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Overburden pore-pressure changes and their influence on 4D seismic

Holt, Rune Martin; Bauer, Andreas Kurt Marcel; Bakk, Audun
Journal article, Peer reviewed
Accepted version
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SEG-Abstract_2017_for-CRISTIN.pdf (300.0Kb)
URI
http://hdl.handle.net/11250/2469535
Date
2017
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  • Institutt for geovitenskap og petroleum [2176]
  • Publikasjoner fra CRIStin - NTNU [26671]
Original version
SEG technical program expanded abstracts. 2017, 3632-3636.   10.1190/segam2017-17727948.1
Abstract
Changes in seismic two-way travel time in the overburden can be attributed to pore pressure changes in the underlying reservoir. Since cap rock permeability is very small, these stress changes occur without drainage on short term, which means that, depending on stress path, pore pressure may also change in the overburden. The direct impact of this on 4D seismic has not been thoroughly addressed in the literature. Here, laboratory data with an overburden shale core are presented, showing stress path dependent changes in P-wave velocity and pore pressure. The expected impact on 4D seismic can be significant.
Publisher
Society of Exploration Geophysicists
Journal
SEG technical program expanded abstracts

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