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GDE Mapping Leading to Play Analysis in the onshore Otway Basin (SA)
Thursday, 30 May @ 12:00 pm - 2:30 pm (Australia/Adelaide time)
$25.00 – $75.00
Guest Speaker(s): Chris Cubitt (Guest Speaker) and Paul Strong (Co-author)
Dr Chris Cubitt
Dr Chris Cubitt graduated from the University of Adelaide with a PhD in diagenesis and sedimentology. He has more than two decades of industry experience in reservoir and regional geology working basins worldwide. Chris has given public and inhouse industry courses on GDE-based play analysis, rock typing (drill cuttings) and given numerous core workshops including most recently, for PESA and APPEA, in 2023/2024 on cores in the Otway and Cooper Basin (SA). In 2021 he joined Geoscience Australia’s offshore Otway team as a Senior Basin Analyst and most recently started with South Australia’s Department for Energy and Mining (DEM) as a Team Leader of the Basin Prospectivity team. Chris is an author of more than 20 publications, is a member PESA, IAS and the EAGE.
Paul Strong
Paul Strong is a geologist with over 35 years of oil and gas industry experience. He is Chief Petroleum Geologist at the SA Department for Energy and Mining in Adelaide, after holding a range of senior technical and managerial positions with Santos Limited for nearly 23 years. He has an in-depth understanding of many major petroleum basins, in particular the Cooper and Eromanga Basins onshore Australia and the UK North Sea. His experience includes prospect generation, drilling operations, reserve/resource estimation and full cycle economics.
Paul holds a BSc (Hons) in Geology from the University of Durham (UK) and an MSC in Petroleum Exploration Studies from the University of Aberdeen (UK). Prior to joining Santos he worked for Agip (UK) Limited and Chevron Europe Limited as a geoscientist.
GDE Mapping Leading to Play Analysis
in the onshore Otway Basin (SA)
Chris Cubitt (speaker) & Paul Strong
Geological Survey of South Australia, Department for Energy and Mining
http://www.energymining.sa.gov.au/
chris.cubitt@sa.gov.au; paul.strong@sa.gov.au
The Otway Basin is a Mesozoic rift basin located in southeastern South Australia and southwestern Victoria, as well as extending offshore as part of Australia’s Southern Margin. Over 100 petroleum wells have been drilled since the 1890s wells, and in 1987 Katnook 1 discovered economic gas in the Penola Trough, with subsequent drilling leading to further discoveries and construction of a processing plant. To date almost 450,000 barrels oil and 86Bcf of gas have been produced from the basin.
The modern Katnook Gas Plant (currently mothballed) has improved the economic viability of small gas discoveries to fuel both local gas markets and electricity generation. The SA Otway Basin is strategically connected to local southeast and statewide natural gas customers by the SEA Gas and SESA pipelines.
As part of a larger petroleum systems modelling (PSM) project gross depositional environment (GDE) maps were developed using 7,965km of interpreted 2D seismic, interval-specific isopachs with well log motifs, regional seismic facies analysis and depositional environment (DE) interpretations from 772m of conventional core (23 wells). This mapping interpreted varied depositional systems, including anoxic, extensive ice-influenced lacustrine, lacustrine turbidite, extensive fluvial/lacustrine, fluvial/flood plain and growth fault-bound ribbon-like alluvial fan apron environments. GDE maps were produced for the following six key intervals: Casterton Formation, Lower Sawpit Shale (McEachern), Sawpit Sandstone, Upper Sawpit Shale, Pretty Hill Sandstone and Laira Formation.
The petroleum systems modelling showed for the first time significant oil and gas generation and expulsion in the lightly explored Robe and Tantanoola Troughs, as well as the Penola Trough.
Play analysis has recently been conducted by DEM for all 8 intervals using the GDE mapping and the PSM results, with the intention of stimulating exploration for hydrocarbons in this region, including determining areas for a potential acreage release in 2024. The results have been documented on the DEM Energy Resources website under the Geology and Prospectivity
Event Details:
Thursday, Thursday 30th May 2024
Luncheon: 12 pm for a 12:30 pm start
Place: Ayer’s House, 288 North Tce, Adelaide
Includes a 2-course lunch and drinks
Bookings close 1 pm Monday, 27th May 2024
Any late bookings will incur an additional $20 fee. Strictly no walk-ins.
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