The Clair Field lies west of the Shetland Islands on the U.K. continental shelf in 140 m of water (Figure 1).

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The reservoir comprises a thick (about 600 m) succession of fluvial, aeolian, lacustrine, and marginal marine Devonian-Carboniferous clastics. Studies on orientated core and field analog data indicate that Clair contains a complex variety of fracture types, orientations, and scales (Figure 2).

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Of particular importance are the larger, through-going, open conductive fractures. Wells intersecting these fractures are the most productive in the field. Well 206/8-10Z attained maximum flow rates in excess of 10 000 bd, and...

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