--> Abstract: The Metamorphosis of West of Shetland Exploration from Myth to Reality, by Nicholas Loizou; #90072 (2007)

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The Metamorphosis of West of Shetland Exploration from Myth to Reality

Nicholas Loizou
DTI, London, United Kingdom

The discovery of Rosebank/Lochnagar in 2004 has partly dispelled a myth that the west of Shetland (NW of Scotland) is historically an area of low success (21%). Moreover, the analysis of all 139 exploration wells drilled west of Shetland provides a further interesting tale as to why success has been relatively low up to now, but more importantly a reliable insight towards improved future success.
The shrouded belief is that many of the 139 wells were positioned on valid traps. However, post-drill analysis indicates that the majority of the 109 failures (66%) were as result of a poorly defined trap. Intriguingly, only 7% of the wells specifically failed as a result of source rock absence. The majority of the wells were analysed with respect to 3D seismic data, play fairways, the distribution of seal and the understanding of the source kitchen. Not surprisingly, wells positioned on ‘valid traps' have resulted in a success rate greater than 40%. Undoubtedly, this firmly demonstrates a big opportunity to improve the exploration success rate west of Shetland.
The evaluation of proven examples of successful traps like Clair, Foinaven, Schiehallion, Laggan, Rosebank/Lochnagar and also analogues from other parts of the world can add value to successful future exploration. There are no myths or mystery in the creation of a valid hydrocarbon trap but understanding of the key components that constitute a successful geologic trap is fundamental. An improved understanding will almost certainly create a greater chance of finding commercial hydrocarbons.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece