Pressure-interference testing of the Sumikawa geothermal field

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Pressure interference tests have been used to determine the permeability structure of the Sumikawa reservoir. Interference tests between wells S-4 and KY-1 have indicated the presence of a very high permeability (140 md) north-south channel in the altered andesite layer. Pressure buildup data from well SN-7D have provided indications of a high transmissivity (kh {approx} 18 darcy-meters) reservoir located in the granodiorite layer, lack of pressure response in nearby shutin Sumikawa wells implies that the reservoir penetrated by SN-7D is isolated from the shallower reservoir in the altered andesites. The ''altered andesite'' and the ''granodiorite'' formations constitute the principal geothermal ... continued below

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221-229

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Garg, S.K.; Pritchett, J.W.; Ariki, K. & Kawano, Y. January 1, 1991.

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Description

Pressure interference tests have been used to determine the permeability structure of the Sumikawa reservoir. Interference tests between wells S-4 and KY-1 have indicated the presence of a very high permeability (140 md) north-south channel in the altered andesite layer. Pressure buildup data from well SN-7D have provided indications of a high transmissivity (kh {approx} 18 darcy-meters) reservoir located in the granodiorite layer, lack of pressure response in nearby shutin Sumikawa wells implies that the reservoir penetrated by SN-7D is isolated from the shallower reservoir in the altered andesites. The ''altered andesite'' and the ''granodiorite'' formations constitute the principal geothermal aquifers at Sumikawa. Pressure interference tests (wells KY-1 and SB-2, and wells KY-2 and SB-3) have also confirmed the presence of moderately high transmissivity ({approx} 2 darcy-meters) dacitic layers in the ''marine-volcanic complex'' formation. Because of its low vertical permeability, the ''marine volcanic complex'' formation constitutes an attractive target for the reinjection of waste geothermal fluids.

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221-229

Source

  • Proceedings, sixteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 23-25, 1991

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  • Report No.: SGP-TR-134-28
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888485
  • Archival Resource Key: ark:/67531/metadc873720

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  • January 1, 1991

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 6:10 p.m.

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Garg, S.K.; Pritchett, J.W.; Ariki, K. & Kawano, Y. Pressure-interference testing of the Sumikawa geothermal field, article, January 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc873720/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.