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dc.date.accessioned2016-01-31T14:56:21Z
dc.date.available2016-01-31T14:56:21Z
dc.date.created2015-11-17T11:49:33Z
dc.date.issued2015
dc.identifier.citationKalani, Mohsen Zadeh, Mohammad Koochak Jahren, Jens Mondol, Nazmul Haque Faleide, Jan Inge . Effect of diagenesis on pore pressures in fine-grained rocks in the Egersund Basin, Central North Sea. Norsk Geologisk Tidsskrift. 2015, 95(2), 171-189
dc.identifier.urihttp://hdl.handle.net/10852/48840
dc.description.abstractPore pressure in fine-grained rocks is important with respect to drilling problems such as kicks, blowouts, borehole instability, stuck pipe and lost circulation. In this study, a succession of overpressured, fine-grained, sedimentary rocks located in the Egersund Basin, Central North Sea, was analysed with respect to mineralogical composition, source-rock maturation and log-derived petrophysical properties to highlight the effect of diagenetic processes on the pore pressure. Petrographic and geochemical analyses showed that the overpressure in the study area is largely linked to disequilibrium compaction, illitisation and source-rock maturation shown by log-derived physical properties. Pore-pressure prediction based on the difference of log-derived sonic transit time compared to the normal compaction trend (NCT) of fine-grained rocks can be used to infer the general trends of pore-pressure changes. However, during such pore-pressure prediction (e.g., using Eaton’s approach), one should note that with regard to sonic response of the above-mentioned processes, the sonic log-derived, predicted pore pressure in the chemically compacted intervals and organicrich thermally mature successions may show either underestimations or overestimations, respectively.en_US
dc.languageEN
dc.language.isoenen_US
dc.publisherNorsk geologisk forening
dc.relation.ispartofKalani, Mohsen (2018) Multiscale seal characterization in the North Sea Implications from clay sedimentology, well logs interpretation and seismic analyses. Doctoral thesis http://hdl.handle.net/10852/62039
dc.relation.urihttp://hdl.handle.net/10852/62039
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleEffect of diagenesis on pore pressures in fine-grained rocks in the Egersund Basin, Central North Seaen_US
dc.typeJournal articleen_US
dc.creator.authorKalani, Mohsen
dc.creator.authorZadeh, Mohammad Koochak
dc.creator.authorJahren, Jens
dc.creator.authorMondol, Nazmul Haque
dc.creator.authorFaleide, Jan Inge
cristin.unitcode185,15,22,0
cristin.unitnameInstitutt for geofag
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1289890
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Norsk Geologisk Tidsskrift&rft.volume=95&rft.spage=171&rft.date=2015
dc.identifier.jtitleNorsk Geologisk Tidsskrift
dc.identifier.volume95
dc.identifier.issue2
dc.identifier.startpage171
dc.identifier.endpage189
dc.identifier.doihttp://dx.doi.org/10.17850/njg95-2-03
dc.identifier.urnURN:NBN:no-52683
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0029-196X
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/48840/1/NJG1_Vol95_2_Kalani_Pr.pdf
dc.type.versionPublishedVersion


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