Between 1985 and mid-1993 estimates of STOUP in the Rob Roy Field varied from 89 mmbbls to 110 mmbbls. In 1993 three well workovers resulted in a significant increase in dry oil production from the field. This increased production could not be history­ matched to the existing simulation model of the field.

This paper summarises the subsequent geoscience and engineering work which has led to a new STOIIP estimate of 143 mmbbls, a significant revision of the field reservoir simulation model, and a substantial increase in estimated oil reserves. These were achieved principally by a reinterpretation of the same geophysical dataset that was available at the time of the Annex B in 1985.

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