BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1616
DTSTART:20090924T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260417T151545Z
LAST-MODIFIED:20090908T134006Z
LOCATION:2103 Chamberlin (tentative) (coffee & cookies at 3:30)
SUMMARY:Time-lapse seismic monitoring of reservoir deformation\, NPAC 
 (Nuclear/Particle/Astro/Cosmo) Forum\, Paul Hatchell\, Shell Internati
 onal E&P\, Research and Development\, Houston\, TX
DESCRIPTION:Seismic imaging is a technology used worldwide by the oil 
 industry to look into the subsurface and determine underground structu
 res and their potential for oil and gas production. Time-lapse seismic
  monitoring is a relatively new technology that consists of carefully 
 repeating a seismic image months to years after production starts and 
 looking for changes that indicate where production did or did not occu
 r to help guide future operations. <br><br>
\n<br><br>
\nProduction of
  oil and gas is often accompanied by a large reduction in the reservoi
 r fluid pressure that in some cases leads to compaction as large as se
 veral meters. The deformation of the reservoir layers is coupled to th
 e adjacent rocks and leads to changes in the stress and strain fields 
 that extend a great distance away from the reservoir. Time-lapse seism
 ic measurements through these rocks show large variations that are use
 ful for monitoring the distribution of deformation within the reservoi
 r.<br><br>
\n<br><br>
\nThe compaction induces seismic velocity change
 s that are observed on many different wave types including conventiona
 l P-P reflection seismic\, P-S mode converted seismic\, and surface wa
 ves such as the Scholte wave and refracted compressional waves. Using 
 geomechanical models that predict changes in stress and strain fields 
 within the earth we can start to understand the factors that control t
 he changes in seismic velocities. We find that simple non-linear relat
 ionships between velocity and strain produce forward models that match
  many of our observations. <br><br>
\n<br><br>
\n
URL:https://www.physics.wisc.edu/events/?id=1616
END:VEVENT
END:VCALENDAR