The Namibian Atlantic Margin south of the Walvis Ridge: piecing together the jigsaw of a potentially prospective new frontier Tuesday 18th November 2014 PETEX 2014 Conference, London
Presentation Outline Location Seismic & Well Data Exploration History Regional Geology South Atlantic Context Key Plays Syn-rift clastic & carbonate plays Post-rift turbidite, shelf and toe-thrust plays Source Rocks Regional Top Seal…
Namibia Location and Database Offshore Namibia Namibe extends some 1500 km Basin from north to south Extensive 2D and 3D seismic data Walvis Basin Only 16 exploration wells drilled offshore SWAKOPMUND One well per 22,000…
Namibia Early Exploration History Pre-2012 Namibe Basin 200km Aptian-Albian Thick Aptian-Albian shelf carbonates Until 2012, only ten exploration wells had been 1911/15-1 Oil shows in drilled offshore Aptian carbonates The…
Namibia Early Exploration History Pre-2012 (Correlation after NAMCOR) Upper Cretaceous deep marine sandstones sands Top Cretaceous Orange Palaeo- Top Delta Cenomanian Upper Upper&&Lower Mid Aptian Aptian- Cretaceous…
Namibia Recent Exploration History 2012 to Present Day 200km Tapir 1811/5-1 Structural target; found high- Six wells drilled 2012 to Namibe Basin quality Upper Cretaceous sands and porous Lower Cretaceous present day (wells not…
Namibia Regional Geology (Geological Sections after Gladzenco et al, 1998) Wingat Discovery Residual Bouguer Gravity (offset) 200km Line A SDRs Congo Craton Jurassic early Cretaceous Outer Rift Walvis Basin 2513/8-1…
Namibia: South Atlantic Context Lentini et al, 2010; Torsvik et al 2009 Berriasian / Valanginian, 137 Ma Paran-Etendeka flood basalts 137- 127 Ma centred on a mantle plume under what is now the Walvis Ridge Most volcanics are…
South Atlantic: Palaeogeography 130 & 120Ma (Robertson, 2010) Syn-Rift, Barremian 130Ma Post-Rift, Aptian 120Ma Prolific carbonate Salt Basins reservoirs and lacustrine source rocks Paran-Etendeka flood basalts (Namibian side…
Geoseismic Section Luderitz Basin Key Plays 10 km 2513/8-1 WSW (projected) ENE sTWT 0 Post-rift / drift fill Clastic reservoir Clastic shelf Carbonate reservoir Clastic Carbonate shelf Source rock Shelf Play Late Syn-rift /…
Serica 3D Seismic Section Illustrating Key Plays across the Luderitz Basin Platform Turbidite Aptian Canyon Upper Cretaceous Line: SW 4123.0 4131.0 4139.0 4148.0 4156.0 4164.0 4172.0 4180.0 4340.0 4643.0 4946.0 NE 5250.0 5553.0…
Late Syn-Rift Plays (Barremian) Carbonate Platform Play 2513/8-1 Kudu Gas Field 2513/8-1 Aeolian to transgressive marine reservoir Aeolian Kudu Play
Aeolian Kudu Play Huab Sandstone & Etendeka Volcanics, Namibia
Kudu Field Reservoir Model (after Tullow) Regional high with localised A dry aeolian (Huab- aeolian volcanics shallow Etendeka) aeolian marine sand reservoir is commonly assumed within the basaltic Hydrocarbon charge section,…
Kudu Field Reservoir coquina, The aeolian section of the Kudu 9A-2 Kudu Shale Kudu 9A-2 Kudu reservoir has a marked wet component Overlying transgressive marine sandstones contain both thick carbonate beds and thin…
Carbonate Platform Play Driedoornvlakte, Namibia (Adams et al, 2004) Neo-Proterozoic microbial-dominated carbonate platform, Nama Group, Central Namibia (potential analogue for Lower Cretaceous carbonate play)
Carbonate Platform Play Serica 2012 3D seismic data N Prospect B 128 Ma Prospect B Prospect B 128 Ma Fast track TWT interpretation Prospect B 570 km2 areal closure and 300 m relief Billion-barrel resource potential…
Carbonate Platform Play (Serica 2012 3D seismic data; flattened on 0.25 * seabed) Prospect B sTWT Low angle sigmoidal Strongly layered Top Albian WSW ENE clinoforms & mounding internal platform 101 Ma Clinoforms Mid Aptian…
Carbonate Play Seismic Attributes Instantaneous Phase, Perspective View 60 ms below 129 Ma (flattened) NW Corner Zoom North Patch Reefs Scalloped margin vents vent Western edge of clinoforms Minor fault…
Malaysia Carbonate Platform Analogue (Vahrenkamp et al, 2004; King King et al, 2010) Luconia Carbonate Platform Luconia Carbonate Platform (Oligo-Miocene) Layered facies Clinoformal margin Chaotic /mounded facies Serica…
Early Post-Rift Plays (Aptian-Albian) Wingat Oil Discovery 2513/8-1 Two proven Aptian marine source rocks 41 API oil sampled via MDT After HRT 2513/8-1
Turbidite Channel & Shelf Edge Plays 200km Pancontinental / Tullow Namibe Basin Walvis Basin Chariot Luderitz Basin Serica acreage Serica Kudu Field
Turbidite Channel & Shelf Edge Plays Serica 2012 3D seismic data Aptian 122Ma Depth / Slice Aptian shelf Channel edge leads Leads Shelf Leads Major canyon incision Base of slope shelf pinch- pinch- out & onlap…
Turbidite Channel & Shelf Edge Plays Serica 2012 3D seismic data N Canyon Shelf edge Interbedded with Kudu leads Shale source rock with direct access to mature Channel source kitchens to the Lead north and south Base of slope…
Aptian Shelf AVO Play Serica 2012 3D seismic data, XL3280 (nears & fars) WSW ENE Prominent soft seabed Class II/III AVO stacked anomalies brightening on fars Shallow marine shelf sands or carbonate shoals Lead F Directly up-dip…
Toe Thrust Play WSW-ENE 2D Seismic Line south of Serica Acreage Line ECL89-24 Fluid escape features associated with listric faulting Deep-water fold & thrust belt Dcollement along Cenomanian / Turonian shale
Source Rocks 10 km 2513/8-1 WSW (projected) ENE sTWT 0 Post-rift / drift fill Clastic reservoir Clastic shelf Carbonate reservoir Carbonate shelf Source rock Late Syn-rift / sag Hydrothermal vent 1 Volcanics / SDRs Igneous…
Post Rift Namibian Source Rocks Latest Barremian to Early Aptian Aptian Source Rocks Aptian Source Rock Maturity encountered by drilling (after Bray et al, 1998) Narrow, restricted Red-Sea type Wingat Oil Discovery marine basin…
Post Rift Namibian Source Rocks Late Barremian to Early Aptian Kudu Shale Kudu 9A-3 Kudu 9A-3 Kudu 9A-2 Aptian Aptian (Bray et al, 1998) Unconformity Unconformity 380m early Aptian late Barremian high GR shale Kudu Shale…
Source Rock Maturity Hodgson et al, 2014; Interwong et al, 2014 2513/8-1 anomalously cool shelf well Serica acreage ODP 1084A 30C/km Source Rock maturity estimated independently using gas hydrate bottom-simulating…
Regional Top Seal No Aptian salt seal However, pressure data proves a highly effective regional Aptian-Albian shale top seal 1911/10-1: 1392 psi overpressure in Aptian carbonates Walvis Basin Kudu Gas Field Wingat…
Conclusions zzz Offshore Namibia remains vastly under-explored However, drilling has confirmed all elements of a working hydrocarbon system Proven high-quality clastic and carbonate reservoirs Typical West African shelf-slope…
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