Fly Lake Field

Fig. 1. Map of the southern Cooper basin showing major structural elements and the location of the Moorari and Fly Lake Fields in the Patchawarra syncline. Cooper basin. Modified from Stuart et al (1988).

A total of 130 core samples from the Tirrawarra Sandstone were collected from 14 wells of the Moorari and Fly Lake Fields. Sedimentological descriptions of the cores were made and samples from rocks deposited in a variety of depositional environments were collected. 

Fig. 3. Example of the different depositional environments and progradational and retrogradational cycles of the Tirrawarra Sandstone in the Moorari and Fly Lake Fields. The gamma ray log trace is derived from the Moorari 9 well.

Tirrawarra Sandstones in the Moorari and Fly Lake Fields consist mainly of medium-grained, moderately sorted sublitharenites (mostly mica schist and phyllite, shale and siltstone clasts) (classification of Folk, 1974). A variety of authigenic minerals are recognized, including syntaxial quartz overgrowths, minor illite, patchy kaolinite and siderite. Attention is focused on the siderite and only a short description of the other diagenetic minerals is provided here. 

Martin, K.R. ( 9iA) Petrology and Diagenesis and Reservoir Quality of the Tirrawarra Sandstone in Tirrawarra Fly Lake and Moorari Fields. Unpublished report, Santos Ltd, 31 pp. 

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