Abstract
Abstract The Glamis oilfield lies within UK block 16/21a, 140 miles off the northeast coast of Scotland. The structure has the general form of an east-west oriented tilted fault block. The reservoir consists of clean sandstones of Late Kimmeridgian to Volgian age, overlain by the Kimmeridge Clay Formation but effectively sealed by Cretaceous marls. The sandstones were deposited directly on the eroded Devonian surface as the result of a late Jurassic marine transgression from the southwest. The reservoir is subdivided into four facies: a basal conglomerate (unit 2b); an overlying fine- to medium-grained sandstone of shallow marine nearshore origin (unit 2a); a succeeding facies of coarsening upwards sandstones of barrier bar origin (unit lb), and an uppermost localized silty bar-flank transitional facies (unit la). Units 2a and lb constitute most of the reservoir section, having an average porosity of 15% and permeabilities up to 1.5 Darcies. Glamis contains recoverable reserves of 17.5 MMBBL of 41.5° API undersaturated oil with an initial gas/oil ratio of 1037 SCF/STB. Oil production is from two wells, 16/21a-6 and 16/21a-8, with reservoir pressure maintained by water injection in well 16/21a-17z. Dedicated flowlines exist from each of the producers to a manifold on the Balmoral floating production vessel 4 miles northeast of Glamis.
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