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Abstract: High Resolution Sequence Stratigraphic Concepts Applied to Geostatistical Modeling

Guy Desaubliaux, Arnaud Pelgrain De Lestang, Remi Eschard, Benoit Didier, Jean Marc Feroul

Lithofacies simulations using a high resolution 3D grid allow to enhance the geometries of internal heterogeneities of reservoirs. In this study the series simulated were the Ness formation, part of the Brent reservoir in the Dunbar field located in the Viking graben of the North Sea.

Simulations results have been used to build the reservoir layering supporting the 3D grid used for reservoir engineering, and also used as a frame to study the effects of secondary diagenetic processes on petrophysical properties.

The method used is based on a geostatistical study and integrates the following data:

- a geological model using sequence stratigraphic concepts to define lithofacies sequences and associated bounding surfaces,

- well data (cores and logs) used as database for geostatistical analysis and simulations,

- seismic data: a 3D seismic survey has been used to define the internal surfaces bounding the units,

- outcrop data: The Mesa Verde formation (Colorado, USA) has been used as an outcrop analog to calibrate geostatistical parameters for the simulations (horizontal range of the variograms).

This study illustrates the capacity to use high resolution sequence stratigraphic concepts to improve the simulations of reservoirs when the lack of subsurface information reduce the accuracy of geostatistical analysis.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France