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 Volcanism Structural Setting Hydrocarbon Play Indicators Source rocks Reservoirs Traps Seals Concluding Remarks Key facts about Uganda Investment Opportunities

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

Summary tectonic map of the Albertine Graben 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

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

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

HYDROCARBON PLAY INDICATORS Cont’d Reported Oil Seeps 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

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

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

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

HYDROCARBON PLAY INDICATORS Cont’d Semliki structures 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) CO2 not extensive Gravity reveals other significant subsurface structures also confirmed by seismic Saddlebill Residual gravity anomaly map of Semliki Basin, EA3A

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 Mputa #1 Waraga #1 General geology of Kaiso-Tonya showing the Mputa and Waraga well location

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

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

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

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

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

INVESTMENT OPPORTUNITIES AVAILABLE ACREAGE 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 EA4 Lakes Edward-George Basin Size: 5,910 Sq. Km Not yet licensed 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 Exploration Area 3 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

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

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