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dc.contributor.authorArlebrand, Berit Angelica
dc.contributor.authorAugustsson, Carita
dc.contributor.authorEscalona, Alejandro
dc.contributor.authorGrundvåg, Sten-Andreas
dc.date.accessioned2021-08-13T10:39:45Z
dc.date.available2021-08-13T10:39:45Z
dc.date.issued2021-07-06
dc.description.abstractThis study examines the role of the depositional environment for the final reservoir quality in four Lower Cretaceous sandstone reservoirs in the southwestern Barents Sea by linking facies to the distribution of primary textures, composition, and diagenetic alteration. Facies analysis reveals slope-to-basin-floor, distal shallow-marine, and deltaic depositional environments. The slope-to-basin-floor sandstone has the highest porosity of 3–19% (avg. 13%). It is attributed to good sorting, non-pervasive carbonate cementation that inhibited compaction and allowed for secondary porosity through later dissolution, and moderate clay infiltration that resulted in clay cutanes on grain rims and the precipitation of chlorite (which inhibited quartz growth). For the deltaic sandstone, moderate to fluctuating energy and sediment supply provided good conditions for mechanical clay infiltration and varying porosity of 2–18% (avg. 8%). The distal shallow-marine sandstone reservoir has the lowest porosity of 1–12% (avg. 7%). Based on its fine-grained and bioturbated character, deposition in a low-energy environment with low sediment supply seems likely. The combination of fine-grained lamina, interstitial matrix and bioturbation led to porosity reduction. Abundant mica and feldspar grains in the shallow-marine sandstone, partly a result of the provenance, and deep burial also resulted in extensive illitization. High mineralogical maturity, much monocrystalline quartz in the quartz-grain populations, and similar felsic chemical rock compositions for all facies associations and wells indicate similar source rocks with some variations. Abundant mechanically unstable mica makes the nearby Loppa High a plausible catchment, which is supported by the seismic geometries. This study demonstrates that the porosity evolution of the studied Lower Cretaceous sandstone reservoirs is determined mainly by the depositional environment despite minor provenance and major diagenetic variationsen_US
dc.identifier.citationArlebrand BA, Augustsson C, Escalona A, Grundvåg S.-A.. Provenance, depositional setting and diagenesis as keys to reservoir quality of the Lower Cretaceous in the SW Barents Sea. Marine and Petroleum Geology. 2021;132en_US
dc.identifier.cristinIDFRIDAID 1923551
dc.identifier.doi10.1016/j.marpetgeo.2021.105217
dc.identifier.issn0264-8172
dc.identifier.issn1873-4073
dc.identifier.urihttps://hdl.handle.net/10037/22043
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalMarine and Petroleum Geology
dc.relation.projectIDNorges forskningsråd: 228107en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/PETROSENTR/228107/Norway/Research Centre for Arctic Petroleum Exploration /ARCEx/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleProvenance, depositional setting and diagenesis as keys to reservoir quality of the Lower Cretaceous in the SW Barents Seaen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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