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Abstract

AAPG Bulletin, V. 83 (1999), No. (June 1999), P. 925-951.

Characterization of Previous HitFaultNext Hit Zones for Reservoir Modeling: An Example from the Gullfaks Field, Northern North Sea1

G. Yielding,2 J. A. Øverland,3 and G. Byberg4
 

©Copyright 1999.  The American Association of Petroleum Geologists.  All Rights Reserved

1Manuscript received July 24, 1997; revised manuscript received November 4, 1998; final acceptance December 4, 1998.
2Badley Earth Sciences Ltd, North Beck Lane, Hundleby, Spilsby, Lincs PE23 5NB, United Kingdom; e-mail: [email protected]
3Norwegian Petroleum Directorate, Prof. Olav Hanssensvei 10, N-4001 Stavanger, Norway.
4Norwegian Petroleum Directorate, Prof. Olav Hanssensvei 10, N-4001 Stavanger, Norway. Present address: Statoil, 4035 Stavanger, Norway.

We are grateful to members of the PL050/050B license group, headed by Statoil as operator, for permission to publish this study, although the views expressed here are ours and not necessarily those of Statoil or the license partners. We are grateful to Eva Halland of Norwegian Petroleum Directorate for the impetus to publish this work. We also thank Jonny Hesthammer, Rob Knipe, Donald Stone, John Berry, and Glen Cayley for their constructive comments on earlier versions of this manuscript. 
 

ABSTRACT

A Previous HitfaultNext Hit-seal study was performed for part of the Gullfaks field (North Sea) as an aid to improve reservoir management of this complexly faulted structure. The operator's (Statoil) map data were used to build a three-dimensional model of the Previous HitfaultNext Hit network. Together with petrophysical logs, this model was used to compute the variation of Previous HitfaultNext Hit-seal potential (shale gouge ratio or Previous HitfaultNext Hit-zone percent shale) on each Previous HitfaultNext Hit surface.

Pressure data from exploration and production wells have been projected onto the modeled Previous HitfaultNext Hit surfaces. The preproduction pressure differences at sealing faults (separating different hydrocarbon columns) provide information about the capillary seal at the faults. Across-Previous HitfaultNext Hit pressure drops at particular times during production also have been displayed. These dynamic pressure drops provide a guide to the permeability of the Previous HitfaultNext Hit zones after flow has started.

The calculated Previous HitfaultNext Hit parameters (displacement and shale gouge ratio) can be converted to Previous HitfaultNext Hit-zone thickness and permeability and can be used to derive Previous HitfaultNext Hit transmissibility modifiers for reservoir simulations. Maps have been produced showing reservoir juxtaposition areas and calculated Previous HitfaultTop permeabilities along faults throughout the study area. These parameters are compatible with the recorded pressure history and tracer movement between wells, and will enable key reservoir management decisions to be tested and optimized. 

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