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Reuben Kashambuzi Commissioner, Petroleum Exploration and Production Department, Uganda

PETROLEUM POTENTIAL OF THE ALBERTINE GRABEN, UGANDA, CONFIRMED. Presented By. Reuben Kashambuzi Commissioner, Petroleum Exploration and Production Department, Uganda at the AAPG Convention 2006, Houston, Texas, USA. PRESENTATION OUTLINE. Regional Setting of the Albertine Graben EARS

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Reuben Kashambuzi Commissioner, Petroleum Exploration and Production Department, Uganda

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  1. PETROLEUM POTENTIAL OF THE ALBERTINE GRABEN, UGANDA, CONFIRMED Presented By Reuben Kashambuzi Commissioner, Petroleum Exploration and Production Department, Uganda at the AAPG Convention 2006, Houston, Texas, USA

  2. PRESENTATION OUTLINE • Regional Setting of the Albertine Graben • EARS • Volcanism • Structural Setting • Hydrocarbon Play Indicators • Source rocks • Reservoirs • Traps • Seals • Concluding Remarks • Key facts about Uganda • Investment Opportunities

  3. REGIONAL SETTING • The EARS bifurcates into two arms • Eastern and Western arms separated by Tanzanian Craton • Northern most part of the Western arm of the East African Rift System • 500 Km long, averaging 45 km wide and 23,000 sq km • Volcanic processes are not widespread in the Western arm as they are in the Eastern arm Ethiopian rift Albertine Graben Aswa Shear Zone Tanzanian Craton EARS

  4. STRUCTURAL SETTING • Grabens and half grabens separated by accomodation zones • Graben strongly shaped by; • Continental Extension – NW-SE • Strike slip • Three structural domains: • Northern trends in a NNE-SSW • Central trends in a NE-SW • Southern trends in a NNE-SSW • Central Domain: Orthogonal extension • Northern & Southern Domains: Oblique Extension Summary tectonic map of the Albertine Graben

  5. HYDROCARBON PLAY INDICATORS Source Rocks: • Rocks with good source potential have been mapped in the Graben e.g. Kaiso Tonya. • Good source rocks reported in the Waki-B1, Turaco, Mputa and Waraga wells • Inferred from oil seeps • High quality lacustrine mature source rocks encountered in the wells drilled on the Turaco, Mputa and Waraga prospects. Kaiso-Tonya shale

  6. HYDROCARBON PLAY INDICATORS Cont’d ☼ ☼ Turaco-2 Lithology log. Good source rocks were reported in the well Waki B-1 Lithology log. Excellent source rocks were encountered

  7. Reported Oil Seeps HYDROCARBON PLAY INDICATORS Cont’d Oil Seepages • Distributed along the entire length of the Albertine Graben • Different geochemical characteristics indicating multiple sourcing Radar Imagery of the Albertine Graben showing interpreted and confirmed oil seeps

  8. HYDROCARBON PLAY INDICATORS Cont’d Oil Seepages Oil Seepage in highly crushed basement at the Kabyosi oil seep in Kaiso – Tonya area Oil film floating on the Victoria Nile Oil seep from shallow well at Kibiro 23 Oil impregnated channel sandstone of the Kaiso FM on the banks of R. Hohwa

  9. HYDROCARBON PLAY INDICATORS Cont’d Reservoir rocks: • Thick (100-200m) and well sorted sandstones • Good porosities of the order of 30% • Good permeability • Multiple pay zones confirmed by drilling (Mputa-1 and Waraga-1) Sebugoro Formation Hohwa oil sandstone Kisegi Formation

  10. HYDROCARBON PLAY INDICATORS Cont’d Traps: • Sedimentary structures in the Graben are basement related • Residual gravity anomalies reveal several structures • Structures have been confirmed by seismic data and tested by exploration drilling • Compares well with Sudan where major oil fields coincide with gravity highs Residual gravity anomaly map of EA2, showing distribution of gravity highs oil seepages and well locations

  11. HYDROCARBON PLAY INDICATORS Cont’d • Turaco-1,2&3 drilled on a gravity high • Turaco – Encountered natural gas contaminated with CO2 in the ratio CH4 : CO2 of 1:4 • Good reservoirs • High flow rates (60 mmcft/d) • Good seals • Good source rock quality • Multiple reservoirs • Shallow biogenic (?) gas (600-700m depth) • CO2not extensive • Gravity reveals other significant subsurface structures also confirmed by seismic Semliki structures Saddlebill Residual gravity anomaly map of Semliki Basin, EA3A

  12. Waraga #1 Mputa #1 HYDROCARBON PLAY INDICATORS Cont’d Kaiso-Tonya structures • Mputa and Waraga Prospects tested by exploration drilling • Rich shales • Oil shows • Oil samples extracted for lab. analyses • Multiple reservoirs • Thin sandstones • Shows in fractured basement • Wells cased and suspended for re-entry for testing General geology of Kaiso-Tonya showing the Mputa and Waraga well location

  13. HYDROCARBON PLAY INDICATORS Cont’d Kaiso-Tonya structures • Mputa and Waraga Prospects coincide with significant gravity highs • The gravity structures have been confirmed by seismic data • Prospectivity of other structures still to be confirmed Residual gravity anomaly map of Kaiso-Tonya, EA2

  14. HYDROCARBON PLAY INDICATORS Cont’d Typical traps • Flower Structures • Rollover anticlines • Inversion anticlines • Potential for stratigraphic traps Seismic section showing an inversion anticline in Semliki Basin

  15. Inversion Anticline Syncline 5 Km HYDROCARBON PLAY INDICATORS Cont’d Traps Cont’: • Structural highs observed on the seismic sections are potential hydrocarbon traps - inversion anticlines • Structural lows represent possible ‘Kitchens’

  16. HYDROCARBON PLAY INDICATORS Cont’d Seals: • Alternating shales and sandstones observed in Waki-B1 well suggest good sealing mechanism • Wide spread clays, some quite thick, provide regional seals. Clays have been mapped across the Albertine Graben • Observations from Turaco, Mputa and Waraga exploration wells confirm effective seals Waki B-1 well lithology. Oil shows were encountered at 3850 ft

  17. KEY FACTS ABOUT UGANDA • Population Size:27 million people • Size of country:241,038 Sq. Km • GDP:US$ 6.8 Billion • Export Earnings: US$ 547.5 Million (2004) • Fuel Consumption: 681,248.8 m3 (US$ 156.9 m/year), 2005 • Installed Capacity: 300 MW of electricity • Available Power: 140 - 220 MW of electricity • Power demand: ~ 500 MW of electricity • Power shortage:Effect of prolonged drought • Thermal Generation:50 MW to increase to 200 MW (End 2006) Confirmation of shallow gas in Turaco would alleviate the problem

  18. Exploration Area 3 • EA5 Rhino Camp Basin • Size: 6,040 Sq. Km • Licensed: Neptune Petroleum (U) Ltd on 27th Sept 2005 • EA1 Packwach Basin • Size: 4,285 Sq. Km • Licensed: Heritage Oil and Gas (U) Ltd on 1st July 2004 • EA2 Lake Albert Basin • Size: 4,675 Sq. Km • Licensed: Hardman Resources (U) Ltd on 8st October 2001 • EA3A Semliki Basin • Size: 1,982 Sq. Km • Licensed: Hearitage Oil and Gas and Energy Africa on 8th Sept 2004 • EA3B Semliki Basin • Size: 1,795 Sq. Km • Not licensed • EA4 Lakes Edward-George Basin • Size: 5,910 Sq. Km • Not yet licensed INVESTMENT OPPORTUNITIES AVAILABLE ACREAGE Exploration Area 4 • 5,910 Sq. Km • Acreage on land and on the lake • Geological & Geophysical data • Sediment thickness, over 4 Km Exploration Area 3B • 1,795 Sq. Km • 390 Sq. Km of 3D seismic data • 410 Line Km of 2D seismic data • Lithology and wire line data from 3 wells • Structures with potential for ; • Gas condensate • Shallow biogenic gas • High quality reservoir conditions established

  19. PLEASE CONTACT Uganda Booth No. 461 at the International PavilionOR.The Commissioner,Petroleum Exploration and Production Department,21–29 Johnston RoadP. O. Box 9,Entebbe (Uganda)Tel:+256 041 320714Email:pepdebb@africaonline.co.ugWebsite: www.energyandminerals.go.ug

  20. THANK YOU

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