Your SlideShare is downloading. ×
0
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Samuel Oben Djan,Lead Geoscientist at GNPC - Neoproterozoic plays and hydrocarbon control

484

Published on

Samuel Oben Djan,Lead Geoscientist at GNPC spoke at the Oil & Gas Event June 2013

Samuel Oben Djan,Lead Geoscientist at GNPC spoke at the Oil & Gas Event June 2013

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
484
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide
  • Fieldwork in North Africa including the Taoudenni Basin in Mauritania, Algeria and Mali; the Anti-Atlas region of Morocco and the Cyrenaica, Kufra and Murzuk basins in Libya has added to the understanding of reservoir, source and seal relationships and confirmed the widespread presence of Precambrian potential reservoir facies.
  • Cross-sections through the northern margin of the North Africa basin presented by Lu¨ning et al. (2009) and Rahmani et al. (2009) show the same threefold structural evolution, with active growth faulting during the ‘Glacial’ equivalent extensional phase, followed by Pan-African foreland basin development, and then severe inversion, uplift, erosion and peneplanation during the final stages of the Pan-African Orogeny, before the deposition of theoverlying Palaeozoic succession.
  • Neoproterozoic–Early Cambrian petroleum systems are widely developed globally and our knowledge of them is improving rapidly. The above has added substantially to our understanding of Neoproterozoic–Early Cambrian reservoir, source and seal relationships. This has confirmed the widespreadpresence of stromatolitic carbonate units of potential reservoir facies and of black shales with potential source rock characteristics in many Neoproterozoicsuccessions across North Africa, the Middle East and the Indian Subcontinent. Work is now underway to establish a robust lithostratigraphic and chronostratigraphic framework for the Voltain Basin of Ghana. There is already a widespread and growing perception that these plays will forman important target for future exploration in the, not only on the Voltain Basin, but also Togo and Benin; a perception strongly reinforced by the contributions to this Special Publication.
  • Transcript

    • 1. NEOPROTEROZOIC PLAYS ANDHYDROCARBON CONTROLSamuel Obeng-DjanLead GeoscientistTHE EMERGING POTENTIAL OF THEINLAND VOLTAIAN BASIN OF GHANA
    • 2. OUTLINE Global Hydrocarbon Source Distribution The Global Neo-Proterozoic (Infra-Cambrian)Hydrocarbon Prospectivity Implication to the Voltaian Basin Where next? History of Exploration in Voltaian Basin The Voltaian Basin: Emerging Potential in West Africa
    • 3. THE GLOBAL NEO-PROTEROZOIC (INFRA-CAMBRIAN) HYDROCARBON PROSPECTIVITY
    • 4. WHAT DO WE KNOW ABOUT GLOBALHYDROCARBON OCCURRENCE?Western Canada& Onshore US75,000 Reservoirs/PoolsWestern Canada& Onshore US75,000 Reservoirs/PoolsWestern Canada& Onshore US75,000 Reservoirs/PoolsGLOBAL DISTRIBUTION OF OIL & GAS POOLS – >120,000 fields Nadeau et al. (1995)
    • 5. CIRCLE OF KNOWLEDGEFieldwork in NorthAfrica including theTaoudenni Basin inMauritania, Algeriaand Mali; the Anti-Atlas region ofMorocco and theCyrenaica, Kufra andMurzuk basins inLibya has added to theunderstanding ofreservoir, sourceand seal relationshipsand confirmed thewidespread presenceof Precambrianpotential reservoirfacies.
    • 6. WHAT DO WE KNOW ABOUT PRECAMBRIANPETROLEUM SYSTEMS OF AFRICA ?1EXPLORER’S QUESTIONS1) ARE ALL THESE LOCATIONS THOROUGHLY EXPLORED2) ARE SIMILAR GEOLOGICAL LOCATIONS UNEXPLORED/UNKNOWN3) DO DIFFERENT GEOLOGICAL SCENARIOS EXIST THAT ARE UNTRIEDCRAIG et al, 2009
    • 7. WHAT DO WE KNOW ABOUT PRECAMBRIANPETROLEUM SYSTEMS OF THE AFRICA ?2EXPLORER’S QUESTIONS1) ARE ALL THESE LOCATIONS THOROUGHLY EXPLORED2) ARE SIMILAR GEOLOGICAL LOCATIONS UNEXPLORED/UNKNOWN3) DO DIFFERENT GEOLOGICAL SCENARIOS EXIST THAT ARE UNTRIEDCRAIG et al, 2009
    • 8. WHAT DO WE KNOW ABOUT PRECAMBRIANPETROLEUM SYSTEMS OF THE AFRICA ?3EXPLORER’S QUESTIONS1) ARE ALL THESE LOCATIONS THOROUGHLY EXPLORED2) ARE SIMILAR GEOLOGICAL LOCATIONS UNEXPLORED/UNKNOWN3) DO DIFFERENT GEOLOGICAL SCENARIOS EXIST THAT ARE UNTRIEDCRAIG et al, 2009
    • 9. The Neoproterozoic–Early Cambrian period canbe broadly divided into three distinct phasesrelated to global tectonics and climate:1. Tonian–Early Cryogenian: c.1000–750 Ma;2. Mid-Cryogenian–Mid-Ediacaran: c. 750–600 Ma;3. Late Ediacaran–Early Cambrian: c. 600–500Ma.THE NEOPROTEROZOIC–EARLY CAMBRIANPERIOD
    • 10. The Late Ordovician–Early Silurian petroleum system in North Africa – an analogue forthe Voltain Neoproterozoic reservoir–source rock relationships?
    • 11. THE NEOPROTEROZOIC–EARLY CAMBRIAN PERIOD CON’T• Recent fieldwork in the Taoudenni Basin in Mauritania• The Anti-Atlas region of Morocco• The Al Kufrah Basin in Libya,• The Naguar–Ganganagar Basin of Rajasthan,• The Son Valley of central India• The Himalayan foothills of NW India by members ofthe Maghreb Petroleum Research Group
    • 12. Where next?THE VOLTAIN BASIN• One of the four (4) sedimentaryBasins of Ghana• It is the largest sedimentary basin inGhana• An Inland basin of size 103,600 sqkm (covers about 40% of Ghana’sland mass)• Basin extends into Togo and BeninVOLTAIAN
    • 13. ©GNPC 2013Exploration History• Romania Reconnaissance Geological Workfrom 1925-1932• P. Davis Gravity Survey from 1957-1958• Ghana/USSR borehole drilling from 1962-1965• Shell/CGG Airborne Magnetic Survey from1970-1971 (Premuase -1 Well)
    • 14. ©GNPC 2013• EU/ GOG funded MSSP data• Limited seismic data (208 km 2-D)• Shallow Premuase-1 well (1167m) or 3830 feet• Deep water borehole (700m)• Various individual reports dealing with variousaspects of the basin’s geology and geophysicsDATA BASE
    • 15. ©GNPC 2013Geology• Thick Voltaian sediments, overlie non-conformably onPrecambrian to lower Paleozoic formations.• The Voltaian is an asymmetrical depression filled withsediments of Late Precambrian or Infra-Cambrian toLower Paleozoic age.• Some areas are considered as young as DevonianCarboniferous in age, with thickness of over 6,000m.• The Lithology comprises ofsandstones, mudstone, shale and limestone. Thesandstones are massive and conglomeratic in places.
    • 16. ©GNPC 2013GEOLOGICAL MAP
    • 17. MSSP Data interpretation• a major deep basin underliesthe centre of the surveyarea, with a second shallowersub-basin located to thenortheast• Thickness of the varioussections of the basin rangesfrom deepest (> 6000m); in thenorthern & southern half of thebasin.• Shallower zones of 500mdepth mapped in SW & fringesbasin.• Averagely, the whole basin hasover 1000m sediment
    • 18. ©GNPC 2013• Gas shows were also reported from someof the water bore-holes drilled.• The basin deepened in the center andstratigraphic traps were likely to occur.• Some of the bore-holes showed traces ofheavy oil.WHY SO MUCH INTEREST?
    • 19. ©GNPC 2013WHY SO MUCH INTEREST?• Bitumen found impregnated inlimestone, shale and sandstonesequence forming the middle Voltaian• Saline waters that are associated withhydrocarbons were found in thesebore- holes and were also found to beof a chloro-calcic content
    • 20. ©GNPC 2013WHY SO MUCH INTEREST?• > 6000m of sediment fill in thebasin.• The lower members of the Voltaianrocks are folded.• It also revealed the occurrence oflimestone and other sandstones thatcould serve as reservoir rocks.
    • 21. ©GNPC 2013WHAT’S NEXT?• INITIAL PHASE General geological and geophysical (G&G) Studies, Review &Interpretation of MSSP Data. Satellite Imagery and Aero-photo Acquisition and Interpretation Reconnaissance Geological Fieldwork Integration of all G&G information to form the basis of selection oflocations for slim hole drilling Actual Slim-hole Drilling Operations Laboratory Analyses & interpretation of field samples and conclusions
    • 22. Voltaian Basin-Current Status• Evaluation & Award of contract for thedrilling of slim holes is underway• Analysis of the data will establish thepetroleum system and enhance theknowledge base• That will end Phase I ( expected to becompleted by the end of the year 2013)• Phase II will begin with Investorparticipation.
    • 23. ©GNPC 2013Join us in Phase IIThank You23

    ×