Imaging of CO{sub 2} injection during an enhanced-oil-recovery experiment

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A series of time-lapse seismic cross well and single well experiments were conducted in a diatomite reservoir to monitor the injection of CO{sub 2} into a hydrofracture zone, using P- and S-wave data. During the first phase the set of seismic experiments were conducted after the injection of water into the hydrofrac-zone. The set of seismic experiments was repeated after a time period of 7 months during which CO{sub 2} was injected into the hydrofractured zone. The issues to be addressed ranged from the detectability of the geologic structure in the diatomic reservoir to the detectability of CO{sub 2} within ... continued below

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12 pages

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Gritto, Roland; Daley, Thomas M. & Myer, Larry R. April 29, 2003.

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A series of time-lapse seismic cross well and single well experiments were conducted in a diatomite reservoir to monitor the injection of CO{sub 2} into a hydrofracture zone, using P- and S-wave data. During the first phase the set of seismic experiments were conducted after the injection of water into the hydrofrac-zone. The set of seismic experiments was repeated after a time period of 7 months during which CO{sub 2} was injected into the hydrofractured zone. The issues to be addressed ranged from the detectability of the geologic structure in the diatomic reservoir to the detectability of CO{sub 2} within the hydrofracture. During the pre-injection experiment, the P-wave velocities exhibited relatively low values between 1700-1900 m/s, which decreased to 1600-1800 m/s during the post-injection phase (-5 percent). The analysis of the pre-injection S-wave data revealed slow S-wave velocities between 600-800 m/s, while the post-injection data revealed velocities between 500-700 m/s (-6 percent). These velocity estimates produced high Poisson ratios between 0.36 and 0.46 for this highly porous ({approx} 50 percent) material. Differencing post- and pre-injection data revealed an increase in Poisson ratio of up to 5 percent. Both, velocity and Poisson estimates indicate the dissolution of CO{sub 2} in the liquid phase of the reservoir accompanied by a pore-pressure increase. The results of the cross well experiments were corroborated by single well data and laboratory measurements on core data.

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12 pages

Notes

OSTI as DE00816368

Source

  • Underground Injection Science and Technology Symposium, Berkeley, CA (US), 10/22/2003--10/25/2003

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  • Report No.: LBNL--52626
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 816368
  • Archival Resource Key: ark:/67531/metadc737116

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 29, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 1:11 p.m.

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Gritto, Roland; Daley, Thomas M. & Myer, Larry R. Imaging of CO{sub 2} injection during an enhanced-oil-recovery experiment, article, April 29, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc737116/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.