Crestal fault geometries reveal late halokinesis and collapse of the Samson Dome, Northern Norway: Implications for petroleum systems in the Barents Sea

Article English OPEN
Mattos, Nathalia H. ; Alves, Tiago M. ; Omosanya, Kamaldeen O. (2016)
  • Publisher: Elsevier BV
  • Journal: Tectonophysics (issn: 0040-1951, vol: 690, pp: 76-96)
  • Related identifiers: doi: 10.1016/j.tecto.2016.04.043
  • Subject: Geophysics | Earth-Surface Processes

This paper uses 2D and high-quality 3D seismic reflection data to assess the geometry and kinematics of the Samson Dome, offshore Norway, revising the implications of the new data to hydrocarbon exploration in the Barents Sea. The study area was divided into three (3) zones in terms of fault geometries and predominant strikes. Displacement-length (D-x) and Throw-depth (T-z) plots showed faults to consist of several segments that were later dip-linked. Interpreted faults were categorised into three families, with Type A comprising crestal faults, Type B representing large E-W faults, and Type C consisting of polygonal faults. The Samson Dome was formed in three major stages: a) a first stage recording buckling of the post-salt overburden and generation of radial faults; b) a second stage involving dissolution and collapse of the dome, causing subsidence of the overburden and linkage of initially isolated fault segments; and c) a final stage in which large fault segments were developed. Late Cretaceous faults strike predominantly to the NW, whereas NE-trending faults comprise Triassic structures that were reactivated in a later stage. Our work provides scarce evidence for the escape of hydrocarbons in the Samson Dome. In addition, fault analyses based on present-day stress distributions indicate a tendency for ‘locking’ of faults at depth, with the largest leakage factors occurring close to the surface. The Samson Dome is an analogue to salt structures in the Barents Sea where oil and gas exploration has occurred with varied degrees of success.
  • References (129)
    129 references, page 1 of 13

    Acocella, V., Funiciello, R., Marotta, E., Orsi, G., de Vita, S., 2004. The role of extensional structures on experimental calderas and resurgence. J. Volcanol. Geotherm. Res. 129, 199-217. http://dx.doi.org/10.1016/S0377-0273(03)00240-3.

    Alves, T.M., Cartwright, J., Davies, R.J., 2009. Faulting of salt-withdrawal basins during early halokinesis: effects on the Paleogene Rio Doce Canyon system (Espírito Santo Basin, Brazil). Am. Assoc. Pet. Geol. Bull. 93, 617-652.

    Alves, T.M., 2016. Polygonal mounds in the Barents Sea reveal sustained organic productivity towards the P-T boundary. Terra Nova 28, 50-59. http://dx.doi.org/10.1111/ter. 12190.

    Aydin, A., 2000. Fractures, faults, and hydrocarbon entrapment, migration and flow. Mar. Pet. Geol. 17, 797-814. http://dx.doi.org/10.1016/S0264-8172(00)00020-9.

    Barnett, J.A., Mortimer, J., Rippon, J.H., Walsh, J.J., Watterson, J., 1987. Displacement geometry in the volume containing a single normal fault. Am. Assoc. Pet. Geol. Bull. 71, 925-937.

    Barrère, C., Ebbing, J., Gernigon, L., 2009. Offshore prolongation of Caledonian structures and basement characterisation in the western Barents Sea from geophysical modelling. Tectonophysics 470, 71-88. http://dx.doi.org/10.1016/j.tecto.2008.07.012.

    Baudon, C., Cartwright, J., 2008a. Early stage evolution of growth faults: 3D seismic insights from the Levant Basin, eastern Mediterranean. J. Struct. Geol. 30, 888-898. http://dx.doi.org/10.1016/j.jsg.2008.02.019.

    Baudon, C., Cartwright, J., 2008b. The kinematics of reactivation of normal faults using high resolution throw mapping. J. Struct. Geol. 30, 1072-1084. http://dx.doi.org/10. 1016/j.jsg.2008.04.008.

    Biddle, K.T., 1985. Glossary-strike-slip deformation, basin formation, and sedimentation. In: Biddle, K.T., Christie-Blick, N. (Eds.), Strike-Slip Deformation. Basin Formation and Sedimentation. Special Publications of SEPM, Tulsa, pp. 375-386.

    Breivik, A.J., Gudlaugsson, S.T., Faleide, J.I., 1995. Ottar Basin, Sw Barents Sea: a major Upper Palaeozoic rift basin containing large volumes of deeply buried salt. Basin Res. 7, 299-312. http://dx.doi.org/10.1111/j.1365-2117.1995.tb00119.x.

  • Related Research Results (1)
  • Metrics
    No metrics available
Share - Bookmark