Perth Basin

About this study area

The Perth Basin is an elongate north-south trending rift basin, covering ~172,000 kilometres of onshore and offshore Western Australia. This rift basin formed during the Permian to early Cretaceous, in relation to the breakup of Gondwana, and separation of Australia from Greater India. Basement structures strike predominantly north- to north-west and are shown to influence the orientation of structures in the overlying sediments. The stratigraphy varies significantly from north to south, with the major petroleum province of the Northern Perth Basin the focus of greatest exploration.

Regional Structural Permeability Maps

These maps present three potential permeability maps based on shallowly, intermediate, or steeply dipping faults.

Shallowly Dipping Faults

This permeability map uses the FAST geomechanical risking method to determine the permeability likelihood of faults assumed to have shallow dip angles.

Moderately Dipping Faults

This permeability map uses the FAST geomechanical risking method to determine the permeability likelihood of faults assumed to have moderate dip angles.

Steeply Dipping Faults

This permeability map uses the FAST geomechanical risking method to determine the permeability likelihood of faults assumed to have steep dip angles.

Further Data

In addition to FAST fault maps, we also present maps of FAST geomechanical risking of fractures identified in 3D seismic surveys, and wellbore image logs.

Seismic Survey Fracture Maps

Fractures and sub-seismic scale faults were identified using a variety of seismic processing methods at ~3 km depth in the Denison 3D seismic survey. These structures were then geomechanically risked to test their reactivation likelihood using FAST.

Wellbore Image Log Data

Resistivity image logs produce a pseudo-image of the wellbore wall, allowing for the identification of fractures, both resistive (closed), and conductive (open). These can then be plotted on a FAST reactivation likelihood plot.