Estimation of scattering attenuation in a carbonate reservoir in the Arabian Gulf, Abu Dhabi

Margaret Smoot, Yuefeng Sun, Hamdi Hassan, Mohammed Ali

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

Abstract

Scattering attenuation due to velocity variations occurs as a result of heterogeneity within the layers of the earth. Lithology, porosity, or fluid changes influence the amount of scattering attenuation during wave propagation. We estimate scattering attenuation (Q-1) from Vp logs based on a multiple backscattering (MBS) model and apply Q-1 a means of identifying the structural heterogeneities within the layers of the earth and possibly locating hydrocarbon reservoirs at depth. For the studied Shuaiba formation of the carbonate reservoir, there are three flow units interbedded with two dense layers of carbonates. The average porosity and P-wave velocity of the reservoirs are 18 - 25% and 3.5 - 4.0 km/s, respectively. The velocity variation over the studied reservoir interval is > 50%. The estimated dominant heterogeneity length of the reservoir is about 10 m. Maximum attenuation occurs at the reservoir interval with the quality factor (Q) as low as 10 due to the large velocity contrast in the reservoir interval. These results will be compared with VSP estimates to separate the intrinsic attenuation due to fluid changes from total apparent attenuation in future studies.

Original languageBritish English
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
Pages2802-2805
Number of pages4
ISBN (Print)9781629931883
DOIs
StatePublished - 2013
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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