American Oil and Gas Reporter - September 2015 - 82
FIGURE 1
Principal Component Analysis In-Line Eigenvalue Histograms
A)
B)
Eigen-Spectrum
Eigenvalues
SOM A
First Principal
Component
C)
Eigen-Spectrum
Eigenvalues
SOM B
Second Principal
Component
Results from principal component analysis utilizing 18 instantaneous seismic attributes
are shown here. 1A shows histograms of the highest eigenvalues for in-lines in the seismic
3-D volume, with red histograms representing eigenvalues over the field. 1B shows the
average of eigenvalues over the field (red), with the first principal component in orange
and associated seismic attribute contributions to the right. 1C shows the second principal
component over the field with the seismic attribute contributions to the right. The top five
attributes in 1B were run in SOM A and the top four attributes in 1C were run in SOM B.
attributes will better identify specific geologic features of interest.
Even though the first principal component represents the largest linear attribute
combinations best representing the variability of the bulk of the data, it may not
identify specific features of interest. The
interpreter should evaluate succeeding principal components also because they may
be associated with other important aspects
of the data and geologic features not identified with the first principal component.
In other words, PCA is a tool that,
when employed in an interpretation workflow, can give direction to meaningful
seismic attributes and improve interpretation results. It is logical therefore, that
a PCA evaluation may provide important
information on appropriate seismic attributes to take into generating a self-organizing map.
Self-Organizing Maps
The next level of interpretation requires
pattern recognition and classification of
the often subtle information embedded
in the seismic attributes. Taking advantage
of today's computing technology, visualization techniques and understanding
of appropriate parameters, self-organizing
maps distill multiple seismic attributes
efficiently into classification and proba-
Simpler, high-confidence
prospect decisions
...from clear, comprehensive,
state-of-the-art geophysical
interpretations
Our team of experts comes from your
world. They understand the objectives,
pressures and constraints you face in an
E&P division.
When you work with IGC you can expect
* Candid assessment of tools and analyses.
* Comprehensive analyses you can put to use
immediately.
* The best available data and state-of-the-art tools.
* Concise, well-packaged work product and expert
presentation support.
Get the most comprehensive integrated
seismic/gravity/magnetics tool set by using IGC
as your outsourced analytic team.
Integrated Geophysics Corporation
50 Briar Hollow Lane , Suite 400W
www.igcworld.com
82 THE AMERICAN OIL & GAS REPORTER
Houston, Texas 77027
Tel (713) 680-9996
American Oil and Gas Reporter - September 2015
Table of Contents for the Digital Edition of American Oil and Gas Reporter - September 2015
Contents
American Oil and Gas Reporter - September 2015 - Cover1
American Oil and Gas Reporter - September 2015 - Cover2
American Oil and Gas Reporter - September 2015 - 3
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American Oil and Gas Reporter - September 2015 - Contents
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