Structural and thermal investigation of the Eneabba Region of the Perth Basin, Western Australia.
Jervis-Bardy, N (2010) Structural and thermal investigation of the Eneabba Region of the Perth Basin, Western Australia. Honours thesis, University of Tasmania.
A structural and thermal investigation was undertaken on an area centred on exploration permits currently held by Granite Power Pty Ltd, in the vicinity of Eneabba, in the north Perth Basin using a combination of potential field geophysics, petrophysical and thermal property measurements followed by 1D and 2D thermal modelling.
Petrophysical results show that the Kockatea Shale is the primary thermal insulator within the area of investigation, and 1D modelling of drill holes show that the geotherm is strongly deflected by this unit. The heat generation of basement samples is greater than the sedimentary sequence indicating a possible heat source at depth. Shale samples also exhibit elevated heat generation values.
Gravity data is characterised by large gravitational gradients within the area of investigation, associated primarily with variation in depth to the basement sequence due to major fault structures. Magnetic response of the basin is subdued in a manner consistent with the presence of a thick sedimentary sequence. Forward modelling of the potential field data, constrained by interpreted seismic data, suggests possible changes in lithology within the basement across the area of investigation.
2D finite element modelling of the thermal response of the basin sequence illustrates highest thermal gradients within the Kockatea Shale, and shows a coupling between variations in depth to basement, and depth to isotherms. Models show possible enhanced geothermal system targets within basement rock in the western potion of the area. Hot sedimentary aquifer system targets are also present within the Permian sequence in most of the eastern portion of the area of investigation where the sedimentary sequence is thicker than 4km.
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|Deposited On:||01 Jun 2012 15:39|
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