American Oil and Gas Reporter - November 2015 - 91
FIGURE 6
Pattern Recognition Game Board with Final Parameter Values
of benefit. Once the data were aligned
with the Sw lines, n and BVWirr could
be modified to bring the BVW lines in
alignment with the appropriate "sides"
of the data cloud. Figure 6 displays the
results of modifying these parameters,
with the points in all plots showing alignment with the Sw and BVW lines, and
DANIEL A. KRYGOWSKI is senior
petrophysical adviser at The Discovery
Group in Denver. He has more than
35 years of petrophysical experience,
including designing petrophysical software. He began his career at Cities
Service Company, and subsequently
worked for Atlantic Richfield Company,
Landmark Graphics and Chevron before joining The Discovery Group in
2006. Krygowski holds a B.A. in
physics from the State University of
New York at Geneseo, and an M.S.
and Ph.D. in geophysics with a focus
on petrophysics from the Colorado
School of Mines.
ROBERT M. CLUFF is president of
The Discovery Group. With more than
35 years of experience in geology and
petrophysics, he has conducted projects
in most sedimentary basins of North
America as well as South America, Europe, Southeast Asia and Australia. Before founding the company in 1987,
Cluff was a geologist with the Illinois
State Geological Survey and an independent consulting geologist. He holds
a B.S. in geology from the University
of California at Riverside, an M.S. in
geology from the University of Wisconsin
at Madison, and a B.A. in mathematics
from Metropolitan State College.
with the intercepts specifying RHOma
and Rw.
The order in which the parameters
are changed is up to the interpreter, and
interpreters may find one sequence of
change to be especially efficient. When
actual data are used, and depending on
the range of porosities and saturations,
there may be some ambiguity in the
results, with different sets of parameters
delivering the same fit to the lines and
intercepts to the data. As always, any
other available appropriate data should
be used to arrive at a solution that honors
all available data.
❒
Editor's Note: A spreadsheet of the
game board approach outlined in the preceding article can be downloaded at
http://www.discovery-group.com/resources_petrophysics.htm, along with a
link to more detailed information about
the methodology in a technical paper
presented at the Society of Petrophysicists
& Well Log Analysts' 56th Annual Logging Symposium, held July 18-22 in
Long Beach, Ca.
Coming In December
The Natural Gas White Papers
special reports analyze the state of
the industry heading into the 201516 heating season, and explain why
there may be a silver lining on the intermediate-term horizon for producers. Guest authors also document one
operator's game-changing efficiency
improvements leveraging advanced
automation solutions across its production, gathering and treating operations.
NOVEMBER 2015 91
American Oil and Gas Reporter - November 2015
Table of Contents for the Digital Edition of American Oil and Gas Reporter - November 2015
Contents
American Oil and Gas Reporter - November 2015 - Cover1
American Oil and Gas Reporter - November 2015 - Cover2
American Oil and Gas Reporter - November 2015 - Contents
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