Rock physics estimation of cement type and impact on the permeability for the Snøhvit Field, the Barents Sea

Sissel Grude, Jack Dvorkin, Martin Landrø

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Laboratory permeability data from a wet sandstone reservoir (the Tubåen formation, Hammerfest Basin, located in the Barents Sea) subject to CO2 sequestration indicates an order of magnitude permeability variation at the same porosity. The velocity and density well data from the well, obtained prior to CO2 injection, show that at the same porosity, the samples with higher permeability have higher elastic moduli (both compressional and shear) as compared to the samples with lower permeability. To understand and quantify this effect, we fit the elastic modulus versus porosity well data with the theoretical constant-cement model theoretical curves. This theoretical rock physics analysis shows that the lower-permeability, softer samples have less contact cement that their high-permeability, stiffer counterparts. One interpretation of this meaning is that in the lower-permeability samples, part of the pore space is filled with fines that do not contribute to the grain-to-grain cementation thus reducing the stiffness (as compared to the well-cemented samples). This means, in turn, that in the softer samples, the fines partly clog the pores thus reducing the permeability. This logic is supported by the geological character of the Tubåen formation where the tidal and marine influence acts to worsen the grain sorting compared to well-sorted distributary channel sediment.

Original languageEnglish
Title of host publicationSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013
Subtitle of host publicationExpanding Geophysical Frontiers
PublisherSociety of Exploration Geophysicists
Pages2670-2674
Number of pages5
ISBN (Print)9781629931883
DOIs
StatePublished - 2013
Externally publishedYes
EventSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013 - Houston, United States
Duration: 22 Sep 201327 Sep 2013

Publication series

NameSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013: Expanding Geophysical Frontiers

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013
Country/TerritoryUnited States
CityHouston
Period22/09/1327/09/13

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