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Fairley; geological and structural setting

The Fairley accumulations are trapped on the downthrown sides of three parallel down-to-basin growth faults, formed during the progradation of the Baram delta system. In Block 1 and 2 hydrocarbons are found in the A to B sands from 1,450 to 3,100 metres subsea (Early Piacenzian). Blocks 3, 4 and 5 contain hydrocarbons in the B to C sands from 1,680 to 2,770 metres subsea (Late Zanclian to Early Piacenzian) and Block 20 in the P to S sands between 2,360 to 3,050 metres subsea (Zanclian).

Cores from the A, B and C sands are interpreted as fine to very fine, beach, shallow offshore bar and channel sands, ranging from 3 to 40 metres thick, with porosities and permeabilities of 17 to 26% and 10 to 500 mDarcy (0.01-0.5m2) respectively. The reservoirs range in age from Late Miocene in the southern accumulations to Late Pliocene in the northern, reflecting the seaward progradation of the palaeo-Baram coastline.

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