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How can seismic
attributes aid the geophysicist in making accurate
interpretations?
Presented by Satinder
Chopra
March 18th or
March 20th, 2008
11:55 to 1 pm (lunch provided)
Suite 2600, 111 - 5th Ave
SW
East Petro-Canada Tower
Limited seating,
click here to
RSVP
This
is the third in a series of lunch & learn seminars, see
the sidebar for information on the other topics.
Seismic attributes extract
information from seismic reflection data that can be
used for both quantitative and qualitative
interpretation. Some attributes such as seismic
amplitude, envelope, RMS amplitude, spectral magnitude,
acoustic impedance, elastic impedance, and AVO measures
are directly sensitive to changes in seismic impedance.
Other attributes such as peak-to-trough thickness, peak
frequency, and bandwidth are sensitive to layer
thicknesses. Both of these classes of attributes can be
quantitatively correlated to well control using
multivariate analysis, geostatistics, or neural
networks. Seismic attributes such as coherence, Sobel
filter edge detectors, amplitude gradients, dip-azimuth,
curvature, and gray-level co-occurrence matrix texture
attributes provide images that allow interpreters to
qualitatively use geologic models of structural
deformation, seismic stratigraphy, and seismic
geomorphology, to infer the presence of fractures or the
likelihood of encountering sand-prone facies.
It is therefore no
surprise that research workers at major oil companies,
geoscience contractors and universities continue not
only to develop new seismic attributes and improve
workflows using well-established attributes but also to
minimize seismic artifacts and calibrate the attribute
expression of geologic features that were previously
unrecognized or overlooked. Attribute computation on
seismic data is an art. There are many ways to bring out
the features of interest in 3D seismic data volumes,
some subtle and some prominent. Apart from the choice of
the computation parameters, the input data needs to be
conditioned, and the choice of algorithms make a
significant difference to the quality of the results.
Some of these ways will be discussed in the
presentation.
Examples will be presented
for the application of curvature and coherence
attributes to 3D seismic volumes to show how these
attributes can aid the geophysicist in making more
accurate interpretations. A final goal in this talk on
seismic attributes is to update readers on the emerging
trends and also talk about the directions in which
seismic attributes are headed.
To learn more, attend the
lunch & learn session on March 18th or 20th.
Click here to RSVP.
This course is
available as a free in-house seminar. For more
information contact Florence Janzen, 781-1437 or email
fjanzen@arcis.com. |
