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Data transfer between geologists and reservoir engineers has traditionally been by means of maps of reservoir properties averaged over the whole reservoir or over several reservoir intervals. These averaged descriptions of the reservoir are often adequate to guide decisions concerning early field development (e.g. how many platforms are required to develop a given field) but lack sufficient detail to guide later stage reservoir management when much more information is usually available (Slatt & Hopkins 1988; Weber & van Geuns 1989). At this stage of field development a major problem is the time and manpower required to integrate the available data into a detailed reservoir model (Johnson 1989). Even if such a model is successfully created, all too often the detail present in the model is lost during transfer to reservoir engineering simulators.

Recent developments in data managementtechnology have resulted in the creation of a number of detailed, computer-based reservoir modelling systems (Abib et al. 1988; Pajot et al. 1988; Hastings et al. 1989). The reservoir models generated by these systems may be used as data bases that are accessible to a variety of petroleum engineering disciplinesand constitute a common, multi-discplinarydescription of the reservoir that may subsequently be transferred to reservoir simulators. This methodology represents a significant advance from traditional methods since much more informationis containedwithin these modelsthan in maps of average properties.

This paper discusses the use of workstation-based log manipulation and reservoir modelling software to generate a detailed 3-D model of part of the Brent Group in the

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