Reservoir quality characterization and prediction of deeply buried clay coated sandstones on the NCS, Examples from the South Western Barents Sea and Northern North Sea
2022
Hansen, Henrik Nygaard
In recent years, petroleum exploration that utilizes existing infrastructure to save time, cost and lower production related C02 emissions have become more important. This strategy require more emphasis on deeply buried prospects which call for a thorough understanding of geological processes that affect reservoir quality distribution in deeper parts (> 2.5 km) of the subsurface. This doctoral work focuses on the characterization of clay coats in reservoir sandstones, a feature important for persevering high reservoir quality in deeply buried reservoirs. The main findings of this doctoral study include: The morphological characteristics of clay coats have important implications for reservoir quality heterogeneity. Integrating historical core data with a ML-based workflow can effectively aid reservoir quality delineation at a regional scale in new un-cored wells or intervals. Simple lab experiments can be key to unlock the controls on how clay coats form on the surface of sand grains. Results from this doctoral study indicate that the clay-coat formation is controlled by electrokinetic properties of the multicomponent mixtures.
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