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AAPG Bulletin, V.
Prediction of channel connectivity and fluvial style in the flood-basin successions of the Upper Permian Rangal coal measures (Queensland)
1Fluvial Research Group, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; [email protected]
2Fluvial Research Group, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; [email protected]
3Fluvial Research Group, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; [email protected]
4Chevron Energy Technology Company, 1500 Louisiana Street, Houston, Texas, 77001; [email protected]
5John Collinson Consulting Ltd., Delos, Knowl Wall, Beech, Staffordshire, ST4 8SE, United Kingdom; [email protected]
Predicting the presence and connectivity of reservoir-quality facies in otherwise mud-prone fluvial overbank successions is important because such sand bodies can potentially provide connectivity between larger neighboring sand bodies. This article addresses minor channelized fluvial elements (crevasse-splay and distributary channels) and attempts to predict the connectivity between such sand bodies in two interseam packages of the Upper Permian Rangal Coal Measures of northeastern Australia. Channel-body percent as measured in well logs was 2% in the upper (Aries-Castor) interseam and 17% in the lower (Castor-Pollux) interseam. Well spacing were too great to allow accurate correlation of channel bodies. The Ob River, Siberia, was used as a modern analog to supply planform geometric measurements of splay and distributary channels so that stochastic modeling of channel bodies was possible. The resulting models demonstrated that (1) channel-body connectivity is more uniform between minor distributary channels than between crevasse-splay channels; (2) relatively good connectivity is seen in proximal positions in splays but decreases distally from the source as channel elements diverge; and (3) connectivity tends to be greater down the axis of splays, with more isolated channel bodies occurring at the margins.
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