Abstract
Surficials **l ediment samples collected from below the production platforms in the Buccaneer oilfield contain up to 25 ppm of petroleum alkanes. On one occasion, concentration gradients of fresh oil were observed below both platforms, extending at least 75 ft. (22.9 m) from the platforms. On another occasion, the oil was more weathered and dispersed. There was no clear evidence for similar-profiIes in the vicinity of a well jacket structure, and alkanes in sediment samples collected at distances of 0.7-l 1 .O km from the production platforms were mostly of recent biogenic origin.
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