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ABSTRACT: Modeling Previous HitfromNext Hit Sunrise to Sunset and back again: Integrated Previous Hit3-DNext Hit reservoir modeling and Previous HitseismicNext Hit Previous HitinversionNext Hit studies, Sunrise-Troubadour Field, Timor Sea

Ainsworth, Bruce, Bas Spaargaren, Robert Seggie, Peter Stephenson, David Johnson, Jean-Paul Koninx, and Joe Mcnutt , Woodside Energy Ltd, Perth, Australia

The giant Sunrise-Troubadour gas-condensate field is located in the Timor Sea some 450 km Previous HitnortheastNext Hit of Darwin, Northern Australia. Since its discovery in 1974, six wells have been drilled to appraise the structure: the three most recent date to 1997-98. Middle Jurassic (Plover Formation) marginal marine sandstones form the main reservoir. The trap is a broad, approximately 3500 square km, tilted fault block. Information Previous HitfromNext Hit the recent appraisal campaign has been integrated with a grid (1 x 3 km) of modern 2-D Previous HitseismicNext Hit Previous HitdataNext Hit and together they have been used to formulate field development plans. Description of the subsurface relies on a range of discrete Previous Hit3-DNext Hit reservoir modeling scenarios which cover the full spectrum of subsurface uncertainties.

Deterministic and probabilistic modeling of sand and shale bodies has been combined with statistical Previous HitseismicNext Hit Previous HitinversionNext Hit techniques to determine rock properties (thickness, net-to-gross, porosity) in the large, greater than 10 km, interwell areas. An iterative approach was followed whereby depositional geometries Previous HitfromNext Hit initial Previous Hit3-DNext Hit geological models formed the a priori inputs for the Previous HitinversionNext Hit runs. The resulting Previous HitinversionNext Hit property models were then used to update the Previous Hit3-DNext Hit static geological descriptions before transfer to a dynamic simulator.

This sophisticated approach draws Previous HitfromNext Hit all available geological and geophysical information, maximizes integration of these disparate Previous HitdataTop types into a coherent static description of the subsurface, gives confidence to contractible proven gas volumes, and limits the requirement for further expensive appraisal drilling.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia