Time-lapse crosswell seismic and VSP monitoring of injected CO2 ina brine aquifer

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Seismic surveys successfully imaged a small scale C02injection (1,600 tons) conducted in a brine aquifer of the Frio Formationnear Houston, Texas. These time-lapse bore-hole seismic surveys,crosswell and vertical seismic profile (VSP), were acquired to monitorthe C02 distribution using two boreholes (the new injection well and apre-existing well used for monitoring) which are 30 m apart at a depth of1500 m. The crosswell survey provided a high-resolution image of the C02distribution between the wells via tomographic imaging of the P-wavevelocity decrease (up to 500 mls). The simultaneously acquired S-wavetomography showed little change in S-wave velocity, as expected for fluidsubstitution. A rock ... continued below

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Daley, Thomas M.; Myer, Larry R.; Peterson, J.E.; Majer, E.L. & Hoversten,G.M. May 30, 2006.

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Seismic surveys successfully imaged a small scale C02injection (1,600 tons) conducted in a brine aquifer of the Frio Formationnear Houston, Texas. These time-lapse bore-hole seismic surveys,crosswell and vertical seismic profile (VSP), were acquired to monitorthe C02 distribution using two boreholes (the new injection well and apre-existing well used for monitoring) which are 30 m apart at a depth of1500 m. The crosswell survey provided a high-resolution image of the C02distribution between the wells via tomographic imaging of the P-wavevelocity decrease (up to 500 mls). The simultaneously acquired S-wavetomography showed little change in S-wave velocity, as expected for fluidsubstitution. A rock physics model was used to estimate C02 saturationsof 10-20 percent from the P-wave velocity change. The VSP survey resolveda large (-70 percent) change in reflection amplitude for the Friohorizon. This C02 induced reflection amplitude change allowed estimationof the C02 extent beyond the monitor well and on 3 azimuths. The VSPresult is compared with numerical modeling of C02 saturations and isseismically modeled using the velocity change estimated in the crosswellsurvey.

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  • Journal Name: Environmental Geology; Journal Volume: 0; Related Information: Journal Publication Date: 07/26/2007

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  • Report No.: LBNL--62396
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 913163
  • Archival Resource Key: ark:/67531/metadc886862

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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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  • May 30, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 7:14 p.m.

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Daley, Thomas M.; Myer, Larry R.; Peterson, J.E.; Majer, E.L. & Hoversten,G.M. Time-lapse crosswell seismic and VSP monitoring of injected CO2 ina brine aquifer, article, May 30, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc886862/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.