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Ahead of Print Abstract
DOI:10.1306/04162423063
Exploring for unswept gas: Integrating reservoir models, production data and fault
seal
analysis in the Northern Carnarvon Basin, Australia
David Kulikowski1 and Alexander G. Robson2
1 Principal Production Geoscientist Woodside Energy, 1500 Post Oak Blvd, Houston, Texas, 77056, USA
2 Principal Technical Authority of Structural Geology Woodside Energy, 11 Mount Street, Perth, WA, 6000, Australia
Ahead of Print Abstract
Oil and gas production can be enhanced by fine tuning wells, using enhanced recovery techniques, or identifying and accessing unswept hydrocarbon compartments. The latter of these can add significant value but is difficult to constrain, particularly in complex geological settings with limited production data. Using working examples from the Northern Carnarvon Basin, Australia, a better understanding of the dynamic behaviour of four gas fields is constrained by utilising a holistic approach that integrates production data analysis techniques, three-dimensional seismic data interpretation, detailed reservoir modelling, and fault
seal
analyses. Four infill well opportunities targeting 500 – 600 Bcf (14 – 17 Bm3) of unswept gas were identified. Additionally, historical infill well locations (pre-production) were re-evaluated and shown to not be viable in the context of the current production data. The examples highlight the complexity in constraining the drainage area of wells and how a holistic approach using multidisciplinary datasets and cutting-edge modelling software capability is vital for effective evaluations. A key outcome is the ability to make more informed decisions through a better understanding of risks, uncertainties, and remaining gas volumes. The fit-for-purpose methodology derived from this work will be replicated in other producing oil and gas fields and incorporated into future prospect evaluations.
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