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ABSTRACT: The Sequence Stratigraphic Framework of Late Jurassic Clastic Reservoirs in the Previous HitNorthNext Hit Previous HitSeaNext Hit

PROSSER, SARAH D., University of Edinburgh, Edinburgh, Scotland, M. PARTINGTON, BP, Glasgow, Scotland, and J. UNDERHILL, University of Edinburgh, Edinburgh, Scotland

The distribution of Late Jurassic clastic reservoirs in the Previous HitNorthNext Hit Previous HitSeaNext Hit is highly variable both geographically and stratigraphically. At some horizons, sheet-like sandstones occur; at others, the sandstones form restricted wedges. Furthermore, reservoir units range in age from Callovian to Volgian and represent depositional environments ranging from deltaic to submarine fan. Few attempts have been made to place this variation within a rigorous sequence stratigraphic framework. This matter is now addressed by examining principally seismic reflection, electrical log, and stratigraphic data at both regional and Previous HitfieldNext Hit scale.

The approach was to determine and demonstrate the applicability of a sequence stratigraphic approach to the characterization of reservoir stratigraphy with particular emphasis on sand body geometry and connectivity, by analyzing the occurrence and practical use of marine flooding surfaces and condensed sequences in reservoir zonation and management.

This methodology enables the prediction of the likely configuration and nature of sedimentary facies across synchronous systems tracts at a range of scales, and incorporation of the results to analyze the significance of shaley and condensed horizons. Although the ultimate aim is to investigate the applicability of this approach to Previous HitfieldNext Hit-scale stratigraphy by determining the nature of parasequences and assessing their value in the prediction of reservoir character, the process also leads to more realistic, larger scale paleogeographic scenarios that will have a relevance to the exploration for untested Late Jurassic sandstone plays.

The Ula and Gyda fields in the Norwegian sector of the Previous HitNorthNext Hit Previous HitSeaNext Hit have been selected to illustrate the concepts discussed above. Examples are taken from these fields to demonstrate the excellent potential of developing the techniques of sequence stratigraphy into a powerful tool for correlation of key horizons in reservoir units around the Previous HitNorthNext Hit Previous HitSeaTop area.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)