Publication Name: The Sedimentary Basins of WA
Authors: John D. Gorter, Arthur Mory and Robert S. Nicoll
Publication Volumne: 2
Date Published: December 1998
Number of Pages: 31
Reference Type: Book Section
Abstract:This new interpretation of the facies relationships within the Nannyarra, Gneudna and Munabia formations illustrates the distribution of source, reservoir and seal within the latest Middle and lower Upper Devonian (latest Givetian to Famennian) sequences of the Carnarvon Basin. Well correlation, interpreted in a sequence stratigraphic context using revised and some new palaeontological dating, identify six sequences, but the sparsity of well penetrations and lack of modern dating, wireline logs and high quality seismic profiles make definitive correlations difficult.
Thin shale beds with excellent source-rock characteristics in the Gneudna Formation (Sequences 1 and 2), overlain by vuggy and dolomitised limestones of the Point Maud Member (Sequences 1 and 2), provide an attractive reservoir target should a suitable seal be present. Conodont colour indices show that any source beds within the Upper Devonian sequences are not too mature for liquid petroleum generation and preservation.