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

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21 Table 4.2 Summary of rock thermal conductivity values by formation for the northern Perth Basin, as used for 1D heat flow modelling in this report. “Average error” is one standard deviation uncertainty. Northern Perth Basin Formation Conductivity W/mK Harmonic mean Average Error Alluvium/Tertiary sediments 1.42 0.14 Coolyena Group 1.13 0.08 Parmelia Group 2.58 0.33 Yarragadee Formation 3.54 0.30 Cadda Formation 4.14 0.52 Cattamarra Coal Measures 3.73 0.20 Eneabba Formation 2.62 0.44 Lesueur Sandstone 3.56 0.23 Woodada Formation 2.79 0.12 Kockatea Shale 2.09 0.06 Dongara/Wagina Sandstone 2.92 0.56 Beekeeper Formation 2.25 0.21 Carynginia Formation 1.77 0.36 Irwin River Coal Measures 3.02 0.50 High Cliff Sandstone 4.40 0.20 Holmwood Shale 1.45 0.15 Nangetty Formation 2.75 0.42 Wicherina Beds 2.75 0.42 Basement 3.20 0.40 4.6. Estimating lithologies at depth 1D heat flow models for temperature prediction at depth require detailed lithological data and the associated rock thermal conductivities of those lithologies. HDRPL utilised the DoIR formation top database, with KB datum, to constrain likely lithologies within the upper portion of the heat flow models. Other available data were used to estimate deeper lithologies. In estimating the thickness of non-intersected units for each well, HDRPL utilised existing deep wells in the southern and northern basin (separated arbitrarily by latitude 30°00’S) to ascribe formation thickness as a ratio of entire stratigraphic www.hotdryrocks.com
22 column. OZ SEEBASE depth-to-basement estimates for all wells (Attachment C) were used to constrain the overall thickness of the sedimentary section, to which the unit-specific ratios were applied. This methodology assumes that all units will be found laterally across the basin in a relatively constant ratio. Whilst simplistic, this methodology provides one of the few mechanisms to estimate the likely thickness of deep units for which there is a paucity t al. 1995 11 of data. Thickness estimates were, however, crosschecked and manually adjusted well-by-well using the published compilations of seismic depth maps for key horizons (Crostella, 1995 ). 10 ; Mory and Iasky, 1996 3 ) and gravity data (Le Blanc e In most cases the ratio thickness of units agreed well with seismic isopach maps, at least to the base Jurassic. This is to be expected owing to the post-rift thermal subsidence phase that controlled the deposition of the Jurassic to Cretaceous succession. The Cattamarra Coal Measures were much thicker than originally suggested in the test well (Cattaby-1) and this is apparent in the isopach maps. Unit thickness within the 1D heat flow models was therefore changed on a well-by-well basis to be consistent with seismic isopach maps. Seismic line A89-708 transects (E-W) the northern part of the central Perth Basin and demonstrates the general geometry of the basin (Figure 4.1). The basin succession thickens dramatically in the hanging wall of the Urella and Darling Faults; so much so that basement cannot be resolved. The deepest horizons probably belong the neartop Triassic or the Cattamarra Coal Measures (>3 sec TWT). The Jurassic- Cretaceous succession shows little growth into the major controlling faults, suggesting uniform post-rift subsidence deposition. Other regional lines show syndepositional growth of the Permian-Triassic succession into the Urella and Darling Faults (Mory and Iasky, 1996 3 ). Estimating the thickness of the deepest Permian units (eg. Nangetty Formation) was, therefore, difficult. The formation is thought to thin to the west and south over the Allanooka High towards the Dongara Terrace and Greenough Shelf (Mory and Iasky, 10 Crostella, A., 1995, An evaluation of the hydrocarbon potential of the onshore northern Perth Basin:Western Australia Geological Survey, Report 43, 67p 11 Le Blanc Smith, G., And Mory, A. J., 1995, Geology and Permian coal resources of the Irwin Terrace, Western Australia: Western Australia Geological Survey, Report 44, 60p 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: 20 Table 4.1 Summary of rock therma
Page 27 and 28: 24 4.7. Estimating basement heat ge
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
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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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Geothermal Energy Potential in Selected Areas of Western Australia ...

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