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Geological Society, London, Special Publications; 1993; v. 71; p. 163-191;
DOI: 10.1144/GSL.SP.1993.071.01.08
© 1993 Geological Society of London

Seismic sequence stratigraphy and tectonics offshore Namibia

M. P. R. Light, M. P. Maslanyj, R. J. Greenwood & N. L. Banks

Intera Information Technologies, Highlands Farm, Greys Road, Henley-on-Thames, Oxon, RG9 4PS, UK

High quality seismic data recently acquired offshore Namibia have revealed the complex interplay between sedimentation and rifting that accompanied the breakup of Gondwanaland. Seismic sequence analysis has demonstrated a complex series of superimposed phases of rifting.

Jurassic early-rift sediments were deposited in a Basin & Range setting with marine embayments. Mid- to Late Jurassic extension probably culminated in acidic to intermediate volcanicity. Subsequently, late-rift fill sedimentary accumulations were terminated locally by a major period of plateau-forming effusive activity. This was coincident with the start of Early Cretaceous spreading in the South Atlantic. Shelf, slope and basinal facies are clearly defined in the post-rift succession.

Although virtually undrilled, the area is considered to have very considerable petroleum potential. Seismic stratigraphy will continue to play a vital role in defining the critical juxtapositions of source rock, reservoir and seal.





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