American Oil and Gas Reporter - November 2015 - 133

said it had a fault map, but most of it
showed shallow faults in the sedimentary
section, because that was where most of
the research had been done."
Oklahoma's oil and gas companies
volunteered to provide seismic data to
OGS to fill in those gaps, Hatfield says.
Firms typically treat that information as
proprietary, but he says they saw the
harm to all companies if the public concluded the industry as a whole was responsible for induced seismic events.
"A number of companies provided
their best fault traces in the basement to
the Geologic Survey. It compiled that information, but did not identify which
company was the source for which fault
data, so that nobody could gain a competitive advantage," Hatfield relates. "This
was just an instance where you had three
people with pieces of the puzzle, but nobody could do what they needed to do
without cooperation from the other two."
OIPA also is involved in collecting
information on the rock properties that
guide interpreting the seismic data, he
adds. Locating the hypocenter of earthquake events depends on measuring how
fast seismic waves move through formations. Hatfield reports those waves travel
at different speeds, which depend on the
rocks involved-fastest in limestone and
slowest in shales. He points out the U.S.
Geological Survey evaluates its seismic
interpretations using a national velocity
profile based on rock conditions from
California and the West Coast.
"In Oklahoma, the rocks are older and
more competent. If you use the correct
velocity profile, it shows these events
are occurring deeper than what a slower
profile would show," he details. "Being
able to accurately position and pinpoint
these events depends on having the best
knowledge possible of the .velocity in
the formation. OIPA members have provided a number of check shots from their
seismic research to USGS, to allow the
agency to fine tune its calculations and
make them more accurate."
At the request of OGS staff members,
OIPA also is conducting research on
monitoring formation pressures in the
Arbuckle, he reports.
"The association has provided a forum
where everyone can talk about what is
needed and what problems need to be
solved. It has been a very collaborative
effort, which infuriates some people to no
end because they say this should be an
adversarial process," Hatfield says. "I
don't adhere to that. OCC would agree
that it has been able to get much more accomplished with the industry and survey
working with it, than if we were all over
in our separate corners shooting at each
other."
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NOVEMBER 2015 133



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
American Oil and Gas Reporter - November 2015 - 4
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American Oil and Gas Reporter - November 2015 - Cover3
American Oil and Gas Reporter - November 2015 - Cover4
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