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Seal Breach Analysis in the Danish Central Graben
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Hydraulic top seal failure is one of the crucial elements of every working prospect in the Central North Sea that are subject to HP/HT conditions. In the Danish Central Graben, Jurassic and Lower Cretaceous sections of the Danish Central Graben consistently have pore pressures >900 bars and formation temperatures can be up to >150°C. In order to improve the understanding of the pressure regime in the Danish Central Graben, a workflow to map aquifer seal capacity was employed. The aim was to assess the magnitude of effective stress and hence the risk of hydraulic top seal failure. The dataset included 30 wells distributed across the Danish side of the Central Graben, for which key pressure characteristics, as well as vertical and lateral compartmentalization were evaluated. Using these information effective stress maps were calculated for several Jurassic and Lower Cretaceous intervals. The Danish wells included in this current study fit this regionally defined trend implying that overpressure magnitude has some impact on the presence of hydrocarbon prospectivity.