Geology
The field is located in a faulted block of Jurassic and older rocks beneath the Hampshire Basin, close to the steeply sloping monocline in the overlying chalk. The Purbeck Monocline defines the fields southern limit. The field consists of three separate reservoirs known as Bridport, Sherwood and Frome. Bridport, the first discovery, is in the Jurassic Bridport Sands 900 metres (3,000 ft) below Poole Harbour, with an oil source in the Lower Lias. The much larger Sherwood (discovered 1978) is below this in the Triassic Sherwood Sands at 1,600 metres (5,200 ft) and extends under Poole Bay. Frome is in a shelly limestone at 750 metres (2,460 ft). The field extends eastwards from Sandbanks and Studland for around 10 kilometres (6.2 mi) under the sea to the south of Bournemouth.
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