A seismic investigation into the geometry and controls upon alluvial architecture in the Walloon Subgroup, Surat Basin, Queensland

Shields, D., Bianchi, V. and Esterle, J. (2017) A seismic investigation into the geometry and controls upon alluvial architecture in the Walloon Subgroup, Surat Basin, Queensland. Australian Journal of Earth Sciences, 64 4: 455-469. doi:10.1080/08120099.2017.1312524


Author Shields, D.
Bianchi, V.
Esterle, J.
Title A seismic investigation into the geometry and controls upon alluvial architecture in the Walloon Subgroup, Surat Basin, Queensland
Journal name Australian Journal of Earth Sciences   Check publisher's open access policy
ISSN 1440-0952
0812-0099
Publication date 2017-04-30
Sub-type Article (original research)
DOI 10.1080/08120099.2017.1312524
Open Access Status Not yet assessed
Volume 64
Issue 4
Start page 455
End page 469
Total pages 15
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract
he sedimentology of the Walloon Subgroup (WSG) has been extensively studied; however, gaps exist in our understanding of the succession's alluvial architecture and the mechanisms controlling its complex internal organisation. Successful coal-seam gas development in the Surat Basin requires the construction of predictive facies models, which in turn necessitates a fulsome understanding of the geometry and controls on the spatial and temporal distribution of alluvial sub-environments. To improve our models of WSG facies, this study employs an open-source high-resolution 3D seismic dataset available on the western limb of the Surat Basin. Integration of core, wireline and seismic data has resolved the geometries of four discrete alluvial architectural elements, representing simple channel, channel belt, crevasse splay complexes and peat-mire sub-environments. Channel belts were found to be 1600–2000 m wide, simple channels 400–800 m in width and crevasse splays averaging 3.5 × 5.5 km. Coal bodies mapped from seismic attribute extractions were found to be 4.2 km2 on average. The high-resolution dataset has also yielded insight into the geological controls governing the spatial and temporal distribution of these sub-environments, explaining, in part the mechanisms responsible for the complex internal distribution of facies within the WSG. In places within the study area, the WSG's sedimentary organisation appears to be initiated by the rejuvenation of deep-seated tectonic features, the expression of which is propagated upward via the mechanics of compensational stacking.
Keyword Coal measures
Compensational stacking
Differential compaction
Seismic facies
Surat Basin
Walloon Subgroup
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Earth and Environmental Sciences
 
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