STANSBURY BASIN Links Tenements (PDF; contains a link to the DSD website for the latest information)
Report Correlation within early Palaeozoic basins of eastern South Australia (Jago et al., 2002; PDF)
Publications (website, DSD)
Summary Age Early–Middle Cambrian. Area in South Australia ~15 000 km2 (~5790 sq. miles). Depth to target zones 600–2500 m. Thickness Up to 1500 m. Hydrocarbon shows Trace gas on DST, trace oil reported in core. First commercial discovery None. Identified reserves Nil. Undiscovered resources (50% prob.) Not determined. Production Nil. Basin type Extensional; deformed by marginal collision. Depositional setting Marine shelf–ramp–basin. Reservoirs Dolomite, sandstone. Regional structure Anticlines on stable nucleus bordered by thrust-zones. Seals Redbeds, micritic limestone, evaporite. Source rocks Marine black shale. Depth to oil/gas window Not determined. Number of wells 6 petroleum, 5 stratigraphic, >20 deep mineral drillholes. Seismic line km 4753 2D offshore, 625 2D onshore.
Structural setting The prospective area of the Stansbury Basin lies mainly beneath Gulf St Vincent and southern Yorke Peninsula (Fig. 1). The sedimentary section crops out on northern Yorke Peninsula, Fleurieu Peninsula and the north coast of Kangaroo Island. To the east and south equivalent rocks are deformed, metamorphosed and intruded by granite.
In the western Stansbury Basin, Early Cambrian basal sand and marine shelf carbonate onlap the Gawler Craton and pass east into a ramp–basin setting which may have evolved into a foreland trough (Kanmantoo Trough). Structures beneath Gulf St Vincent are chiefly broad, low-amplitude anticlines. On Yorke Peninsula, where previous petroleum exploration was centred, drilling was mainly in complex fault-block mosaics associated with the Pine Point Fault Zone. This zone was tectonically active during the Early Cambrian resulting in ‘bald-heading’ of some structures, but the principal deformation (collision orogeny) took place in the Middle–Late Cambrian on the eastern and southern structural margins of the basin. The original
1 Stansbury Basin depositional area was much more extensive to the east and south, and is explored as a mineral province because of its high metamorphic grade and structural complexity.
Glacial erosion in the Late Carboniferous was followed by deposition of up to 2000 m of Permian (Troubridge Basin) and Tertiary sediments. A final compressional event in Tertiary to Recent time reactivated many Delamerian reverse faults along the platform margin.
Exploration history Dubious oil shows were reported by entrepreneurial drilling syndicates in the 1930s. Bona fide oil traces were reported from Minlaton 1 stratigraphic hole drilled in 1956–57, which confirmed an Early Cambrian section greater than 800 m thick (Fig. 2), but no samples remain for analysis.
In 1964 Beach Petroleum commenced a decade of systematic exploration with airborne magnetic and gravity surveys, seismic and drilling. Three deep exploration wells (Stansbury Town 1, Stansbury West 1, Edithburgh 1) were drilled and logged, with traces of gas accompanying highly saline water on drillstem test in Stansbury West 1. Seismic surveys of the day were of poor quality (474 km single-fold onshore; 925 km mostly single-fold offshore), with consequent uncertain siting of exploration wells on structural trends. Several stratigraphic wells were drilled by Beach, including Troubridge Island 1 on an offshore sandbank, which terminated in the Permian.
Mineral exploration on central and northern Yorke Peninsula in the 1970s and 1980s resulted in the acquisition of further gravity and magnetic data, and numerous wells were drilled (principally by Aquitaine and BHP) for base metals, uranium and dolomite. Apart from copper mined in Proterozoic rocks, no ore bodies have been discovered. In 1982–83, Pan Pacific Petroleum acquired 59 km of 24-fold Vibroseis and sampled drillcores for source rock analysis, demonstrating that available samples on Yorke Peninsula are mainly organically lean (TOC <0.5%) and gas prone.
A 1985 marine seismic survey in southern Gulf St Vincent (303 km, 60-fold) resulted in good structural definition of the Permian and Cambrian sections.
PEL 53 was granted in 1990 to Wagner and Brown (Aust.). Exploration included 1109 km of seismic acquisition (offshore), seismic reprocessing, tectonic studies and source rock geochemistry. PEL 59, adjacent, was also granted to Wagner and Brown in 1993, and 63 km of marine seismic were recorded (Fig. 1). Two wells (Enchilada 1, Frijole 1) were drilled to Cambrian targets in 1998, but without success. A cross-section through these wells is shown in Figure 3.
PEL 73 was granted to David Schuette in 2000. Gravestock 1 exploration well was drilled in February–March 2007 by Austin Exploration in PEL 73 in the Stansbury Basin, but was plugged and abandoned. The well was named to honour the late Dr David Gravestock — former Principal Petroleum Geologist for the South Australian Department of Mines and Energy. Dr Gravestock played a leading role in researching the state’s petroleum exploration potential, geology and Cambrian biostratigraphy over many years, until his untimely death in 1999.
Stratigraphy The Stansbury Basin succession on Yorke and Fleurieu Peninsulas forms two sequence sets (Є1, Є2), each of which can be separated into depositional sequences also recognised in the Arrowie Basin (Fig. 4). Correlation of the very thick (2500 m) section on the north coast of Kangaroo Island (not shown in Fig. 4) appears on present evidence to represent parts of sequences Є1.2–Є2.1 in separate thrust fault slivers.
Transgressive clastics of the basal Cambrian Uratanna sequence onlapped the Gawler Craton from the SE (Mt Terrible Formation), culminating in coarse-grained, late highstand deposits on Yorke Peninsula (Winulta
Petroleum and Geothermal in South Australia 2 Stansbury Basin
Formation). They were followed by shallow subtidal to supratidal, often dolomitised, oolite shoals, stromatolites and fenestral boundstones (most of Kulpara and Wangkonda formations). The upper lowstand wedge on Fleurieu Peninsula is characterised by shallow subtidal sandy dune ridges and bioturbated fine- grained interdune siliciclastics of the basal Sellick Hill Formation.
Transgression in sequence Є1.1 was characterised by shallow marine carbonates north of a hinge zone across central Yorke Peninsula. To the south and SE however, deeper water lime mud (lower Parara) and ribbon limestone (most of remaining Sellick Hill Formation) accumulated. Rapid marine regression led to subaerial exposure on northern Yorke Peninsula. Bioherms of the Fork Tree Limestone grew on the subtidal outer ramp during lowstand. With renewed transgression, mottled lime mud of the Parara and deep basinal shale (Heatherdale Shale) accumulated under fluctuating oxic–anoxic conditions. Episodes of volcanism are recorded by thin tuffs, one of which has yielded an age of 5264 Ma. On Yorke Peninsula, the Koolywurtie Member (upper Parara) is an archaeocyath–calcimicrobe reef complex which extended at least from Ardrossan to Edithburgh.
Tectonic activity (Kangarooian Movements) was accompanied by accumulation of alluvial and fan-delta conglomerates in the lowstand redbeds of Є2.1. Movement on the Pine Point Fault Zone, and southern extensions near Kangaroo Island, stripped portions of previously deposited carbonates (Kulpara, Parara, Koolywurtie) and locally exposed crystalline basement. These form the bulk of clasts in the Minlaton Formation on Yorke Peninsula and White Point Conglomerate on Kangaroo Island.
Differential uplift adjacent to the Gawler Craton was accompanied by foundering of the sea floor and initiation of the Kanmantoo Trough which arcs south and west from the Mt Lofty Ranges to Kangaroo Island. The Kangarooian Movements signify renewed rapid extension, creating space to accommodate great volumes of siliciclastics transported from a southern source. An alternative view suggests that Kanmantoo Trough sediments are older than depicted in Figure 4 and a younger foreland trough sequence accumulated rapidly as a result of convergence of the Delamerian Orogen. Carbonate and evaporite accumulated in the Minlaton Formation, and two major marine flooding events are represented on Yorke Peninsula by three third order sequences, namely Є2.2 (Ramsay Limestone – Corrodgery Formation), Є2.3 (Stansbury Limestone – Moonan Formation) and Є3.1 (uppermost Moonan and Coobowie Limestone). Sequences Є2.2 and Є2.3 are interpreted to correlate with the major basinal successions represented by the Talisker Calc-siltstone – Karinya Shale and Balquhidder Formation on Fleurieu Peninsula. Alternatively the Talisker, Karinya and Balquhidder could be older. The Coobowie Limestone is of Middle Cambrian age based on the first appearance of the trilobite Pagetia. Redbeds of the Yuruga Formation (Є3.2) are the youngest Cambrian strata preserved beneath the Permian unconformity on Yorke Peninsula (Fig. 4).
Permian sediments of the Troubridge Basin are estimated to be up to 600 m thick in glacially scoured valleys, several of which are preserved on Fleurieu Peninsula. Up to 2000 m of Permian sediments are interpreted from offshore seismic east of Backstairs Passage.
Tertiary sediments of the overlying St Vincent Basin accumulated in mildly compressional foreland troughs following the separation of Australia and Antarctica. Depositional patterns were strongly controlled by older structural trends. A maximum thickness of 600 m of Tertiary and Quaternary sediments has been recorded.
Source rocks Petroleum source potential in the Stansbury Basin is based on a very small data set of fewer than two dozen samples in available outcrops and drill cores.
Four formations — Ramsay Limestone, Parara Limestone (Yorke Peninsula), Heatherdale Shale (Fleurieu Peninsula) and Karinya Shale (Mt Lofty Ranges) — have been the focus of efforts to date. The limestones are lean but the Heatherdale Shale is a moderately rich source rock. Maturation level appears to be
Petroleum and Geothermal in South Australia 3 Stansbury Basin controlled by proximity to Proterozoic basement on Yorke Peninsula and to metamorphic rocks on Fleurieu Peninsula. Apatite fission track analysis indicates two thermal events; one resulting from the Delamerian Orogeny and the other dated ~100 Ma and possibly associated with Cretaceous rifting on the southern margin of Australia.
Two samples collected from the 540+ m thick Mt McDonnell Formation, while poor in organic content, nevertheless indicate a much lower level of maturity (VRcalc from methylphenanthrene index (MPI) equals 0.5–0.6%) consistent with the excellent preservation of fossils and organic material evident in thin sections. The Mt McDonnell Formation appears stratigraphically older than or is the same age as the Heatherdale Shale and was similarly deposited in a down ramp setting.
The Heatherdale and Karinya shales have the best source potential in the Stansbury Basin.
Reservoirs and seals Dolomitised limestone of the Kulpara Formation constitutes the principal reservoir and reaches 500 m in thickness. Core porosity ranges up to 13% and permeability reaches 340 mD. Brine recovered on test ranges from 13 000 to 157 000 ppm sodium chloride in Stansbury West 1, suggesting connate pore water and unbreached structures still exist.
Porosity is also indicated on wireline logs in the Koolywurtie reef complex which is up to 73 m thick (where not eroded by Minlaton Formation conglomerate), and may have originally extended from Ardrossan to Kangaroo Island, a distance of 100 km or more.
Potential sandstone reservoirs are arkosic with patchy carbonate cement, and porosity in outcrop is generally low. Their thickness (100 m, Winulta; ~350 m, Stokes Bay) justifies consideration as a secondary target, but their stratigraphic position below potential source rocks implies structuring may be necessary to elevate them to a level suitable to trap migrating hydrocarbons. Sands of the upper Moonan Formation (~40 m thick) occur near the Middle Cambrian and may develop as reservoirs at the Є2.3 sequence boundary.
The Kulpara Formation is sealed by thick micritic Parara Limestone. Regional seal was once provided by thick redbeds of the Yuruga Formation, but Permian glacial topography may have locally breached some traps. Notably, the oil shows in Minlaton 1 were in basal Permian strata.
Potential sandstone reservoirs on Fleurieu Peninsula (basal Sellick Hill Formation), Kangaroo Island (Stokes Bay Sandstone) and extensions beneath western Gulf St Vincent may pass eastward into impermeable shales which act as semi-regional seals.
Traps Structures with trap potential are fault-dependent and are mainly concentrated in the NNE striking Pine Point Fault Zone adjacent to the east coast of Yorke Peninsula. Simple domes may underlie northern Gulf St Vincent and the north Adelaide Plains near Dublin, and may be suitable for gas storage.
Undiscovered resources There is no estimate of undiscovered resources.
Current projects A review of Stansbury and Arrowie basins biostratigraphy was completed by Jago et al. (2002). Use this link to view the report.
Petroleum and Geothermal in South Australia 4 Stansbury Basin
Exploration access A number of National Parks and Wildlife reserves overlie the Stansbury Basin (fig. 1, Environment in the ‘Land access’ section of this USB; Fig. 1). However, exploration access is not restricted in the prospective areas.
Licence status Licence activity in the previous year is discussed in the ‘Exploration and development’ section of this USB, and Figure 5 shows the licence status at the time of publication. Use this link for further information on holders of petroleum tenements in South Australia.
Key references Alexander, E.M., Gravestock, D.I. and Weste, G., 1997. Sedimentology of the Stokes Bay Sandstone, Kangaroo Island. MESA Journal, 6:36-42.
Flöttmann, T., Haines, P.W., Cockshell, C.D. and Preiss, W.V., 1998. Reassessment of the seismic stratigraphy of the early Palaeozoic Stansbury Basin, Gulf St Vincent, South Australia. Australian Journal of Earth Sciences, 45:547-557.
Gravestock, D.I., Alexander, E., Demidenko, Yu.E., Esakova, N.V., Holmer, L.E., Jago, J.B., Tian-rui, Lin, Melnikova, L.M., Parkhaev, P.Yu., Rozanov, A.Yu., Ushatinskaya, G.T., Zang, W., Zhegallo, E.A. and Zhuravlev, A.Yu., 2001. The Cambrian biostratigraphy of the Stansbury Basin, South Australia. Russian Academy of Sciences Palaeontological Institute. Transactions, 282.
Haines, P.W. and Flöttmann, T., 1998. Delamerian Orogeny and potential foreland sedimentation: a review of age and stratigraphic constraints. Australian Journal of Earth Sciences, 45:559-570.
Jago, J.B. and Moore, P.S. (Eds), 1990. The evolution of a Late Precambrian – early Palaeozoic rift complex: the Adelaide Geosyncline. Geological Society of Australia. Special Publication, 16.
Jago, J.B., Sun, X. and Zang, W., 2002. Correlation within early Palaeozoic basins of eastern South Australia. South Australia. Department of Primary Industries and Resources. Report Book, 2002/33.
Sprigg, R.C., 1961. Oil and gas possibilities of the St Vincent Gulf graben. APEA Journal, 1:71-88.
Stuart, W.J. and von Sanden, A.T., 1972. Palaeozoic history of the St Vincent Gulf region, South Australia. APEA Journal, 12:9-16.
Teasdale, J., Pryer, L., Etheridge, M., Romine, K., Stuart-Smith, P., Cowan, J., Loutit, T., Vizy, J. and Henley, P., 2001. Western Stansbury Basin SEEBASE Project. SRK Consulting report, SRK Project Code: PI12. South Australia. Department of Primary Industries and Resources. Open file Envelope, 9889 (unpublished). Use this link to view or download the report.
Petroleum and Geothermal in South Australia 5 Stansbury Basin
FIGURES 1. Stansbury Basin, South Australia. Wells and seismic lines. (204456-096) 2. Schematic section through Cambrian strata in the western Stansbury Basin. (204456-097) 3. Cross-section through the Stansbury Basin, Investigator 1 to Myponga Beach (courtesy of Canyon (Australia)). (204456-098) 4. Geological summary of the Stansbury Basin. (204456-099) 5. Stansbury Basin, South Australia. Petroleum tenements. (204456-100)
Petroleum and Geothermal in South Australia 6 ÂÂ
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136°30'E 137°0'E 137°30'E 138°0'E 138°30'E 139°0'E 700000 800000 900000 6300000 :Saphira 1 ØElisa 1 6300000 Caroona Creek (CP) 33°30'S Clements Gap (CP) ÚAncalagon 1 Mokota (CP) 33°30'S Yeldulknie (CP) Middlecamp Hills (CP) Cleve " " Cowell Burra " Falkor 1 Red Banks (CP) Franklin Harbor (CP) Ú PL1
Clare ÚSmrgol 1 " Wallaroo " Lochiel Gorbash 1Spring Gully (CP) Kadina " : " Scatha 1
Bird Islands (CP) :
34°0'S Blyth 5 Bird Islands (CP) Gaurung: ª 1 Â Chloe 1 "Moonta 34°0'S
Clinton (CP)ª Raitaro 1
Ú Uwibami 1 Clinton 24C Ú Â ª Wakefield Olivia 1 ª ª" Spencer Gulf Port Clinton 1 ª :Tatsu 1 Balaklava 2 ª 5 ª4 Wills Creek (CP) ÚRinjin ª1
6200000 Ka Riu 1 6200000
Maitland Showground 1Maitland : Kapunda "ª Dublin 1 " ª  Maitland Oil Bore ª ªª2ª 3 Joshua 1 Brookfield (CP) Ardrossan 1 Barabbaª 1 Goose Island (CP) ª Kiyo: 17 6 ª ª Nuriootpa
34°30'S " Penrice Hallions Bore 1 " ª 3 PL1 2: Light 1ªª2 ª ª 34°30'S Anna 1 1A Tiamat 1:Emerley 1 Gawler ª ªªBlack Point 1 " Port Julia ª1A Port Gawlerª 32 PL6 Swan Reach (CP) Sir Joseph Banks Group (CP) Curramulka 2 ªªª Kaiserstuhl (CP) ª Port Gawler (CP) ª ªLegoeª 1 : Elizabeth 2 Virginia 1A " Minlatonª ª Bryaugh 1 "ª Ramsayª (CP)ª Minlaton 1 Torrens Island (CP) Mount Pleasant ª ª 2 " ª Torrens Island (CP) Minlaton South Bore 1 Cromer (CP) Minlacowieª (CP)ªStansbury Town 1 ªGrange 1 Stansburyª West 1 ADELAIDE Mannum ªPeninsula Oil 1 " " Carribie (CP) Charleston (CP) 35°0'S Yorketown " Kenneth Stirling (CP) Ettrick (CP) Gambier Islands (CP) Gravestock 1 Edithburgh 35°0'S ª " Gulf of St Vincent Mark Oliphant (CP) ªEdithburgh 1 Troubridge Island 1 Warrenben (CP) ª Scott Creek (CP) Murray Bridge Long Island (RP) Troubridge Island (CP) " Point Davenport (CP) ªFrijole 1 Onkaparinga River (NP) Innes (NP) Moana Sands (CP) Monarto (CP) ª 6100000 6100000 Strathalbyn Kyeema (CP) " ªEnchilada 1 Ferries - McDonald (CP) Aldinga Scrub (CP) PL13 Cox Scrub (CP) Althorpe Islands (CP) Poonthie Ruwi - Riverdale (CP) Yulte (CP) Milang Tolderol (GR) Scott (CP) " Myponga (CP) Donna 1 35°30'S Currency Creek (GR) ª Investigator 1 2 ª " ª Granite Island (RP) 35°30'S Beatrice Islet (CP) Eric Bonython (CP) Mud Islands (GR) Lathami (CP) " Newland Head (CP) Salt Lagoon Islands (CP) Western River (CP) Kingscote Deep Creek (CP) Cape Torrens (CP)Western River (WA) Baudin" (CP) Meningie Nepean Bay (CP) ªAmerican Beach Oil 1 " Parndana (CP) Beyeria (CP) Lashmar (CP) Ravine des Casoars (WA) Seddon (CP) Pelican Lagoon (CP)Dudley (CP) The Pages (CP) Lesueur (CP) Mount Taylor (CP) Cape Gantheaume (CP) Seal Bay (CP) Flinders Chase (NP)Kelly Hill (CP) 36°0'S Cape Gantheaume (WA) Cape Bouguer (WA)Vivonne Bay (CP) Coorong (NP)
36°0'S
6000000 6000000 ª ªª
700000 800000 900000 136°30'E 137°0'E 137°30'E 138°0'E 138°30'E 139°0'E 139°30'E SOUTH AUSTRALIA ª : Ø ADELAIDE Ú " Stansbury Basin South Australia WELLS and SEISMIC LINES Figure 1 DSD 204548-096 Stansbury Town 1 Edithburgh 1
surface Stansbury West 1 n io s ro e s u Minlaton 2 Minlaton 1 ro e YURUGA FORMATION if n o b COOBOWIE ar MINLATON -C LIMESTONE Datum: o Koolywurtie erm base Ramsay Limestone P CORRODGERY – MOONAN FORMATIONS PARARA RAMSAY LIMESTONE KULPARA Koolywurtie MINLATON FORMATION Koolywurtie Member Mbr WINULTA Koolywurtie Member KULPARA FM WINULTA FM PARARA LIMESTONE
KULPARA FORMATION YORKE PENINSULA Minlaton 2 WINULTA FORMA TION Minlaton 1 VINCENT 500 Stansbury Stansbury West 1 Town 1
ST Line of section
METRES Edithburgh 1 0
204548-097 GULF Figure 2 Schematic section through Cambrian strata in the western Stansbury Basin 204548-098 Figure 3 Cross-section through the Stansbury Basin, Investigator 1 to Myponga Beach (courtesy of Canyon (Australia)). ROCK UNIT AND LITHOLOGY DEPOSITIONAL ENVIRONMENT COMMENTS AGE YORKE PENINSULA SEQUENCE FLEURIEU PENINSULA YORKE PENINSULA FLEURIEU PENINSULA (Yorke Peninsula Only) STRATIGRAPHY AUSTRALIA PLAINS PETREL COVE YURUGA Lowstand YURUGA: intertidal sand flat to KANMANTOO GROUP: YORKE PENINSULA: Yuruga is BALQUHIDDER 550m tract subaerial fan. represents 2 super-sequences regional seal to potential source (271.57m) C3.2 TUNKALILLA COOBOWIE C3 SB1 (sequence sets). Rocks regionally and reservoir rocks of Ramsay- MIDDLE 30m (12.57m)
CAMBRIAN
C3.1 RAMSAY-COOBOWIE: metamorphosed, tectonically Coobowie carbonate-clastic 70m SB1 TAPANAPPA MOONAN transgressive-regressive shallow thickened and intruded by granite. 20m Transgressive FORMATION package. 77m tract marine limestone alternating with STANSBURY(60m) C2.3 sandstone and shale. Max. Talisker passes north into Karinya CORRODGERY TALISKER Shale with good to excellent source 78m (76m) transgression marked by upper Transgressive CALCSILTSTONE potential. RAMSAY 120m Ramsay and Moonan. C2 tract LST (62m) BACKSTAIRS C2.2 PASSAGE FM Alternative correlation places SB1 Kanmantoo Gp below Minlaton Fm
MINLATON GROUP KANMANTOO FM CARRICKALINGA MINLATON: red-beds and fan CARRICKALINGA HEAD: Seal potential for underlying vv HEAD delta conglomerate at lowstand. lowstand submarine fan complex. reservoirs.
120m C2.1 Lowstand tract FORMATION (50m) SB1 Lagoon-evaporitic carbonates. KANGAROOIAN MOVEMENTS KOOLYWURTIE: archaeocyath - HEATHERDALE SHALE: VOLCANISM TRURO v v Highstand calcimicrobe reef complex. deepwater shale in south, shoaling Pronounced syndepositional uplift 76m VOLCS tract v Shoaling up. Capped by peri- or sanding northwards. Volcanics, and erosion. emergent cyanobacterial mats. tuff in northeast basin (Truro Complex fault traps. HEATHER- v v Volcanics). vv DALE KOOLYWURTIE SHALE v Deepest water represents base of MBR C1.3 PARARA: poor to fair source v v ramp to basin setting. 300 m v PARARA: transgressive marine potential in Parara Limestone, v argillaceous, nodular limestone. but overmature for liquids PARARA v v v Oscillating aerobic-anaerobic generation where sampled. Transgressive LIMESTONE conditions below sediment water Unit extends east beneath tract v v interface. Condensed section on ? ? ? Gulf St Vincent and passes laterally northern Yorke Peninsula marked into Heatherdale Shale. by phosphate coatings. HEATHERDALE: fair to excellent source potential but overmature EARLY CAMBRIAN >270 m where sampled. Laminated micro-stromatolites record FORK TREE: outer ramp bioherm C1.2 FORK TREE drowning at base of sequence C1.2 LIMESTONE v v v complexes, possibble grain flows. C1 TRURO v Lowstand 300 m v v Moderately deep water lowstand 300m SELLICK HILL (200m) tract deposits. SB1 FORMATION 240 m Highstand tract KULPARA: Peritidal oolitic and SELLICK HILL: subtidal sand KULPARA: proven dolomite shoals deepening up to carbonate reservoirs which extend beneath Transgressive stromatolitic succession. High WANGKONDA tract energy grainstones, frequently ramp. Slumps, storm breccias, Gulf St Vincent. Heavily gas cut FORMATION dolomitised. Part of broad isolated bioherms. Ramp on salt water produced on test. 110 m carbonate shelf which extended seaward margin. Intercrystalline, moldic and vuggy KULPARA C1.1 east from Gawler Craton beneath porosity. FORMATION Gulf St Vincent. Anticlinal traps. Lowstand tract CONTACTS WANGKONDA: carb.-dominated MT tidal flat complex. Ooid and 500m TERRIBLE fenestral limestones. Continuous (230m) SB1 FM with shelf on Yorke Peninsula. WINULTA 100m 110 m FORMATION (70m) Transgressive TECTONIC tract WINULTA + MT TERRIBLE: ?Fluvial (on Gawler Craton) to subtidal sheet Extensive sheet sands. Potential sandstones and siltstones. Latter more frequent in deeper part of shelf reservoirs rely on structurally SB1 on Fleurieu Peninsula. favourable location. URATANNA SEQUENCE XTALL- ADELAIDEAN ADELAIDEAN P INE SEDIMENTS BASEMENT 204548-099 Maximum Thickness 450m Figure 4 Geological summary of the Stansbury Basin. Average Thickness (55m) 136°30'E 137°0'E 137°30'E 138°0'E 138°30'E 139°0'E 700000 PEL 126 800000 900000 6300000 6300000 Caroona Creek (CP)
33°30'S Munyaroo (CP) The Plug Range (CP) Caroona Creek (CP) PEL 126 Clements Gap (CP) PEL 606
Mokota (CP) 33°30'S Yeldulknie (CP) Middlecamp Hills (CP) Cleve " PL1 " Cowell Burra " Red Banks (CP) Franklin Harbor (CP)
573 Clare " Wallaroo " Lochiel Spring Gully (CP) Kadina " Hopkins Creek (CP) " Bird Islands (CP) 34°0'S Bird Islands (CP)Moonta " PEL 120 34°0'S "
Clinton (CP) Spencer Gulf "Wakefield 266 PEL 606 Wills Creek (CP) 6200000 Maitland Kapunda 6200000 " " 574 Brookfield (CP)
Goose Island (CP) PEL 174 Nuriootpa
34°30'S " Penrice " PL1 34°30'S 266 Gawler " 266 Swan Reach (CP) Sir Joseph Banks Group (CP) Kaiserstuhl (CP) PL6 Franklin Harbor (CP) Port Gawler (CP) Elizabeth Minlaton 266 " " Ramsay (CP) Torrens Island (CP) Mount Pleasant " Torrens Island (CP) Cromer (CP) Leven Beach (CP) Minlacowie (CP) ADELAIDE Mannum " " Carribie (CP) Charleston (CP) 35°0'S Yorketown " Kenneth Stirling (CP) Ettrick (CP) Gambier Islands (CP) Edithburgh 35°0'S " Gulf of St Vincent Mark Oliphant (CP) Warrenben (CP) Scott Creek (CP) Murray Bridge Long Island (RP) Troubridge Island (CP) " Point Davenport (CP) Onkaparinga River (NP) Innes (NP) Moana Sands (CP) Monarto (CP) 6100000 6100000 Strathalbyn Kyeema (CP) " Ferries - McDonald (CP) PL13 Aldinga Scrub (CP) " Cox Scrub (CP) Althorpe Islands (CP) Poonthie Ruwi - Riverdale (CP) Yulte (CP) Milang Tolderol (GR) Scott (CP) " Myponga (CP) 35°30'S Currency Creek (GR) " Granite Island (RP) 35°30'S Beatrice Islet (CP) Eric Bonython (CP) Mud Islands (GR) Lathami (CP) " Newland Head (CP) Salt Lagoon Islands (CP) Western River (CP) Kingscote Deep Creek (CP) Cape Torrens (CP)Western River (WA) Baudin" (CP) Meningie Nepean Bay (CP) " Parndana (CP) Lashmar (CP) Ravine des Casoars (WA) Beyeria (CP) Seddon (CP) Pelican Lagoon (CP)Dudley (CP) The Pages (CP) Lesueur (CP) Mount Taylor (CP) Cape Gantheaume (CP) Seal Bay (CP) Flinders Chase (NP)Kelly Hill (CP) 36°0'S Cape Gantheaume (WA) Cape Bouguer (WA)Vivonne Bay (CP) Coorong (NP)
36°0'S 6000000 6000000
700000 800000 900000 136°30'E 137°0'E 137°30'E 138°0'E 138°30'E 139°0'E 139°30'E SOUTH AUSTRALIA 0 25 50 km Petroleum tenements Pipeline licence (PL) MGA Zone 53 Petroleum exploration Gas pipeline licence application (PELA) Petroleum exploration licence (PEL) Parks with petroleum exploration access ADELAIDE " Geothermal tenements Parks with no petroleum Stansbury Basin Geothermal exploration exploration access South Australia licence application (GELA) Geothermal exploration PETROLEUM and licence (GEL) GEOTHERMAL ENERGY ACT TENEMENTS Figure 5 DSD 204548-100