subject>
<subject lang=en>dip linkage</subject>
<subject lang=en>mechanical unit</subject>
<subject lang=en>fluid flow</subject>
<subject lang=en>PaleoScan© Software</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>3D seismic data located in the Gjallar Ridge (Vøring Basin, offshore Norway) reveals a closely-spaced polygonal fault system affecting more than 800 m of homogeneous mud-dominated Quaternary and Tertiary sequences. As some faults reach the modern seafloor, they represent an active polygonal fault system at present day. Even if the processes remain unclear and are still under debate, it is generally agreed that the initiation of polygonal faults is the result of shallow burial dewatering of fine-grained unconsolidated sediments by volumetric compaction. 3D seismic data are commonly interpreted by propagating horizons automatically and by picking faults manually. However, in the case of polygonal fault intervals, this approach is time consuming due to the huge number of faults and because automatic propagation can be misleading. In this study, we applied a new technique of 3D seismic interpretation based on a sequential stratigraphy analysis, using the new PaleoScan© software (Eliis Company). It allowed us to build a 3D geological model computing more than 300 horizons within the faulted intervals. We then used the coherency attribute, depicting anomalies in the shape of seismic waveform like faults, in order to constrain a possible link between fault distribution and stratigraphic levels. Our approach allows fault throws to be calculated in milliseconds on any polygonal fault plane. The result shows that fault segments have been reactivated by dip-linkage. Distribution of faults depends on mechanical units, intervals characterized by different petrophysical properties, which are independent from lithological and diagenetic changes. According to these results, we propose a model showing the evolution of polygonal fault intervals in which faulting stages are separated by a quiescence phase during burial. A first tier of polygonal faults is initiated at a specific depth, according to the Cam-clay model. Then, following a period of quiescence during which mud-rich sediments continued to accumulate, new fault segments are initiated above the first mechanical unit and within this undeformed interval. New nucleated faults then connect downward to pre-existing underlying polygonal fault system, thus progressively increasing the thickness of the faulted interval.</description>
<date>2012-12-01</date>
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