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dc.contributor.authorBakk, Audun
dc.contributor.authorHolt, Rune Martin
dc.contributor.authorBauer, Andreas
dc.contributor.authorDupuy, Bastien
dc.contributor.authorRomdhane, Mohamed Anouar
dc.date.accessioned2020-08-25T11:11:48Z
dc.date.available2020-08-25T11:11:48Z
dc.date.created2019-08-23T11:21:44Z
dc.date.issued2019
dc.identifier.isbn978-94-6282-289-4
dc.identifier.urihttps://hdl.handle.net/11250/2673905
dc.description.abstractDepletion or injection into a reservoir implies stress and strain changes in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. We have measured multidirectional ultrasonic P-wave velocity changes for three different field shale cores, each probed with four different stress paths (i.e. different ratios between the horizontal and the vertical stress change), to systematically quantify the time-shifts for overburden shales with respect to ray angle (offset). The laboratory data show that for a given offset, the time-shifts are stress path dependent, where the isotropic stress path is associated with larger time-shifts as compared to the constant mean stress path or the triaxial stress path. Generally, the time-shifts are largest for zero offset (propagation normal to the bedding) and are decreasing for increasing offsets. The constant mean stress path has the most significant decrease of time-shifts with offset. By utilizing pre-stack seismic offset data, such controlled laboratory experiments can be used to constrain the inversion of 4D seismic data to quantify the stress and strain changes due to production. This may have important implications for improved recovery and safety, particularly in mature fields.en_US
dc.language.isoengen_US
dc.publisherEuropean Association of Geoscientists & Engineersen_US
dc.relation.ispartof81th EAGE Annual Conference & Exhibition 2019
dc.relation.urihttp://earthdoc.eage.org/publication/publicationdetails/?publication=97463
dc.titleOffset-Dependent Overburden Time-Shifts from Ultrasonic Dataen_US
dc.typeChapteren_US
dc.description.versionacceptedVersionen_US
dc.identifier.doi10.3997/2214-4609.201900804
dc.identifier.cristin1718238
dc.relation.projectNorges forskningsråd: 234074en_US
dc.description.localcode© EAGE Publications BV. https://doi.org/10.3997/2214-4609.201900804en_US
cristin.unitcode194,64,90,0
cristin.unitnameInstitutt for geovitenskap og petroleum
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1


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