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Eastern Officer Basin: Structural Framework from Geophysical Data

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Eastern Officer Basin: Structural Framework from Geophysical Data EASTERN OFFICER BASIN: STRUCTURAL FRAMEWORK FROM GEOPHYSICAL DATA GEOINTERP CONFIDENTIAL REPORT 2003/2 For OIL & GAS DIVISION DEPARTMENT OF PRIMARY INDUSTRIES SA Grenfell St, Adelaide L R RANKIN Consulting Geologist PO Box 195, Aldgate, SA 5154, Australia RANKIN CONSULTANCY PL ABN 26079486025 Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA This report and accompanying maps have been compiled by The Consultant from data supplied by The Department of Primary Industries South Australia (PIRSA). Whilst every effort has been made to carry out the work as diligently as possible, The Consultant accepts no responsibility for technical or business decisions arising from this report and the accompanying maps. Leigh R Rankin Director, Rankin Consultancy PL June 2003 RANKIN CONSULTANCY PL i Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA Table of Contents Table of Contents ............................................................................................. ii 1. EXECUTIVE SUMMARY................................................................................ 6 2.1. Preamble................................................................................................................. 9 2.2. Aims & Strategy..................................................................................................... 9 3. DATA & INTERPRETATION METHODOLOGY .......................................... 14 3.1. Geophysical and Geological Data...................................................................... 14 3.2. Geological interpretation methodology............................................................. 17 3.3. Glossary of terms for magnetic data ................................................................. 21 4. RESULTS OF INTERPRETATION .............................................................. 23 4.1. Structural Framework.......................................................................................... 23 4.1.1. Basement.......................................................................................................... 23 4.1.1.1. Western Gawler Craton ................................................................................... 25 4.1.1.2. Ammaroodinna & Yoolperlunna Inliers ............................................................ 26 4.1.1.2. Coompana Block ............................................................................................. 32 4.1.1.3. Musgrave Block ............................................................................................... 32 4.1.1.4. Concealed Basement ...................................................................................... 36 4.1.2. Officer Basin ..................................................................................................... 42 4.1.2.1. Sector 1 (SW region – Murnaroo Platform A & Watson Ridge) ....................... 42 4.1.2.2. Sector 2 (Tallaringa Trough, eastern region)................................................... 43 4.1.2.3. Sector 3 (Nawa Ridge) .................................................................................... 50 4.1.2.4. Sector 4 (Birksgate & Munyarai Subbasins) .................................................... 52 4.1.2.5. Sector 5 - NE transpressive Domain .............................................................. 56 RANKIN CONSULTANCY PL ii Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA 4.1.2.6. Sector 6 - Bitchera Ridge – Boorthanna Trough.............................................. 59 4.2.1.7. Salt structures.................................................................................................. 59 4.2. Tectonic Development ........................................................................................ 61 4.2.1. Pre – Officer Basin............................................................................................ 61 4.2.2. Officer Basin – Neoproterozoic ....................................................................... 62 4.3. Depth to Basement.............................................................................................. 68 5. EXPLORATION TARGETing ...................................................................... 83 5.1. Officer Basin – Hydrocarbons............................................................................ 83 5.2. Basement – Mineral Targets............................................................................... 86 6. SUMMARY & RECOMMENDATIONS......................................................... 87 REFERENCES................................................................................................. 89 FIGURES Figure 1. Outline of Officer Basin (green line) and adjacent regions of continental Australia (adapted from Gravestock, 1997). Figure 2. Summary of current stratigraphic nomenclature for the eastern Officer Basin. Figure 3. Summary of Archaean to earliest Neoproterozoic tectonic events – basement to Officer Basin. Figure 4. Schematic diagram of induced dipolar magnetic profile for a magnetic body at moderate magnetic latitude. Figure 5. Location of Middle Palaeozoic to Cainozoic basins of South Australia (from Drexel et al, 1993). Figure 6. RTP-1VD magnetic image of Officer Basin and surrounding basement domains. Figure 7. RTP-1VD image of Officer Basin and surrounding basement, highlighting dextral wrench basin along Coorabie Shear Zone. Figure 8. TMI image of SA (from Geoscience Australia). Figure 9. RTP – 1st VD magnetic image highlighting mafic dykes of the Gairdner Dyke Swarm. RANKIN CONSULTANCY PL iii Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA Figure 10. Total magnetic intensity image of Australia (after Geoscience Australia); Coompana-Isa Shear Zone highlighted. Figure 11. RTP – 1DV magnetic image, highlighting negatively magnetic mafic intrusives of the Coompana Suite emplaced within the Coompana Block, Munyarai Subdomain and Gawler Craton. Figure 12. Bouger gravity image (colour) superposed on RTP-1VD magnetic image. Significant NNW trending structures along the northern margin of the Officer Basin are evident in the Bouger gravity data (black dashed lines). Figure 13. Simplified tectonic sketch of the Musgrave Block (after Rankin & Newton, 2002). Figure 14. RTP-1VD magnetic image; basement subdomains highlighted. Figure 15. General trend of Nurrai Ridge superimposed on Bouger gravity image (colour). Figure 16. RTP-1VD magnetic image – SE Officer Basin, highlighting interpreted intrabasement magnetic sources. Figure 17a. RTP-1VD image – Officer Basin; note high-frequency detail in magnetic data for shallow sectors of basin, particularly in the Ammaroodinna / Middle Bore Ridges & Tallaringa Trough areas. Figure 17 b. Officer Basin structural framework superimposed on RTP-1VD image. Figure 17c. Approximate location and boundaries of the tectonic sectors for the eastern Officer Basin. Figure 18. RTP-1st VD magnetic image of Tallaringa Trough area. Figure 19. Structural framework of Officer Basin superimposed on RTP-1VD magnetic image. Tallaringa Trough bounded by a) Karari FZ to SE, and b) complex NE- trending fault zone to NW (part of Nawa Ridge complex). Figure 20. Structural framework of Officer Basin. Red lines outline trend of regional structures evident in Bouger gravity data. Figure 21. Officer Basin structural framework highlighting location of Nawa Ridge and Birksgate – Coober Pedy Corridor. Figure 22. Outline of Sector 4 of northern Officer Basin (superimposed on RTP-1VD image). Figure 23. Outline of Sector 4 of northern Officer Basin (superimposed on colour Bouger gravity image). Figure 24. Structural framework of NE transpressive zone (Sector 5). Figure 25. Structural framework of Ammaroodinna Ridge – Middle Bore Ridge area (detail from Map 3). Figure 26. Officer Basin – Sector 6. RANKIN CONSULTANCY PL iv Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA Figure 27. Summary cartoons of Neoproterozoic – Devonian tectonic development, eastern Officer Basin. Figure 28. SEEBASE model of depth to basement – eastern Officer Basin (from Teasdale et al, 2001). Figure 29. Depth to magnetic basement and Eluder 2-D modelling (Calandro & Read, in press). Figure 30. Location of modelled profile lines for SEEBASE depth to basement model (after Teasdale et al, 2001). Lines superimposed on TMI magnetic image. Figure 31. Location of seismic lines – eastern Officer Basin. Figure 32. Seismic profile 93 – AGS03. Figure 33. Seismic profile 93 – AGS-04. Figure 34. Seismic profile 93 - AGS05. Figure 35. Seismic profile 93 – AGS06 Figure 36. Seismic profile 86)F-01. Figure 37. Location of magnetic profile lines E-W 1-6 and N-S 1 & 2. Figure 38. Location of magnetic profile line N-S 3 (Ammaroodinna Ridge area). Figure 39. Structural framework of eastern Officer Basin. Several zones of intersecting regional NW & NE structures have been highlighted as potential loci for structural trap development (including salt tectonic structures). TABLES 1. Datasets used …………………………………………………………………………….16 APPENDICES 1. Geophysical images…………………………………………………………………….91 2. Selected magnetic profiles……………………………………………………………..99 MAPS 1. Observation layer from magnetic data. Compiled at 1:500 000 scale. 2. Structural framework (crystalline basement). Compiled at 1:500 000 scale. 3. Structural framework (Officer Basin). Compiled at 1:500 000 scale. RANKIN CONSULTANCY PL v Geointerp 2003/1:- Structural Framework - Eastern Officer Basin PIRSA 1. EXECUTIVE SUMMARY A structural geological framework
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