--> Abstract: An Integrated Reservoir Modelling Approach to Unravelling Reservoir Complexity in the Enfield Oil Development, Offshore Australia, by Benjamin C. Mee, Laurent Bourdon, Timothy Duggan, Matthew Strika, Megan Smith, and Simon Lang; #90082 (2008)

Datapages, Inc.Print this page

An Integrated Reservoir Modelling Approach to Unravelling Reservoir Complexity in the Enfield Oil Development, Offshore Australia

Benjamin C. Mee1, Laurent Bourdon1, Timothy Duggan1, Matthew Strika1, Megan Smith2, and Simon Lang2
1Development, Woodside Energy, Perth, WA, Australia
2Science and Technology, Woodside Energy, Perth, WA, Australia

Successful management, performance, and recognition of waterflood opportunities rely on an integrated understanding of the geology and scenario modelling of the reservoir. A major factor in undesired waterflood predictions is uncertainty in reservoir heterogeneity. Early production data, development drilling results, and a 4D seismic survey within the Enfield oil development have highlighted more reservoir complexity than expected. This paper presents an integrated approach to reservoir characterisation and seismically-constrained reservoir modelling to support oil production of the Jurassic Macedon Formation sandstones at Enfield.

Enfield, discovered in 1999, is located offshore Western Australia in 500m water depth. Following five appraisal wells, the field was sanctioned for water-flood development in 2004. A total of fourteen sub-sea production, water injection and gas re-injection wells were drilled, with first oil produced in July 2006. A 4D monitor survey was acquired seven months after production in 2007. The Macedon Formation sandstones are characterised as shallow marine deposits and broadly divided into lower (semi-confined) and upper (less confined) packages in an overall transgressing sequence. The reservoirs comprise generally clean, high permeability, friable sandstone containing 22° API, moderate GOR oil overlain by a significant gas cap.

Key geological, petrophysical, geophysical, and early production data were analysed post-development drilling in 2006. Modelling of the resulting geological scenarios was aided by a seismically-constrained reservoir modelling approach to heterogeneity and reservoir property distribution to assess impact of geology on the Enfield waterflood development. These results led to an improved understanding of reservoir architecture and connectivity early in field life.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery