Structural evolution of the Sele High and Ling Depression

Introduction
The Sele High is a structurally complex area in the Norwegian part of the North Sea affected by at least three phases of extensional tectonics (Figs. 1). Owing to excellent 3D seismic imaging, a multitude of questions can be addressed: Were Devonian sediments within the Sele High deposited in basins resulting from collapse tectonics at the end of the Caledonian orogeny? Can the Ling Depression be linked to basement shear zones mapped onshore Norway? To what degree did the Devonian structural template control later rift events in the Permian-Triassic and Jurassic-Cretaceous? What controlled the distribution of evaporite deposits in the Permian? How did faulting affect the mobilization of evaporites, and how did active fault systems evolve in the presence of salt?

Aims
This project aims at undertaking a structural analysis of a sub-area within the Sele High and Ling depression, linking fault growth with the development of accommodation space and deposition of sediments.
 

Objectives

• Generating a 3D geomodel and seismic stratigraphic framework of the study area through the seismic interpretation of faults and stratigraphic surfaces coupled with data from hydrocarbon exploration wells.
• Generating isopach maps for relevant stratigraphic intervals to e.g. assess syn-sedimentary faulting or distribution of evaporitic rocks.
• Calculating selected fault attributes (e.g. displacement-length, displacement-depth) to inform fault evolution.
• Assessing the role of evaporites in fault development; faults triggering salt diapirism, detachment surfaces in evaporites resulting in non-planar fault geometries and deformation of hanging wall rocks, linkage of fault systems above and below the evaporitic sequence.

Data
This project will put to use public domain high-quality 3D data (LO1101), long-offset 2D data (NSR) and publicly available well data.

Tools and methods
Schlumberger’s Petrel E&P software will be used for seismic interpretation.

Learning outcomes
Understanding the evolution of faults and basins in a tectonically complex area. Knowledge on how to calculate and use fault and horizon attributes. Proficiency in 2D and 3D seismic interpretation using Schlumberger’s Petrel E&P software. Independent academic work and writing. Presenting results.