Permeability, electrical impedance, and acoustic velocities on reservoir rocks from the Geysers geothermal field

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Description

Previous measurements of acoustic velocities on NEGU- 17 cores indicate that saturation effects are significant enough to cause V<sub>p</sub>/V<sub>s</sub> anomalies observed in the field. In this study we report on the results of new measurements on core recently recovered from SB-15-D along with some additional measurements on the NEGU-17 cores. The measurements indicate correlations between mechanical, transport, and water storage properties of the matrix which may prove useful for reservoir assessment and management. The SB-15-D material is found to be similar to the NEGU-17 material in terms of acoustic velocities, being characterized by a notably weak pressure dependence on the ... continued below

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343-350

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Boitnott, G.N. & Boyd, P.J. January 24, 1996.

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Description

Previous measurements of acoustic velocities on NEGU- 17 cores indicate that saturation effects are significant enough to cause V<sub>p</sub>/V<sub>s</sub> anomalies observed in the field. In this study we report on the results of new measurements on core recently recovered from SB-15-D along with some additional measurements on the NEGU-17 cores. The measurements indicate correlations between mechanical, transport, and water storage properties of the matrix which may prove useful for reservoir assessment and management. The SB-15-D material is found to be similar to the NEGU-17 material in terms of acoustic velocities, being characterized by a notably weak pressure dependence on the velocities and a modest V<sub>p</sub>/V<sub>s</sub> signature of saturation. The effect of saturation on V<sub>p</sub>/V<sub>s</sub> appears to result in part from a chemo-mechanical weakening of the shear modulus due to the presence of water. Electrical properties of SB-15-D material are qualitatively similar to those of the NEGU-17 cores, although resistivities of SB-15-D cores are notably lower and dielectric permittivities higher than in their NEGU- 17 counterparts. While some limited correlations of measured properties with depth are noted, no clear change in character is observed within SB-15-D cores which can be associated with the proposed cap-rock/reservoir boundary.

Physical Description

343-350

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  • Proceedings, Twenty-First Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, January 22-24, 1996

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  • Report No.: SGP-TR-151-48
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 889843
  • Archival Resource Key: ark:/67531/metadc884779

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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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  • January 24, 1996

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 4:23 p.m.

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Boitnott, G.N. & Boyd, P.J. Permeability, electrical impedance, and acoustic velocities on reservoir rocks from the Geysers geothermal field, article, January 24, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc884779/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.