Evaluation of Different Interbed Multiple Attenuation Techniques, a Case Study from Kuwait
By
Adel El-Emam1, Abdulatif Mohamed1, Will Gowans2
(1) Kuwait Oil Company (KSC), Ahmadi, Kuwait (2) WesternGeco, Salmiya, Kuwait
Seismic
data from the State of Kuwait is typically contaminated with
multiple energy, particularly interbed, that is resistant to conventional data
processing attenuation techniques. Multiples impact the accuracy of structural
and stratigraphic mapping and the reliability of
seismic
attribute
measurements.
The Geophysics Team of Kuwait Oil Company (KSC), Exploration Group, has
implemented a program to test and evaluate
seismic
data processing multiple
attenuation techniques during its major re-processing projects targeted at both
exploration and field development objectives.
Surface and interbed multiples frequently do not exhibit significant velocity
discrimination and are too complex in nature for statistical methods such as
deconvolution to be effective, especially if true amplitudes are to be
preserved. Conventional techniques based on both velocity discrimination and
deconvolution have been ineffective in attenuating multiples in the deep
Jurassic to Permian formations from onshore 3D seismic
data from Kuwait.
This case study will present the different techniques applied and focus on the latest results achieved using an advanced wave equation consistent modeling and adaptive subtraction approach that has been successfully applied for the first time to onshore 3D data. The presentation will review the extensive test work that has been performed to identify the key multiple generating horizons through integrating the skills of the interpretation and processing geophysicists with available VSP and synthetic data.