The first North Sea Oil and Gas Reservoirs Conference was held in Trondheim in 1985 as part of the Norwegian Institute of Technology's 75th anniversary celebrations. Favourable reactions from the delegates prompted the Committee to re-run the event some three and a half years later, and it is now intended that the Confe? rence be held on a regular basis as long as there is a demand for this type of gathering. The objectives of the 1989 Conference, which were broadly similar to those of the previous one, were: (a) to bring together those engaged in various geoscientific and reservoir engineering aspects of North Sea Oil and gas reservoirs in one forum; (b) to demonstrate wherever poSsible the interdependence of the various disciplines and specializations; (c) to promote innovative, synergistic approaches to research and development programmes aimed at North Sea conditions; and (d) to reflect current trends in the reservoir sciences. Naturally there was no place for specialist parallel sessions in a Conference aimed at encouraging interdisciplinary integration and awareness.Field Review 1 The Forties Field and the evolution of a reservoir management strategy.- Field Review 2 Fulmar: the development of a large North Sea field.- Field Review 3 The Tyra Field.- Field Review 4 The Gullfaks Field: geology and reservoir development.- Field Review 5 I. Stochastic modelling of reservoir sand bodies for input to reservoir simulation, Snorre Field, northern North Sea, Norway.- II. Reservoir simulation of the Snorre Field.- Keynote Address 1 Reservoir characterization from crosshole seismic: new directions.- 1 Use of seismic attributes in reservoir characterization.- 2 Experiences gained using a seismic inversion method for detailed reservoir studies.- 3 Some requirements from seismic methods for use in reservoir simulation models.- 4 Stratigraphie processing of 3D seismic by concurrent analysis of surface and borehole data.- 5 Frigg Field reservoir management.- 6 Analysis of fol£%