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PLATE 8-1
Left. Mungaroo Formation, Gorgon 1, North-West Shelf, Australia. Scanning Electron
Microscope images. View looking into a pore space between quartz grains (foreground)
showing the large decrease in porosity due to the formation of secondary kaolinite. Depth
3759.7 m.
Right. View of an area dominated by two carbonate minerals, siderite and dolomite. Their
authigenesis has been partly responsible for the low porosity and permeability of the rock.
Depth 3767.4 m. (Reproduced, with permission, from Campbell and Smith, 1982, p. 108,
Plate 2; courtesy of West Australian Petroleum Pty Ltd.)
