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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Seismic
to Meet its Objectives: A Case History
1 Expl/Geophysics, ADCO, P.O.Box 270, Abu Dhabi, United Arab Emirates, phone: +9712-
6043340, fax: +9712-6652063, [email protected]
2 Expl./Geophysics, ADCO, P.O.Box 270, Abu Dhabi, United Arab Emirates
Objectives:
A 3D seismic
survey was acquired in 1992 over a Carbonate field in the Arabian Gulf area with parameters that were
considered adequate at that time. The fold of this vibroseis
data
is 32. The
data
set suffered from multiples, statics and low
signal to noise ratio. Imaging of the subsurface fault patterns and improving the
data
quality to allow for confident
interpretation
of the sedimentary section for exploration and field-development purposes were of great importance.
Procedures: In recent reprocessing careful attention was given to horizon-based stacking velocity picking and the selection
of accurate refraction static model. This resulted in data
with good lateral continuity. The reprocessed and interpreted
seismic
data
were used for the new generation of reservoir model for the field. It helped in the selection of new wells.
Detection of the internal geometry within the reservoirs using
seismic
amplitudes was necessary.
Results and Conclusions:
Although reprocessing of this seismic
data
has shown improvements in horizon tracking and fault imaging but it was not
enough. Reprocessing of the
data
has been taken to its technical limit and can not produce the needed high resolution
image to meet the team objectives. The mapping of many reservoir units was not possible with this
data
due to its poor
vertical resolution. Deterministic and statistical studies clearly indicated the value gained from acquiring new high resolution
3D
seismic
far exceed the cost of acquisition.
Acknowledgments: The Authors would like to thank ADCO and ADNOC for their permission to publish this material.