--> Production Constraints on the Sequence Stratigraphic Correlation of the Beryl Formation, Beryl Embayment, Viking Graben, UKCS, by J. Crane, A. Hartley, and G. Maxwell; #90986 (1994).

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Abstract: Production Constraints on the Sequence Stratigraphic Correlation of the Beryl Formation, Beryl Embayment, Viking Graben, UKCS

John Crane, Adrian Hartley, Gregor Maxwell

Correlation within Middle and Upper Jurassic shallow marine sandstone reservoirs in the North Sea is largely based on lithostratigraphy with recent work combining sequence stratigraphy and quantitative biostratigraphy. However, the resolution of these techniques may not be sufficient to adequately define and zone reservoir flow units and assess sweep efficiency at the field development scale.

The utilization of extensive pressure and production data from the Middle Jurassic deltaic/shallow marine reservoir of the Beryl Field has allowed high resolution zonation of the reservoir into 16 zones. Zones are correlatable across a series of tilted fault blocks throughout the Beryl `B' area. Sequence-scale correlation is based on the recognition of regional permeability barriers (shales) with refined zonation at the parasequence scale based on detailed evaluation of dynamic reservoir engineering data, log character and lithostratigraphy. Parasequence boundaries are defined either by shales or carbonate-cemented zones which may act as important permeability barriers or by marked changes in reservoir quality that significantly affect flow/injection profiles in the reservoir.

Parasequence stacking patterns are used to define progradational and retrogradational systems tracts bounded by erosional unconformities or regional flooding surfaces which can be either eustatically and/or tectonically generated.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994