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NDX Ayuk

The document presents a sedimentological and sequence stratigraphic analysis of the Qua-Iboe Channel Complex in the South-East Niger Delta, focusing on its ancient channel deposits. It details the mapping of the deposit's top and base, internal reflection configurations, and the generation of seismic maps to study structural configurations. The findings indicate a lowstand prograding wedge formed under significant marine influences, with sediment thickness varying between 100m to 420m and showing trends correlating with sea level changes.

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16 views1 page

NDX Ayuk

The document presents a sedimentological and sequence stratigraphic analysis of the Qua-Iboe Channel Complex in the South-East Niger Delta, focusing on its ancient channel deposits. It details the mapping of the deposit's top and base, internal reflection configurations, and the generation of seismic maps to study structural configurations. The findings indicate a lowstand prograding wedge formed under significant marine influences, with sediment thickness varying between 100m to 420m and showing trends correlating with sea level changes.

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Dd
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Sedimentology and Sequence Stratigraphic Analysis of the Qua-Iboe Channel Complex, Offshore

South East Niger Delta

Michael A. Ayuk 1, Moses A. Olorunniwo 2, John S. Ojo 1, and Bankole D. Ako 2


1
Department of Applied Geophysics, Federal University of Technology, Akure, Nigeria.
2
Department of Geology, Obafemi Awolowo University, Ile-Ife, Nigeria.

The Qua-Iboe member is an ancient channel deposit located at the extreme flank of South-East Niger
Delta. The top and base of the deposit were mapped from reflection termination styles of top-lap and
erosional truncation. Internal reflection configurations range from chaotic to sub parallel; while in
some places diffraction hyperbolae are observable. Further analysis of well logs stacking patterns and
lithological descriptions from ditch cuttings also aided in the identification and mapping of the channel.

Seismic maps such as depth, Isopach and Isovelocity were generated to study the structural
configuration of the formation. Depth structure map of the base reveals that the axis of the channel
trends in SW to NE direction with a sediment thickness ranging from 100m to 420m. Lithological
observations from gamma ray and ditch cuttings range from shale, sandy-shale and shaly-sand which
were deposited under significant marine influences. Gamma ray logs show both fining upward and
coarsening upward trends of rock units which are correlatable between wells and interpreted to be the
result of relative rise and fall of sea level. The channel deposit is seen as a lowstand prograding wedge
that developed during an interval of relatively high sediment supply and a variable rising sea level.

AAPG Search and Discovery Article #90115©2010 AAPG Africa Region Annual Conference, Abuja, Nigeria, 14-19 November 2010.

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