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Time-lapse seismic performance of a sparse permanent array; experience from the Aquistore CO (sub 2) storage site

Don J. White, Lisa A. N. Roach and Brian Roberts
Time-lapse seismic performance of a sparse permanent array; experience from the Aquistore CO (sub 2) storage site
Geophysics (March 2015) 80 (2): WA35-WA48

Abstract

A sparse areal permanent array of buried geophones was deployed at the Aquistore CO (sub 2) storage site in Saskatchewan, Canada. The purpose of this array is to facilitate 4D seismic monitoring of CO (sub 2) 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 CO (sub 2) 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 root-mean-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.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 80
Serial Issue: 2
Title: Time-lapse seismic performance of a sparse permanent array; experience from the Aquistore CO (sub 2) storage site
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Pages: WA35-WA48
Published: 201503
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 20
Accession Number: 2015-051985
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N49°00'00" - N49°19'60", W103°04'60" - W102°55'00"
Secondary Affiliation: University of Leeds, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201524
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