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TitreTime-lapse seismic performance of a sparse permanent array: experience from the Aquistore CO2 storage site
AuteurWhite, D J; Roach, L A N; Roberts, B
SourceGeophysics vol. 80, no. 2, 2015 p. WA35-WA48, https://doi.org/10.1190/geo2014-0239.1
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140198
ÉditeurSociety of Exploration Geophysicists
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1190/geo2014-0239.1
Mediapapier; en ligne; numérique
Formatshtml; pdf
ProvinceSaskatchewan
SNRC62E/03
Lat/Long OENS-103.1000 -103.0333 49.1333 49.0333
Sujetsméthodes analytiques; levés sismiques; pipelines; établissement de modèles; géophysique
ProgrammeSaisi et entreposage de carbone, Géosciences environnementales
Résumé(disponible en anglais seulement)
A sparse areal permanent array of buried geophones was deployed at the Aquistore CO2 storage site in Saskatchewan, Canada. The purpose of this array is to facilitate 4D seismic monitoring of CO2 that is to be injected to the deep subsurface. Use of a sparse buried array is designed to improve the repeatability of time-lapse data and to economize the monitoring effort. Prior to the start of CO2 injection, two 3D dynamite seismic surveys were acquired in March 2012 and May 2013 using the permanent array. The objective of acquiring these data was to allow an assessment of the data repeatability and overall performance of the permanent array. A comparison of the raw data from these surveys and with a conventional high-resolution 3D vibroseis survey demonstrated that (1) the signal-to-noise ratio for the buried geophones was increased by 6--7 dB relative to surface-deployed geophones and by an additional 20 dB for dynamite relative to a vibroseis source, (2) the use of buried sensors and sources at this site did not appear to be significantly degraded by the effects of ghosting, (3) repeatability for the permanent array data was excellent with a mean normalized rootmean-square (nrms) value of 57% for the raw baseline-monitor difference, (4) the variance of nrms values was higher for shot gathers (18%) compared with receiver gathers (7%), and (5) the raw data repeatability was a factor of three improved over that of comparable surface-geophone data acquired at a nearby location. The use of a sparse buried permanent array at the Aquistore site has demonstrably achieved a reduction in ambient noise levels and overall enhanced data repeatability, both of which are keys to successful 4D seismic monitoring.
Résumé(Résumé en langage clair et simple, non publié)
Cette étude démontre la faisabilité technique de l'utilisation d'un nombre restreint de capteurs sismiques pour la surveillance des sites de stockage du carbonne. Cela a le potentiel de réduire sensiblement les coûts de surveillance sismique et contribuer ainsi au déploiement de la technologie CSC.
GEOSCAN ID295154