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Block 16/17 is located in the U.K. sector of the South Viking Graben. Three oil fields in the block produce from the Upper Jurassic Brae member of the Kimmeridge Clay Formation, the most southerly of which is the Thelma field. The reservoir comprises a deep marine fan complex dominated by conglomerates, sandstones, and thin-bedded turbidites.

The simple Base Cretaceous unconformity structure belies the complex internal field stratigraphy. Isochore mapping reveals second-order structures within the hanging wall at the Top Middle Jurassic that have created a complex Late Jurassic depocenter into which the Upper Jurassic sediments accumulated.

Facies mapping shows a clear correlation between net-to-gross (NTG) and thickness. Mapping has revealed two Brae member fans; a northerly Thelma fan and a southerly Southeast Thelma fan. The intervening Central region high is characterized by low NTG facies resulting from bypass of coarse sediment into the adjacent Thelma and Southeast Thelma fairways.

Three contrasting depositional concepts have been interpreted from static and dynamic data. In Concept A, the Thelma and Southeast Thelma Brae fans are essentially separate. The compaction-related bathymetric low between them formed the depocenter for the later sand-shale member deposition. In Concept B, the Brae depocenters are linked, creating a continuous fairway in which sediment is supplied axially from Thelma to Southeast Thelma. In Concept C, which is the favored concept, the Thelma and Southeast Thelma Brae member depocenters are also linked, but in this case, the Southeast Thelma fan is fed directly by flows radiating out from the Thelma fan entry point across the Central region.

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