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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2006. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/06200605195
A new model for assessing
trap
integrity and oil preservation risks associated with postrift fault reactivation in the Timor Sea
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Anthony Gartrell,1 Wayne R. Bailey,2 Mark Brincat3
1Commonwealth Scientific and Industrial Research Organization Petroleum, ARRC, 26 Dick Perry Ave., Technology Park, Kensington, Perth, WA 6151, Australia; [email protected]
2Commonwealth Scientific and Industrial Research Organization Petroleum, ARRC, 26 Dick Perry Ave., Technology Park, Kensington, Perth, WA 6151, Australia; present address: Woodside Energy Limited, 240 St Georges Tce, Perth, WA 6000, Australia
3Commonwealth Scientific and Industrial Research Organization Petroleum, ARRC, 26 Dick Perry Ave., Technology Park, Kensington, Perth, WA 6151, Australia
ABSTRACT
Based on comparisons between structural
histories and the distribution of current and paleo-oil accumulations, it is proposed that the partitioning of postrift strain between faults in relation to
trap
geometry was critical in determining oil preservation during Neogene fault reactivation in the Timor Sea. Most of the
trap
-bounding faults in the region have been reactivated; however, the distribution of postrift displacements is heterogeneous and depends heavily on rift-phase fault size, location, and interaction with nearby faults. Preferential localization of postrift strain onto larger faults in the population resulted in the partial protection of some fault-bound traps with favorable geometries, but promoted breaching of others. Oil columns tend to be preserved where the crest of the
trap
is bound by a fault segment that has accommodated relatively low postrift displacements (less than about 60 m [196 ft]) during reactivation, typically where smaller rift faults are overlapped by larger rift faults. Complete loss of oil column is generally observed where the crest of the
trap
is bound by a typically large fault with high postrift displacements (greater than about 60 m [196 ft]). Where faults with high postrift displacements are located downdip of the
trap
crest, hydrocarbon columns are preserved down to the depth of the intersection between this fault and the top reservoir horizon. A simple
trap
integrity model based on these observations was found to be largely consistent with a database of 69 drilled traps in the region. The mechanisms and models discussed in this study are likely to apply to other petroleum systems where fault reactivation represents a risk to hydrocarbon preservation.
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