Release Areas NT14-1, NT14-2 and NT14-3, northern Bonaparte Basin, Northern Territory

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OFFSHORE PETROLEUM EXPLORATION ACREAGE RELEASE AUSTRALIA 2014 Release Areas 14-1, 14-2 and 14-3, northern Bonaparte Basin, Northern Territory Highlights Areas 14-1 to 3 Bonaparte Basin Work program

1 OFFSHORE PETROLEUM EXPLORATION ACREAGE RELEASE AUSTRALIA 2014 Release Areas 14-1, 14-2 and 14-3, northern Bonaparte Basin, Northern Territory Highlights Areas 14-1 to 3 Bonaparte Basin Work program bids close 2 October 2014 WESTERN AUSTRALIA NORTHERN TERRITORY SOUTH AUSTRALIA QUEENSLAND NEW SOUTH WALES Adjacent to Barossa, Caldita, Greater Sunrise, Evans Shoal and Evans Shoal South gas accumulations Shallow to deep water depths, m Plays include faulted anticlines, horst structures, drape and unconformity traps Multiple potential oil- and gas-prone source rocks within the region VICTORIA Special Notices apply, refer to Guidance Notes TASMANIA Figure 1 Location of the 2014 Release Areas in the northern Bonaparte Basin Release Areas 14-1, 14-2 and 14-3 are located in the Calder Graben, Troubadour Terrace and Sahul Platform regions of the northern Bonaparte Basin respectively. Recent drilling in the area includes Blackwood 2 (2013), Evans Shoal North 1 (2013) and Heron South 1 (2012). The three Release Areas lie approximately 350 km offshore from Darwin. The Sahul Platform is an area of relatively shallow basement with an overlying Permo Triassic succession that was uplifted during Jurassic extension of the adjacent Malita and Calder graben. The southern boundary of the Sahul Platform is marked by northeast-striking Mesozoic normal faults showing displacement down into the Malita and Calder graben, creating a series of prominent blocks and terraces. The Malita Graben and Calder Graben form a major northeast-trending rift system that lies between the Petrel Sub-basin and the Sahul Platform. The Jurassic Plover is the primary source and reservoir for the Sahul Platform, Troubadour Terrace, Malita Graben and Calder Graben gas accumulations. Gas shows have also been found in fractured carbonates of the Lower Cretaceous Darwin. Condensate sourced from the Cretaceous Echuca Shoals (e.g. Blackwood 1ST1) indicates there could also be an under-explored liquid play in the region. AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 1 DISCLAIMER: This document has been developed as a guide only. Explorers should not rely solely on this information when making commercial decisions. Image courtesy of BHP Billiton Petroleum Pty Ltd.

2 Abadi Sunrise Figure 5 INDONESIA AUSTRALIA Tyche Troubadour Terrace Figure 6 Troubadour 10 Sahul Platform Chuditch 1 JPDA * 14-3 Blackwood 1 ST1 " * Heron 2 Wonarah 1 +* " 13-1 Evans Shoal Heron 1 Barossa Caldita Evans Shoal South Malita Graben + BONAPARTE BASIN Calder Graben Figure 4 MONEY SHOAL BASIN Darwin Shelf Petrel Sub-basin Bayu/Undan to Darwin pipeline Basin outline Sub-basin outline Major fault Minor fault 0 75 km Well symbol information is sourced either from "open file" data from titleholders where this is publicly available as at 1 November 2013 or from other public sources. Pipelines and field outlines are provided by Encom GPinfo, a Pitney Bowes Software (PBS) Pty Ltd product. Whilst all care is taken in the compilation of the field outlines by PBS, no warranty is provided re the accuracy or completeness of the information, and it is the responsibility of the Customer to ensure, by independent means, that those parts of the information used by it are correct before any reliance is placed on them Offshore Petroleum Acreage Release Area (work program bidding) 2013 Offshore Petroleum Acreage Release Area Gas field Gas pipeline Seismic section figure location Scheduled area boundary (OPGGSA 2006) * + " WA SA Petroleum exploration well - Unclassified TAS Petroleum exploration well - Gas discovery Petroleum exploration well - Gas show Petroleum exploration well - Dry hole QLD NSW VIC Figure 2 Structural elements of the northern Bonaparte Basin (after Colwell and Kennard, 1996) showing petroleum fields and discoveries, the location of regional seismic lines and the 2014 Release Areas AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 2

3 Age (Ma) Period Epoch Stage Quaternary Holocene Pleistocene Pliocene Tarantian Ionian Calabrian Gelasian Piacenzian Zanclean Messinian Seismic horizons (AGSO, 2001) lmio Basin Troubadour Terrace/ phases Hydrocarbon shows Hydrocarbon shows Sahul Platform Barracouta Shoal Calder and Malita Graben Barracouta Shoal Neogene Paleogene Miocene Oligocene Eocene Paleocene Tortonian Serravallian Langhian Burdigalian Aquitanian Chattian Rupelian Priabonian Bartonian Lutetian Ypresian Thanetian Selandian Danian bmio molig beoc bter Oliver Cartier Prion Hibernia Grebe Sandstone Member (Hibernia ) Johnson Woodbine Group Oliver Oliver Sandstone Member (Oliver ) Undifferentiated Prion/ Hibernia s Grebe Sandstone Member (Hibernia ) Johnson Woodbine Group 70 Maastrichtian Puffin Puffin 80 Campanian Permian Triassic Jurassic Cretaceous Late Early Late Middle Early Late Middle Early Lopingian Guadalupian Cisuralian Santonian Coniacian Turonian Cenomanian Albian Aptian Barremian Hauterivian Valanginian Berriasian Tithonian Kimmeridgian Oxfordian Callovian Bathonian Bajocian Aalenian Toarcian Pliensbachian Sinemurian Hettangian Rhaetian Norian Carnian Ladinian Anisian Olenekian Induan Changhsingian Wuchiapingian Capitanian Wordian Roadian Kungurian tur apt val bcre call bjtt mtri tper Inversion Sag dominated Sag dominated (Fitzroy movement) Bard 1 Blackwood 1 ST1 Kelp 1 Mandar 1 Troubadour 1 Basilisk 1A, Naga 1, Wallaroo 1 Blackwood 1 ST1 Chuditch 1 Loxton Shoals 1 Sunrise 1 Sunrise 2 Sunset 1 Sunset West 1 Kelp Deep 1 Kelp Deep 1 Wangarlu Darwin Echuca Shoals Upper Frigate Shale Lower Frigate Shale Elang Plover Nome Challis Pollard Osprey Fishburn Ascalon Mairmull Penguin Tern Dombey Cape Hay Pearce Mt Goodwin Subgroup Hyland Bay Subgroup Bathurst Island Group Flamingo Group Troughton Group Sahul Group Kinmore Group Heron 1 Heron 1, Heron 2, Lynedoch 1A ST1 Heron 1 Beluga 1, Jacaranda 1, Heron South 1 Evans Shoal South 1, Lynedoch 1A ST1 Caldita 1, Heron 2 Beluga 1, Evans Shoal South 1, Heron 1, Jacaranda 1 Barossa ST1, Caldita 1 Evans Shoal 1, Heron South 1 Beluga 1, Lynedoch 2 Barossa 1 ST1 Evans Shoal 1 Evans Shoal 2 Evans Shoal North 1 Heron 2 Heron South 1 Wangarlu Darwin Echuca Shoals Upper Frigate Shale Lower Frigate Shale Elang Plover Malita Cape Londonderry Lower Cape Londonderry (Osprey Equivalent) Fishburn Ascalon Mairmull Penguin Tern Dombey Cape Hay Pearce Torrens Fossil Head Mt Goodwin Subgroup Hyland Bay Subgroup Bathurst Island Group Flamingo Group Troughton Group Kinmore Group Figure 3 Stratigraphy and hydrocarbon discoveries of the northern Bonaparte Basin based on the Bonaparte Basin Biozonation and Stratigraphy Chart 34 (Kelman et al., 2014). Geologic Time Scale after Gradstein et al (2012). Regional seismic horizons after AGSO (2001) AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 3

4 0 NW Troubadour Terrace 14-2 Barossa 1 ST1 Lynedoch 1A 14-1 Calder Graben MONEY SHOAL BASIN SE Late Miocene 2 Turonian Aptian Mid Oligocene Base Eocene Valanginian Near Top Permian Base Tertiary Cenomanian - Albian Two-way time (s) 4 Middle Triassic Near Top Permian Callovian Base Jurassic Basement Late Carboniferous Top Carboniferous Line n118/ km Figure 4 Seismic line 118/09 across the Troubadour Terrace and Calder Graben. Interpretation after AGSO (2001). Location of seismic line is shown on Figure 2. Regional seismic horizons are shown in Figure 3 AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 4

5 14-3 Sahul Platform Troubadour Terrace Malita Graben Darwin Shelf 0 NW Late Miocene Mid Oligocene Base Eocene Base Tertiary Blackwood 1 ST1 Wonarah 1 Heron 2 Heron 1 SE 2 Turonian Valanginian Aptian Near Top Permian Two-way time (s) 4 6 Middle Triassic Callovian Base Jurassic Near Top Permian Late Carboniferous Basement 8 10 Line n116/ km Figure 5 Seismic line 116/13 across the Sahul Platform, Troubadour Terrace and Malita Graben. Interpretation after AGSO (2001). Location of seismic line is shown on Figure 2. Regional seismic horizons are shown in Figure 3 AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 5

6 Troubadour Terrace Calder Graben MONEY SHOAL BASIN NW SE Late Miocene Mid Oligocene Base Tertiary Base Eocene 2 Valanginian Turonian Aptian Near Top Permian Callovian ssic Base Jura rous e if arbon Top C 4 Two-way time (s) Nea r To pp erm ian oniferous Late Carb ent Basem Line n118/11 Figure km Seismic line 118/11 across the Calder Graben. Interpretation after AGSO (2001). Location of seismic line is shown on Figure 2. Regional seismic horizons are shown in Figure 3 AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 6

7 Abadi Sunrise INDONESIA AUSTRALIA Troubadour 10 Sahul Platform 14-3 Troubadour Terrace Evans Shoal Barossa Caldita Evans Shoal South Calder Graben 11 JPDA Malita Graben BONAPARTE BASIN Darwin Shelf MONEY SHOAL BASIN 13-3 Petrel Sub-basin Newby km Field outlines are provided by Encom GPinfo, a Pitney Bowes Software (PBS) Pty Ltd product. Whilst all care is taken in the compilation of the field outlines by PBS, no warranty is provided re the accuracy or completeness of the information, and Curlew it is the 1responsibility of the Customer to ensure, by independent means, that those parts of the information used by it are correct before any reliance is placed on them Offshore Petroleum Acreage Release Area (work program bidding) 2013 Offshore Petroleum Acreage Release Area 3D seismic surveys Gas field Basin outline Sub-basin outline WA Scheduled area boundary (OPGGSA 2006) 2D seismic surveys Petroleum exploration well SA TAS QLD NSW VIC Figure 7 Seismic and well data in the vicinity of the Release Areas in the northern Bonaparte Basin AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 7

8 Petroleum systems elements Northern Bonaparte Basin Sources Reservoirs Seals Lower to Middle Jurassic fluvio-deltaic to marine Plover Middle Upper Jurassic marine claystones of the Laminaria Upper Jurassic Lower Cretaceous marine claystones of the Frigate Shale Lower Cretaceous marine claystones of the Echuca Shoals Upper Cretaceous Puffin basin floor fan sandstones Lower Cretaceous Darwin fractured carbonates Upper Jurassic Lower Cretaceous turbiditic Sandpiper Sandstone Upper Jurassic Lower Cretaceous shallow marine sandstones of the upper Frigate Shale (Flamingo ) Lower Middle Jurassic fluvio-deltaic to marine Plover Regional seals Paleocene marine carbonates of the Johnson Lower Cretaceous marine claystones of the Echuca Shoals Upper Jurassic Lower Cretaceous marine claystones of the Flamingo Group Intraformational seals Upper Jurassic marine siltstones and claystones of the Laminaria (Elang) Upper Cretaceous Wangarlu micaceous marine shales and claystones Traps Faulted anticline, tilted fault block, draped fault blocks, horst and graben, unconformity, and stratigraphic traps Speculative hanging-wall fault traps on the down-thrown side of bounding faults on the Troubadour Terrace Infrastructure and markets Release Areas 14-1, 14-2 and 14-3 are proximal to the Barossa, Caldita, Evans Shoal, Evans Shoal South and Greater Sunrise gas accumulations in Australian waters, and the Abadi gas accumulation in Indonesian waters. The Bayu/Undan to Wickham Point gas pipeline is the closest fixed infrastructure. Critical risks Reservoir quality is an issue due to localised variation in diagenesis and irregularity of the natural fracture networks, which potentially reduce trap capacity and hydrocarbon recoverability. Intra-formational heterogeneity within the reservoir and source rocks of the Plover is a risk. Where developed (e.g. at Sunrise 1) the distribution of shell interbeds play a primary role in vertical reservoir connectivity. Diagenetic variability in reservoirs is likely related to high geothermal gradients as measured at Evans Shoal 1 and Blackwood 1, which may preclude the generation and preservation of liquid hydrocarbons in deeper plays. The complex rifting history and extensive faulting in the region increases the risk of trap breach. Gas flushing is pervasive in the northern Bonaparte Basin and is a major risk for the preservation of liquid hydrocarbons. Gas reservoired within the Plover typically has a high carbon dioxide content. Datasets For the Wells Data Listing go to For the Seismic Surveys Listing go to AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 8

9 Geoscience Australia products Regional geology and seismic Deep Structure of the Eastern Malita Graben and Adjacent Areas in the Timor and Western Arafura Seas: Survey 118 Operational Report, GEOCAT Line Drawings of AGSO Geoscience Australia s Regional Seismic Profiles, Offshore Northern and Northwestern Australia, GEOCAT Stratigraphy Geoscience Australia s Basin Biozonation and Stratigraphy Chart Series: Bonaparte Basin Biozonation and Biostratigraphy Chart 34, GEOCAT Petroleum systems and accumulations Bonaparte Basin, Northern Territory (), Western Australia (WA), Territory of Ashmore and Cartier Islands Adjacent Area (AC), Joint Petroleum Development Area (JPDA), GEOCAT Characterisation of Natural Gases from West Australian Basins, GEOCAT Light Hydrocarbon Geochemistry of the Bonaparte Basin, Including the Sahul Syncline, Malita Graben and Southern Petrel Sub-basin: Rig Seismic Survey 100: Project , GEOCAT Oils of Western Australia II, GEOCAT Petroleum Prospectivity of the East Malita Graben Area, Bonaparte Basin, GEOCAT Quaternary Evolution, Modern Geological Processes and Potential Effects of Additional Petroleum Exploration Activity on the Van Diemen Rise, Timor Sea (East Malita Graben Area), GEOCAT Source Rock Time-slice Maps, Offshore Northwest Australia, GEOCAT The Petroleum Systems of the Bonaparte Basin, GEOCAT Contact Geoscience Australia s Sales Centre for more information or to order these reports or products, phone +61 (0) , sales@ga.gov.au AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 9

10 Key references AGSO, 2001 Line drawings of AGSO Geoscience Australia s regional seismic profiles, offshore northern and northwestern Australia. Australian Geological Survey Organisation Record, 2001/36, 174pp. AMBROSE, G.J., 2004a Jurassic pre-rift and syn-rift sedimentation in the Bonaparte Basin new models for reservoir and source rock development. In: ELLIS, G.K., BAILLIE, P.W. and MUNSON, T.J. (eds). Timor Sea Petroleum Geoscience, Proceedings of the Timor Sea Symposium, Darwin Northern Territory, June 2003, Northern Territory Geological Survey, Special Publication 1. AMBROSE, G.J., 2004b The ongoing search for oil in the Timor Sea, Australia. In: ELLIS, G.K., BAILLIE, P.W. and MUNSON, T.J. (eds), Timor Sea Petroleum Geoscience, Proceedings of the Timor Sea Symposium, Darwin, Northern Territory, June 2003, Northern Territory Geological Survey, Special Publication 1. ANDERSON, A.D., DURHAM, M.S. AND SUTHERLAND, A.J., 1993 The integration of geology and geophysics to post well evaluations example from Beluga-1, offshore northern Australia. The APEA Journal,33(1), BARBER, P., CARTER, P., FRASER, T., BAILLIE, P.W. AND MYERS, K., 2004 Under-explored Palaeozoic and Mesozoic petroleum systems of the Timor and Arafura seas, northern Australian continental margin. In: ELLIS, G.K., BAILLIE, P.W. and MUNSON, T.J. (eds), Timor Sea Petroleum Geoscience, Proceedings of the Timor Sea Symposium, Darwin, Northern Territory, June 2003, Northern Territory Geological Survey, Special Publication 1. BOTTEN, P.R. AND WULFF, K., 1990 Exploration potential of the Timor Gap Zone of Cooperation. The APEA Journal, 30(1), BOURGET, J., AINSWORTH, R.B., BACKE, G. AND KEEP, M., 2012 Tectonic evolution of the northern Bonaparte Basin: impact on continental shelf architecture and sediment distribution during the Pleistocene. Australian Journal of Earth Sciences, 59, BURNS, F.E., THOMPSON, J., AINSWORTH, R.B. AND SEGGIE, R., 2001 Depositional modelling of a deltaic system using ichnofabric analysis; Middle Jurassic Plover, Sunrise-Troubadour gas-condensate fields, Bonaparte Basin, Timor Sea. Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists 2001, 30. CADMAN, S.J. AND TEMPLE, P.R., 2004 Bonaparte Basin, Northern Territory (), Western Australia (WA), Territory of Ashmore and Cartier Islands Adjacent Area (AC), Joint Petroleum Development Area (JPDA), Australian Petroleum Accumulations Report 5, 2nd Edition, Geoscience Australia, Canberra. controller?event=geocat_details&catno=60865 CONOCOPHILLIPS, 2013 [Web page] Barossa Appraisal Drilling Program Fact Sheet. au/en/business/ourprojects/documents/barossa20fact20sheet.pdf (last accessed 8 January 2014). EDWARDS, D.S., BOREHAM, C.J., ZUMBERGE, J.E., HOPE, J.M., KENNARD, J.M. AND SUMMONS, R.E., 2006 Hydrocarbon families of the Australian North West Shelf: a regional synthesis of the bulk, molecular and isotopic composition of oils and gases AAPG International Conference and Exhibition, 5 8 November, Perth, Australia, Abstract. EDWARDS, D.S., KENNARD, J.M., PRESTON, J.C., SUMMONS, R.E., BOREHAM, C.J. AND ZUMBERGE, J., 2000 Bonaparte Basin: Geochemical characteristics of hydrocarbon families and petroleum systems. AGSO Research Newsletter 33, EDWARDS, D.S., PRESTON, J.C., KENNARD, J.M., BOREHAM, C.J., VAN AARSSEN, B.G.K., SUMMONS, R.E. AND ZUMBERGE, J.E., 2004 Geochemical characteristics of hydrocarbons from the Vulcan Sub-basin, western Bonaparte Basin, Australia. In: ELLIS, G.K., BAILLIE, P.W. and MUNSON, T.J. (eds). Timor Sea Petroleum Geoscience, Proceedings of the Timor Sea Symposium, Darwin, June Northern Territory Geological Survey, Special Publication 1, ELLIS, G.K., 1998 Fluid flow, diagenesis and hydrocarbon entrapment history of the Plover, Sahul Platform, Australia. In: PURCELL, P.G. & PURCELL, R.R. (eds). The sedimentary basins of Western Australia 2., Petroleum Exploration Society of Australia. Perth, West, Perth, WA. GORTER, J.D., NICOLL, R.S., METCALFE, I., WILLINK, R.J. AND FERDINANDO, D., 2009 The Permian-Triassic boundary in western Australia: evidence from the Bonaparte and northern Perth basins: exploration implications. The APPEA Journal, 49(1), LABUTIS, V.R., RUDDOCK, A.D. AND CALCRAFT, A.P., 1998 Stratigraphy of the southern Sahul Platform. APPEA Journal 38(1), AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 10

11 LISK, M., GARTRELL, A., BAILEY, W. AND BRINCAT, M., 2006 A holistic model to describe charge and retention history of the northern Bonaparte Basin, Australia. American Association of Petroleum Geologists International Conference Abstracts LONGLEY, I.M., BUESSENSCHUETT, C., CLYDSDALE, L., CUBITT, C.J., DAVIS, R.C., JOHNSON, M.K., MARSHALL, N.M., MURRAY, A.P., SOMERVILLE, R., SPRY, T.B. AND THOMPSON, N.B., 2002 The North West Shelf of Australia - a Woodside Perspective. In: Keep, M. and Moss, S.J. (eds), 2002, The Sedimentary Basins of Western Australia 3: Proceedings of the Petroleum Exploration Society of Australia Symposium, Perth, WA, 2002, LOWE-YOUNG, B.S., RUTLEY, D., SPICER, R.D. AND KLOSS, O., 2004 The Evans Shoal Field, northern Bonaparte Basin. In Ellis, G.K., Baillie, P.W. and Munson, T.J. (eds), Timor Sea Petroleum Geoscience. Proceedings of the Timor Sea Symposium, Darwin, Northern Territory, June Northern Territory Geological Survey, Special Publication 1. MCIYRE, C.L. AND STICKLAND, P.J., 1998 Sequence stratigraphy and hydrocarbon prospectivity of the Campanian to Eocene succession, northern Bonaparte Basin, Australia. The APPEA Journal, 38(1), MORY, A.J., 1991 Geology of the offshore Bonaparte Basin, Northwestern Australia. Geological Survey of Western Australia Report, 29,1 47. NEWELL, N.A., 1999 Water washing in the northern Bonaparte Basin. The APPEA Journal, 39(1), NEWELL, N.A., 2000 Hydrocarbon depletion in the northern Bonaparte Basin; an alternative view. PESA News, No. 48, 17. NORTHERN TERRITORY GEOLOGICAL SURVEY, 1990 Petroleum Basin Study Bonaparte Basin. Prepared by Petroconsultants Australasia Pty Ltd. Northern Territory Government Printer. PRESTON, J.C. AND EDWARDS, D.S., 2000 The petroleum geochemistry of oils and source rocks from the northern Bonaparte Basin, offshore northern Australia. The APPEA Journal, 40(1), PRESTON, J.C., NEWELL, N.A. AND EDWARDS, D.S., 2000 The origin and alteration of hydrocarbons in the northern Bonaparte Basin, offshore northern Australia. AAPG Bulletin, 84, SEGGIE, R.J., AINSWORTH, R.B., JOHNSON, D.A., KONINX, J.P.M., SPAARGAREN, B. AND STEPHENSON, P. M., 2000 Awakening of a sleeping giant; Sunrise-Troubadour gas-condensate field. The APPEA Journal, 40(1), SHUSTER, M.W., EATON, S., WAKEFIELD, L.L. AND KLOOSTERMAN, H.J., 1998 Neogene tectonics, greater Timor Sea, offshore Australia: implications for trap risk. The APPEA Journal, 38(1), WEST, B.G. AND MIYAZAKI, S., 1994 Evans Shoal petroleum prospectivity: new opportunities. Petromin Asia 20, WEST, B.G. AND PASSMORE, V.L., 1994 Hydrocarbon potential of the Bathurst Island Group, northeast Bonaparte Basin: implications for future exploration. The APEA Journal, 34(1), WHIBLEY, M. AND JACOBSON, E., 1990 Exploration in the northern Bonaparte Basin, Timor Sea, WA-199-P. The APEA Journal, 30(1), WHITTAM, D.B., NORVICK, M.S. AND MCIYRE, C.L., 1996 Mesozoic and Cainozoic tectonostratigraphy of western ZOCA and adjacent areas. The APPEA Journal, 36(1), AUSTRALIA 2014 Offshore Petroleum Exploration Acreage Release 11

Areas NT04-1, NT04-2 & NT04-3 Northern Bonaparte Basin Northern Territory. Bids close 31 st March 2005

Areas NT04-1, NT04-2 & NT04-3 Northern Bonaparte Basin Northern Territory Bids close 31 st March 2005 Location Release areas NT04-1, NT04-2 and NT04-3 comprise 56 blocks (4745 km 2 ), 84 blocks (6775 km