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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Seismic
Interpretation
Consulting Reservoir Geophysicist, 1911 Country Brook Lane, Allen, TX 75002, phone: +1-214-544-7183,
fax: +1-214-544-0452, [email protected]
Zero phase is the objective of almost all seismic
data
processing today and its interpretive benefits are well known.
However it is difficult to achieve. No more than 50% of
seismic
data
achieves zero phase sufficiently closely for its benefits
and accuracy to be properly enjoyed. Furthermore 90 degree phase is a remarkably common accident and, if not identified,
can cause havoc to detailed
seismic
interpretation
.
All interpreters should know how to visually assess the phase and polarity of their data
. I regularly meet those who discover
late in the
interpretation
that the
data
has a different phase or opposite polarity to what was first thought. In this paper
recommendations for phase and polarity assessment will be made, and several phase circles will be presented.
For zero phase data
time and amplitude are colocated, and many interpretive procedures on modern workstations are
based on this fact. For other phases complications arise, because time and amplitude are in different locations. Suggestions
will be offered for handling the all-too-common 90 degree phase
data
.