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Document Type |
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Article In Journal |
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Document Title |
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Seismic Stratigraphy of the Nile Cone Sediments الاستراتيجيرافية السيزمية لرسوبيات مخروط النيل |
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Subject |
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Earth Sciences |
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Document Language |
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English |
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Abstract |
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Seismic, well velocity, and geologic data have been used to study
the seismic stratigraphy of the Nile cone sediments.. Six seismic regional reflectors
have been identified, described seismically, mapped and correlated in
an attempt to define their ages. These reflectors are: Q, B, L, P, M and N reflectors.
The oldest of them is reflector N, which represents the base of the
Messinian evaporites (distinctive high velocity layer) and floors the cone sediments.
Reflector M is a prominent regional reflector detected only in the cone
area and is considered as a key marker in the Geology of the Mediterranean. It
is a strong well persistent reflector that represents the top of the Messinian evaporites.
The sequence above reflector M in the cone comprises three regional
reflectors, L, B and Q; their postulated ages according to seismic correlation
are: Lower Pliocene, middle Pliocene and lower Pleistocene, respectively. The
stratigraphic sequence on the shelf comprises reflectors Q, B, L and P. Reflector
P is a strong planner reflector that represents a regional erosional surface
of the uplifted middle-upper Miocene shelf. The seismic criteria of reflector
P and M are remarkably different which implies that they have different
origins and show a gradation from deltaic facies (reflector P) to marine basinal
facies (reflector NI). The sequence above reflectors P and M was attributed to
mass movement processes and suspenate deposits and is made up mainly by
slide, slump, channel and turbidite facies and salt flow deposits. These deposits
form different patterns of Seismic facies including; parallel layered,
sheet drape, onlapping fill. sigmoid oblique, chaotic and mounded seismic facies. |
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ISSN |
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1012-8832 |
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Journal Name |
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Earth Sciences Journal |
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Volume |
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9 |
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Issue Number |
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1 |
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Publishing Year |
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1416-1418 AH
1996-1997 AD |
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Number Of Pages |
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25 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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