Geothermal Energy Potential in Selected Areas of Western Australia ...

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23 1996 3 ) suggesting that the formation is syn-depositional and associated with the growth of the Darling Fault. The Nangetty Formation is absent on the Beagle Ridge and at least the western portion of the Cadda Terrace. It is therefore possible that thickness variation in the Nangetty Formation may be considerable. However based on available data, it is probable that the Nangetty Formation is relatively thick and reaches a maximum thickness in the hanging wall adjacent to basin controlling faults. In summary, whilst there is some uncertainty in the thickness and distribution of nonintersected formations within the Perth Basin, HDRPL has used all available data to make reasonable assessments on a regional scale to reduce this risk. Figure 4.1 HDRPL seismic interpretation of line A89-708. Vertical scale is in two-way-time. Basement and the Permian sections are beyond the seismic penetration west of the Urella Fault. Line location is shown on Figure 3.2. www.hotdryrocks.com
24 4.7. Estimating basement heat generation HDRPL was requested to comment on the heat generating capacity of basement for all 250 wells (including previously studied) . Heat generation can only be accurately determined from the analytical measurement of Uranium, Thorium and Potassium within rock samples. As it is neither feasible or possible t o obtain basement samples for all 250 wells for analytical measurement, HDRPL has assessed the heat generation of rocks within and adjacent to the Perth Basin using available data from the Geoscience Aust ralia (GA) geochemical data base (Ozchem). Heat gene ration calculated from these samples has been incorporated into the 1D heat flow models for this study. Limited geochemical data are available for the Perth Basin (4 samples). Additional samples from the Northampton Complex and western portion of the Yilgarn Craton have been included, assuming that similar rocks may partly comprise the basement of the Perth Basin. Heat generation (µW/m 3 ) for each sample was calculated using an assumed rock density and the isotopic abundance method as described in Beardsmore and Cull (2001) 9 . Individual results for granites, gneiss and sedimentary rocks are listed in Attachments H, I and J, respectively. A summary of heat generation results for granite, gneiss and sedimentary rock samples in and adjacent to the Perth Basin is shown in Table 4.3. The data suggest that, whilst there are some high values, on the whole the uranium content of granites, gneiss and sedimentary rocks in and around the Perth Basin is not greatly elevated. The resulting heat generation values for granite are largely consistent with, or slightly above, global average (Beardsmore and Cull, 2001 9 ) but are below those described for the Cooper Basin of South Australia (~10 mW/m 3 , McLaren et al., 2003 12 ). This assessment may change with further geochemical sampling of basement rocks in the Perth Basin, and HDRPL recommends that the DoIR further investigate the heat generation potential of rocks. 12 McLaren S, Sandiford M, Hand M, Neumann N, Wyborn L and Bastrakova I (2003). The hot southern continent: heat flow and heat production in Australian Proterozoic terranes. Geological Society of Australia Special Publication 22, pp 151-161. www.hotdryrocks.com
Page 1 and 2: Hot Dry Rocks Pty Ltd Geothermal En
Page 3 and 4: • The distribution of heat flow v
Page 5 and 6: 2 List of Figures Figure 2.1 Strati
Page 7 and 8: 4 1. Introduction The Department of
Page 9 and 10: 6 inverted Permian half graben in t
Page 11 and 12: 8 Figure 2.2 Basin subdivisions and
Page 13 and 14: 10 east. The major sub-basin in the
Page 15 and 16: 12 Figure 3.1 Gravity image with OZ
Page 17 and 18: 14 Figure 3.3 Gravity image with OZ
Page 19 and 20: 16 4. Heat flow modelling methodolo
Page 21 and 22: 18 circulation. The accuracy of the
Page 23 and 24: 20 Table 4.1 Summary of rock therma
Page 25: 22 column. OZ SEEBASE depth-to-base
Page 29 and 30: 26 5. Heat flow modelling results 5
Page 31 and 32: 28 data requires a positive error m
Page 33 and 34: 30 The Dongara Field has 28 wells t
Page 35 and 36: 32 Figure 5.5 A bivariate plot of a
Page 37 and 38: 34 Figure 6.1 Inferred and gridded
Page 39 and 40: 36 Figure 6.3 Inferred and gridded
Page 41 and 42: 38 7. Stress field in the Perth Bas
Page 43 and 44: 40 King et al. (2008) 14 reported s
Page 45 and 46: 42 Regional Shmax Figure 7.2 Major
Page 47 and 48: 44 7.5. Recommendations for Stress
Page 49 and 50: 46 • Examine evidence for coal di
Page 51 and 52: 48 56 Dongara 25 W001065 DEV N GDA9
Page 53 and 54: 50 Attachment B: 80 wells previousl
Page 55 and 56: 52 Attachment C: Basement litholog
Page 57 and 58: 54 Well name TD (m) Probable Baseme
Page 69 and 70: 66 Attachment F - Recalculated cond
Page 71 and 72: Attachment H - Calculated heat gene
Page 73 and 74: Attachment J - Calculated heat gene
Page 75 and 76: 72 Dongara 12 3750 Gneiss N -29.238
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74 Murrumbah 1 3750 Gneiss N -29.15
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Well name Overall reliability (high
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Overall reliability (high, low, Hea
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Executive summary The Western Austr
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2 1.0 Introduction Thermal conducti
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4 2.0 Methodology Hot Dry Rocks Pty
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6 Gage Sandstone Quinn's Rock 1 776
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8 Sue Group: Ashbrook Sandstone Sue
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10 3. Thermal conductivity of rocks
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Table of Contents 1.0 HEAT FLOW MOD
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www.hotdryrocks.com 3
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