Webinar: Structural Group afternoon fault lectures
The Structural Geology Network Group invites you to the first lunch & learn after the summer. Alissa Henza and Thomas Berg Kristensen from Equinor will be presenting a series on fault lectures. Don't miss out on this great event.
- Thomas Berg Kristensen, Equinor: ‘’Characterisation of late Jurassic border faults – Insights from outcrop studies, NE Greenland’’
Summary: The conjugate margin of NE Greenland provides a natural laboratory for outcrop insights to what we work with daily in the subsurface of the NCS, with age equivalent rocks and a comparable structural setting. In this presentation we will give an overview of observations and results produced from two field-campaigns to Wollaston Forland, NE Greenland, during 2014 and 2018 as well as a taste of ongoing and future work. With a structural template stemming from the Caledonian orogeny we jump from the scale of the entire East Greenland rift system and focus in on the basin bounding Dombjerg fault, which separates a basement footwall from syn-rift clastics in its hanging-wall. The Dombjerg fault provides insights into timing of fault activity and fault related cementation and can be a valuable analogue with regards to fault seal and N/G estimation around syn-rift faults.
- Alissa Henza, Equinor: Structural Inheritance in Rift Basins: Understanding Complex Fault Geometries and Interactions through Physical Modeling
Summary: We use scaled physical (analogue) models with wet clay to investigate how the properties of a population of pre-existing normal faults influence fault development during a subsequent phase of non-coaxial extension. The orientation of pre-existing normal faults significantly influences (1) the likelihood of fault reactivation, (2) the magnitude and sense of slip of the reactivated faults, and (3) the orientation, number, and length of the new normal faults. In addition, the magnitude of first-phase extension strongly influences the fault geometries that develop during the second phase of extension and the interactions between the pre-existing faults and new faults. Documenting how these fault patterns develop and the controls on deformational patterns is crucial for understanding fluid flow in the subsurface for both hydrocarbon exploration and production and for carbon capture and sequestration (CCUS).
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