Wednesday, February 6, 1:00pm

Miss Gillian E. Adshade

PhD Candidate, NCPGG, The University of Adelaide

Sealing Properties of Cretaceous Regional and Intraformational Seals of the Carnarvon Basin, Northwest Shelf, Australia, with Applications to Risk Assessment  


Seal evaluation is an integral part of the exploration process, and a key uncertainty facing explorers in both offshore and onshore Australian Basins. This study is a multi-scale approach to the evaluation of sealing properties on the Muderong Shale, the regional seal of the Carnarvon Basin, as well as intraformational seals within the Early Cretaceous Barrow Group.

The study will focus on the four main components of top seal potential: seal capacity (maximum height of hydrocarbon column the seal can support - Hmax), seal integrity (geomechanical properties of the seal), lateral extent and thickness of the seal. The regional variability of the sealing properties of the Muderong Shale and intraformational Barrow Group seals will be integrated with depositional, compactional and diagenetic histories, sequence stratigraphic analysis and petrophysical characterisation.

An additional component to this research will involve the development of a new methodology to more accurately and quantitatively assess top seal risks. By comparing the risk analyses determined in this study to historical exploration data of the Carnarvon Basin, the application of this methodology can be assessed.

Biography of the Speaker

Gillian Adshade completed her Bachelor of Science (Honours) in the field of Earth Sciences at the University of Queensland in 2000, specialising in sedimentology, stratigraphy and volcanology. She commenced her Ph.D. at the National Centre for Petroleum Geology and Geophysics in October 2001 as part of the APCRC Program 1 - Hydrocarbon Sealing potential of Faults and Cap Rocks.