TITLE:
The Use of Seismic Attributes to Enhance Fault Interpretation of OT Field, Niger Delta
AUTHORS:
Benard Ifeanyi Odoh, Juliet Nneamaka Ilechukwu, Nnaemeka Ifeanyi Okoli
KEYWORDS:
Dip-Steered Filters, Similarity and Curvature Attributes, Faults, Niger Delta
JOURNAL NAME:
International Journal of Geosciences,
Vol.5 No.8,
July
31,
2014
ABSTRACT:
An
integrated approach to the study of the fault patterns and seismic attributes
was carried out on the OT field using a 3D swamp seismic data
covering approximately 420 Km2 of western belt of the Niger Delta.
This study aimed at improving the visualization of faults in the study area
using different seismic attributes. Three major growth faults dipping south
with few antithetic faults dipping in opposite direction to the growth faults
and other minor faults were identified manually on the original and steered
seismic cube in the inline 11669, while in the cross line only one major fault
was identified manually. The seismic volume was subjected to several stages of
post-stack processing to enhance discontinuities. First, a dip-steering volume
was created. Several dip-steered filters were then applied to enhance faults
and fractures visualization. Finally, similarity and curvature attributes were
calculated on the dip-steered and fault enhanced volume. These final attributes
show detailed geometry of the fault system and the numerous subtle lineaments
in the study area. The integration of the attributes has increased confidence
in the seismic mapping of the faults and the other numerous subtle lineaments
which were difficult to identify on the input data. Similarity and curvature
attributes of the seismic volume preserve subtle structural details and permit
a more robust interpretation of the structures.