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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/03022019160
Multiphase activation of the boundary
fault
system of the eastern Dampier subbasin, Northwest Shelf of Australia
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Hongdan Deng,1 Ken McClay,2 and Awad Bilal3
1College of Marine Science and Technology, China University of Geosciences, Wuhan, China; Fault
Dynamics Research Group, Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; [email protected]
2Australian School of Petroleum and Energy Resources, University of Adelaide, Adelaide, South Australia, Australia; Fault
Dynamics Research Group, Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; [email protected]
3Department of Earth Sciences, Faculty of Science, University of Benghazi, Benghazi, Libya; Fault
Dynamics Research Group, Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; [email protected]
ABSTRACT
Investigating the timing, structural style, and development of multiphase extensional fault
systems is essential for understanding rift basin evolution and for assessment of structural trap integrity. Borehole-controlled interpretation and analysis of two-dimensional and three-dimensional seismic data sets from the eastern Dampier subbasin indicate that a northeast-trending basement weakness zone was subjected to west-northwest–east-southeast oblique extension in the latest Triassic–late Middle Jurassic, resulting in systematic segmentation of the Rosemary
fault
system (RFS). Temporal stress change during Cretaceous north-south extension produced complex
fault
systems along the RFS, including (1) east-west–trending isolated faults with maximum displacement close to their center; (2) east-west–trending abutting faults, which initially nucleated as isolated faults, later abutted against the main structure, showing large displacement accruement on the composite
fault
; and (3) northeast-southwest–trending splay faults characterized by systematic left-stepping segmentation, with maximum displacement occurring at the point where the splay faults deviate from the main structure. In the Miocene, the RFS was locally reactivated by northwest-southeast compression in the northeastern part of the
fault
system, developing a compressive
fault
-propagation fold at the upper tip of the inverted extensional
fault
. This study suggests that the style of basin boundary
fault
reactivation depends largely on preexisting structures and temporal stress changes. The
fault
reactivation style is also a significant factor in influencing basin architecture, sediment distribution,
fault
linkage processes, and petroleum basin prospectivity.
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