Block 35/1 with the dry Sturlason structure, is located on the northernmost part of the Marflo Ridge in the Norwegian part of the Northern North Sea. It is separated by deep faults from the Sogn Graben to the east and the Marulk Basin to the west. The 35/1-1 well proved only minor shows of gas and oil in the well. <br>The Sturlason structure comprises a series of upthrown fault blocks in a structurally complex area. Structural backstripping suggests a part of the 35/1 Block to have been sub-aerially exposed during part of the Jurassic. A more oxic environment and greater influx of type III organic matter may have been the result in the area surrounding the island. <br>The geochemical analyses were hampered by contaminations from the use of oil based mud while drilling. Despite this, traces of true indigenous C4-10 and C25+ range hydrocarbon are demonstrated. The former carries the imprint of being an early mature evaporative condensate whereas the latter suggests origin from an early mature hypersaline carbonate related source rock. <br>A buoyancy driven fluid flow study without taking faults into account, shows the difficulty in charging the drilled structure and clearly suggests presence of sealing faults. <br>


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