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Title: A Sea Floor Gravity Survey of the Sleipner Field to Monitor CO2 Migration

Abstract

Since 1996, excess CO{sub 2} from the Sleipner natural gas field has been sequestered and injected underground into a porous saline aquifer 1000 m below the seafloor. In 2002, we carried out a high precision micro-gravity survey on the seafloor in order to monitor the injected CO{sub 2}. A repeatability of 4.3 {micro}Gal in the station averages was observed. This is considerably better than pre-survey expectations. These data will serve as the baseline for time-lapse gravity monitoring of the Sleipner CO{sub 2} injection site. This report covers 3/19/05 to 9/18/05. During this time, gravity and pressure modeling were completed and graduate student Scott Nooner finished his Ph.D. dissertation, of which this work is a major part. Three new ROVDOG (Remotely Operated Vehicle deployable Deep Ocean Gravimeter) instruments were also completed with funding from Statoil. The primary changes are increased instrument precision and increased data sampling rate. A second gravity survey was carried out from August to September of 2005, allowing us to begin examining the time-lapse gravity changes caused by the injection of CO{sub 2} into the underground aquifer, known as the Utsira formation. Preliminary processing indicates a repeatability of 3.6 {micro}Gal, comparable to the baseline survey.

Authors:
;
Publication Date:
Research Org.:
Scripps Institution of Oceanography
Sponsoring Org.:
USDOE
OSTI Identifier:
861645
DOE Contract Number:  
FC26-02NT41587
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; ACCURACY; AQUIFERS; FLOORS; GRAVITY SURVEYS; MONITORING; MONITORS; NATURAL GAS FIELDS; PROCESSING; PROGRESS REPORT; SAMPLING; SEAS; SIMULATION

Citation Formats

Mark Zumberge, and Scott Nooner. A Sea Floor Gravity Survey of the Sleipner Field to Monitor CO2 Migration. United States: N. p., 2005. Web. doi:10.2172/861645.
Mark Zumberge, & Scott Nooner. A Sea Floor Gravity Survey of the Sleipner Field to Monitor CO2 Migration. United States. doi:10.2172/861645.
Mark Zumberge, and Scott Nooner. Tue . "A Sea Floor Gravity Survey of the Sleipner Field to Monitor CO2 Migration". United States. doi:10.2172/861645. https://www.osti.gov/servlets/purl/861645.
@article{osti_861645,
title = {A Sea Floor Gravity Survey of the Sleipner Field to Monitor CO2 Migration},
author = {Mark Zumberge and Scott Nooner},
abstractNote = {Since 1996, excess CO{sub 2} from the Sleipner natural gas field has been sequestered and injected underground into a porous saline aquifer 1000 m below the seafloor. In 2002, we carried out a high precision micro-gravity survey on the seafloor in order to monitor the injected CO{sub 2}. A repeatability of 4.3 {micro}Gal in the station averages was observed. This is considerably better than pre-survey expectations. These data will serve as the baseline for time-lapse gravity monitoring of the Sleipner CO{sub 2} injection site. This report covers 3/19/05 to 9/18/05. During this time, gravity and pressure modeling were completed and graduate student Scott Nooner finished his Ph.D. dissertation, of which this work is a major part. Three new ROVDOG (Remotely Operated Vehicle deployable Deep Ocean Gravimeter) instruments were also completed with funding from Statoil. The primary changes are increased instrument precision and increased data sampling rate. A second gravity survey was carried out from August to September of 2005, allowing us to begin examining the time-lapse gravity changes caused by the injection of CO{sub 2} into the underground aquifer, known as the Utsira formation. Preliminary processing indicates a repeatability of 3.6 {micro}Gal, comparable to the baseline survey.},
doi = {10.2172/861645},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 13 00:00:00 EST 2005},
month = {Tue Dec 13 00:00:00 EST 2005}
}

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