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Martin A. Harvey1, David Wilson2
(1) RDS Resource, Aberdeen, United Kingdom
(2) Amerada Hess Ltd, Aberdeen, United Kingdom

Abstract: Ivanhoe & Rob Roy Fields, UKCS. Adding value from geoscience and engineering

The Ivanhoe, Rob Roy and Hamish oil fields lie in the Moray Firth area of the UKCS. The reservoir is the shallow marine, Middle Jurassic Piper sand in dip and fault closed traps. The fields came on-stream in 1989 and are now in decline with both water injection and gas lift used to optimise production. The reservoir has good permeabilities (5D) and hence a high recovery factor. However, the two main areas of uncertainty were the degree of permeability heterogeneity and the distribution of STOIIP. The performance of the current wells was reviewed against the present model to identify potential modifications and options for new wells in unswept areas. A sedimentary facies and depositional study was used to place the fields in their regional context and to determine spatial controls on permeability distribution. The 3D seismic data were interpreted with the benefit of an AI volume to ensure best placement of faults and horizon picks. The reservoir flow unit zonation revealed a correlation between facies and rock properties and indicated that in some zones the permeability distribution was heterogeneous and likely to be poorly connected. A geo-cellular model was built using a combination of 2D and 3D software tools and passed to the reservoir simulator with both inclined and vertical faults. This workflow permitted rapid iteration between the geo-cellular model and the simulation model to test different distributions of the rock properties. Ultimately the model was used to support well locations, identified in the initial well review.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana