What is it about?
We've looked at the relationship between surfaces developing in front of deltas and their associated delta tops as they progressively developed in a relatively shallow marine basin offshore northern Norway during the Middle Triassic. This study has been made possible by the use of 2D and 3D seismic, well log and core data which offer insight into the subsurface sedimentary succession.
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Why is it important?
Deltas are known to be agents for depositing porous sandstone which may later become reservoir rocks. Understanding how they develop and their preservation potential after they've formed is therefore very important. The present study offer unique insight into the formation and evolution of a mud-rich delta system by integrating different datasets over a large area. This information can be used to guide interpretations of similar systems in different basins around the world, but specifically it shows why these intervals should be avoided in future exploration efforts in the Norwegian Barents Sea.
Perspectives
Clinoforms and their topsets have long been regarded as potential hydrocarbon reservoirs in the Norwegian Barents Sea, but few studies had actually evaluated the sedimentological character and implicitly the potential that these intervals hold as potential reservoir rocks. With this study we have shown that clinoform geometries earlier interpreted using conceptual models suggesting possible reservoir rocks within the interval, are better explained with natural changes in the basin that does not suggest increased potential for reservoir rocks. This play model should from now on be discarded in the Barents Sea basin.
Tore Klausen
Universitetet i Bergen
Read the Original
This page is a summary of: Clinoform development and topset evolution in a mud-rich delta - the Middle Triassic Kobbe Formation, Norwegian Barents Sea, Sedimentology, December 2017, Wiley,
DOI: 10.1111/sed.12417.
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