--> Abstract: Application of Sequence Stratigraphy to Neritic Sediments of the Niger Delta, by T. McHargue, J. Diedjomahor, I. Arowolo, R. Hobbet, and V. Onyia; #90990 (1993).
[First Hit]

Datapages, Inc.Print this page

McHARGUE, TIM, JACOB DIEDJOMAHOR*, ISAAC AROWOLO, RANDALL HOBBET, and VALENTINE ONYIA, Chevron Nigeria Limited, Lagos, Nigeria

ABSTRACT: Application of Previous HitSequenceNext Hit Stratigraphy to Neritic Sediments of the Niger Delta

Previous HitSequenceNext Hit stratigraphy is an approach to correlation that emphasizes regional unconformities as the basis for subdividing sediments into time-equivalent packages called sequences. In Chevron's acreage in the northwestern Niger delta, three-dimensional (3-D) Previous HitseismicNext Hit data have been used to map each Previous HitsequenceNext Hit-bounding unconformity based on the presence of a submarine canyon near the paleoshelf edge. Erosion lateral to each canyon is slight or even absent.

Useful criteria for recognizing Previous HitsequenceNext Hit Previous HitboundariesNext Hit in 3-D Previous HitseismicNext Hit data in neritic sediments of the Niger delta are (1) truncation of underlying reflections, (2) drape, dip discordance, or onlap of younger reflections over topography on the Previous HitsequenceNext Hit boundary, (3) contrast in Previous HitseismicNext Hit attributes across the Previous HitsequenceNext Hit boundary, and (4) termination of faults at the Previous HitsequenceNext Hit boundary.

Published criteria for recognizing Previous HitsequenceNext Hit Previous HitboundariesNext Hit from logs and paleontological data are being adapted to the Niger delta, where high-frequency fourth-order sequences are strongly developed.

Identifying and mapping Previous HitsequenceNext Hit Previous HitboundariesNext Hit is beneficial because Previous HitsequenceNext Hit Previous HitboundariesNext Hit (1) may form truncation traps where shales of the younger Previous HitsequenceNext Hit overlie truncated sands of the older Previous HitsequenceTop, (2) assist correlations across faults, (3) subdivide the section into units of genetically related sediments, and (4) provide an objective basis for regional correlations.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.