1887
Volume 24, Issue 3
  • ISSN: 1354-0793
  • E-ISSN:

Abstract

Interpretation of a 20 550 line km 2D seismic survey acquired in 2014 by Soma Oil and Gas in the deep water offshore area of SE Somalia has identified three previously undocumented sedimentary provinces – Jubba Deep, Mogadishu Deep and Mid Somalia High – all of which have distinctive geological characteristics. Well and stratigraphic controls are limited, with inferred lithologies largely based on seismic stratigraphic interpretation.

The Jubba Deep has a thick Late Cretaceous–Early Tertiary deltaic section deformed by major gravitational collapses in the Paleocene-age Kismaayo Thrust Belt (KTB) and the Pliocene-age Baraawe Thrust Belt (BTB). It is proposed that the KTB has significant hydrocarbon potential in deltaic and pro-delta sands trapped in thrust anticlines and sourced with oil from Mid-Cretaceous mobile shales.

The Mogadishu Deep Basin has a thick Mesozoic and Tertiary section but is missing the thick deltaics seen in the Jubba Basin. Volcanics are present in this basin.

The Mid Somalia High has a relatively thinner sedimentary section where Cretaceous and Jurassic reservoirs and potential source rocks are at moderate burial depths. An extensive post-rift Mid–Late Jurassic carbonate platform is developed here with potential hydrocarbon targets in interpreted reefs and shoal facies.

: Additional seismic examples and map figures are available at https://doi.org/10.6084/m9.figshare.c.3902650

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2017-11-09
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References

  1. Barnes, S.U.
    1976. Geology and oil prospects of Somalia, East Africa. AAPG Bulletin, 60, 389–413.
    [Google Scholar]
  2. Bosellini, A.
    2008. The continental margins of Somalia; structural evolution and sequence stratigraphy. In: Watkins, J.S., Zhiqiang, F., McMillen, K.J. (eds) Geology and Geophysics of Continental Margins. American Association of Petroleum Geologists, Memoirs, 53, 185–205.
    [Google Scholar]
  3. Bustin, R.M.
    1988. Sedimentology and characteristics of dispersed organic matter in Tertiary Niger Delta: origin of source rocks in a deltaic environment. AAPG Bulletin, 72, 277–298.
    [Google Scholar]
  4. Cobbold, P.R., Clarke, B.J. & Løseth, H.
    2009. Structural consequences of fluid overpressure and seepage forces in the outer thrust belt of the Niger Delta. Petroleum Geoscience, 15, 3–15, https://doi.org/10.1144/1354-079309-784
    [Google Scholar]
  5. Coffin, M.F. & Rabinowitz, P.D.
    1992. The Mesozoic East African and Madagascan conjugate continental margins: stratigraphy and tectonics. In: Watkins, J.S., Zhiqiang, F., McMillen, K.J. (eds) Geology and Geophysics of Continental Margins. American Association of Petroleum Geologists, Memoirs, 53, 207–240.
    [Google Scholar]
  6. Cruciani, F. & Barchi, M.R.
    2016. The Lamu Basin deepwater fold-and-thrust belt: An example of a margin scale, gravity-driven thrust belt along the continental margin of East Africa. Tectonics, 35, 491–510, https://doi.org/10.1002/2015TC003856
    [Google Scholar]
  7. Cruciani, F., Barchi, M.R., Koyi, H.A. & Porreca, M.
    2017. Kinematic evolution of a regional scale gravity-driven fold-and–thrust belt: The Lamu Basin case-history (East Africa). Tectonophysics, 712–713, 30–44.
    [Google Scholar]
  8. Greenlee, S.M. & Lehmann, P.J.
    1993. Stratigraphic framework of productive carbonate buildups. In: Loucks, R.G. & Sarg, J.F. (eds) Carbonate Sequence Stratigraphy: Recent Developments and Applications. American Association of Petroleum Geologists, Memoirs, 57, 43–62.
    [Google Scholar]
  9. Harms, J.C. & BradyM.J.
    1989a. Oil and Gas Potential of the Somali Democratic Republic, I Jubu-Lamu and Mandera-Lugh Basins. Report prepared for the Ministry of Mineral and Water Resources, Mogadishu, Somalia Democratic Republic.
    [Google Scholar]
  10. 1989b. Oil and Gas Potential of the Somali Democratic Republic, II Obbia and Coriole Basins. Report prepared for the Ministry of Mineral and Water Resources, Mogadishu, Somalia Democratic Republic.
    [Google Scholar]
  11. Kenter, J.A.M., Harris, P.M. & Collins, J.F.
    2008. Facies and reservoir quality of the Tengiz isolated platform, Pricaspian Basin, Kazakhstan. Search and Discovery Article 20048, AAPG and AAPG European Region Energy Conference & Exhibition , 18–21 November 2007, Athens, Greece.
  12. Kiessling, W., Flugel, E. & Golonka, J.
    1999. Paleoreef Maps: Evaluation of a comprehensive database of Phanerozoic reefs. AAPG Bulletin, 83, 1552–1587.
    [Google Scholar]
  13. Mahanjane, E.S. & Franke, D.
    2014. The Rovuma Delta deep-water fold-and-thrust belt, offshore Mozambique. Tectonophysics, 614, 91–99.
    [Google Scholar]
  14. Morley, C.J, King, R., Hillis, R., Tingay, M. & Backe, G.
    2011. Deepwater fold and thrust belt classification, tectonics, structure and hydrocarbon prospectivity: A review. Earth-Science Reviews, 104, 41–91.
    [Google Scholar]
  15. Neuhause, D., Borgomano, J., Jauffred, J.C., Mercadier, C., Olotu, S. & Grötsch, J.
    2004. Quantitative seismic reservoir characterization of an Oligocene–Miocene carbonate buildup: Malampaya field, Philippines. In: Eberli, G.P., Masaferro, J.L. & Sarg, J.F. (eds) Seismic Imaging of Carbonate Reservoirs and Systems. American Association of Petroleum Geologists, Memoirs, 81, 169–183.
    [Google Scholar]
  16. Ulmishek, G.F.
    2004. Petroleum Geology and Resources of the Amu-Darya Basin, Turkmenistan, Uzbekistan, Afghanistan and Iran. United States Geological Survey Bulletin, 2201-H.
    [Google Scholar]
  17. United States Geological Survey
    . 2012. Assessment of Undiscovered Oil and Gas Resources of Four East Africa Geologic Provinces. Published as part of World Petroleum Resources Project, https://pubs.usgs.gov/fs/2012/3039/contents/FS12-3039.pdf
    [Google Scholar]
  18. Webster, R.E. & Ensign, P.S.
    2007. Exploring the Jurassic Carbonate Platform Margin, Majunga Basin, Madagascar. Search and Discovery Article 10128, AAPG Annual Convention , 1–4 April 2007, Long Beach, California, USA, http://www.searchanddiscovery.com/documents/2007/07049webster/index.htm
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