Interpretation of Upper Jurassic sandstone in the area between Statfjord and Tordis field, Northern North Sea

Abstract

The study area is located in the half graben between the Statfjord field and the Vigdis development on the Tampen Spur, northern North Sea. The petroleum systems in the central and northern North Sea are mainly Jurassic-sourced. The Late Jurassic sandstones are one of the major reservoirs in the study area and formed during the Late Jurassic rifting as syn-rift sediment which also formed syn-rift plays. The sedimentary source came from erosion of the footwall exposed during the rifting event, and the source directions are north and east. Late Jurassic was the time of the widespread Kimmeridge Clay Formation that constitutes a world class of oil source rock. Late Jurassic reservoirs are very good potential petroleum plays which can be seen form the oil fields in the northern North Sea. This thesis will focus on the Late Jurassic sandstone in the Draupne Formation of Viking Group. The depositional environments of the Late Jurassic sandstones are shallow-marine system and deep-marine fan system. The interpretation of the Late Jurassic sandstones is based on well data and seismic data. Two methods of surface attribute are used to interpret the sandstone in the seismic data. The analysis of the Late Jurassic sedimentary model is very important for the exploration process in this area. The result of this thesis would support exploration decision in the future.