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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.