--> Abstract: Regional Approach to Solve Structural Complexity and Cataclastic Fault Seal, Southern North Sea, by Herald Ligtenberg; #90124 (2011)
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Making the Next Giant Leap in Geosciences
April 10-13, 2011, Houston, Texas, USA

Regional Approach to Solve Structural Complexity and Cataclastic Previous HitFaultNext Hit Seal, Southern North Sea

Herald Ligtenberg1

(1) Shell E&P, Assen, Netherlands.

The southern part of the North Sea is a very mature basin, with exploration and production for ca. 40-50 years. Many fields have reached their end-of-field-life and new hydrocarbon discoveries are needed to extend the life of existing infra-structure. The remaining prospectivity is small in volume, difficult to drill and/or at relatively high exploration risk. The volumes in structures could be larger in case a longer hydrocarbon column is kept in place by Previous HitfaultNext Hit seal.

Predicting Previous HitfaultNext Hit seal in this area is not straightforward: 1) the region has a long and complex tectonic history with several phases of extension and compression under different main stress orientation; 2) the region has structural complexity due to the interaction of four different Previous HitfaultNext Hit systems; 3) the Permian Rotliegend reservoir has high N/G and requires sand-on-sand (cataclastic) sealing faults, being difficult to determine its seal strength. However, proven cataclastic Previous HitfaultNext Hit seal exists in places, with across-Previous HitfaultNext Hit pressure difference up to 200 bar.

Especially burial depth, temperature, Previous HitfaultNext Hit movement, palaeo-stress directions and orientation of faults are critical elements for cataclastic Previous HitfaultNext Hit seal. Integration with basin modeling and geochemistry, field data, accurate Previous HitfaultNext Hit interpretation, a regional approach to understand the regional context and interaction of different Previous HitfaultNext Hit systems, and incorporation of the structural evolution in Previous HitfaultNext Hit seal analysis are therefore required. This approach highlights weak Previous HitfaultNext Hit sections that form potential spill points, and highlights which Previous HitfaultNext Hit segments are sealing or leaking.

The extensive Previous HitfaultNext Hit seal study led to renewed insights in the Previous HitfaultNext Hit seal mechanism in the area, and resulted in several successful new discoveries with additional hydrocarbon column related to cataclastic Previous HitfaultTop seal. The results have extended the production of hydrocarbons in the area for a number of years. It illustrates that a new and structured approach with full integration of disciplines can open new opportunities in a very mature basin.