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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Seismic
Frequencies: a Robust
Interpretation
Tool
1 Saudi Aramco, Saudi Aramco, P.O.Box 5860, Dhahran, 31311, Saudi Arabia, phone:
+96638757977, fax: +96638731007, [email protected]
2 Saudi Aramco
Amplitude and Frequency are the main seismic
attributes that are being used in
seismic
interpretation
and stratigraphic
analysis. The amplitude attribute which is a layer boundary attribute was being studied in both pre -stack and post-stack
domains. However, the utilization of the frequency attribute which is an intrinsic attribute not like the amplitude attribute is
not as popular. I think both of the attributes compliments each other.
In this paper, I want to shed light on some of the uses of seismic
frequency
data
in the
interpretation
field and how robust it
is in providing important tool to map reservoir quality, thickness and fluid type.
Pre-stack frequency analysis is one of the tools investigated. I found that using mid offset stack attenuation attribute is the
best in mapping areas with excellent reservoir filled with gas. This can be attributed to the quality of the data
, less multiple
effects and less noise, and might be also related to the angle of incidence.
Post-stack data
were also investigated and I found that frequency tunning phenomenon can be used to map pinch-outs
which can be used to delineate channels or any other geological features. We have extended this knowledge to even
estimate thickness of thin reservoirs.