Abstract
ABSTRACT This paper describes a detailed geological modelling of the Frigg field. The Frigg field is a major North Sea gas reservoir composed of turbiditic sands. It has been in production since 1976. Gas-liquid contact movements, RFT pressure data and petrophysical evaluations have confirmed that the reservoir contains many barriers to vertical flow. A detailed geological mapping incorporating these barriers (shales) was required to simulate the complex field behaviour. For that purpose, a geological model containing sand lobes and intercalating shales has been defined from the seismic and well data. Altogether ten geological units have been interpreted. An extensive shale mapping study has been incorporated into the model. Shales have been classified into two types. The deterministic shales have been defined and mapped along reservoir layer boundaries and have been implemented in the model as horizontal flow barriers. The more discontinuous shales within reservoir layers have been modelled using statistical methods.
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