Characteristics of Microseismicity in the DV11 Injection Area, Southeast Geysers, California

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Microearthquake (MEQ) occurrence surrounding the injection well DV11 in Unit 18 of the Southeast (SE) Geysers is investigated. Seismicity rates are compared to the injection rate, and to flow rates in nearby steam extraction wells, which were monitored during the Unit 18 Cooperative Injection Test in 1994 and 1995. The seismicity rate is seen to mirror both injection and production rates, although a time lag sometimes occurs. Waveform cross-correlation is performed for the MEQs in the DV11 area, and the events grouped into clusters based on waveform similarity. Relative location techniques applied to the events in two of these clusters ... continued below

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7 pages

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Kirkpatrick, Ann; Peterson Jr., John E.; Majer, Ernest L. & Nadeau, Robe rt November 1, 1998.

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Description

Microearthquake (MEQ) occurrence surrounding the injection well DV11 in Unit 18 of the Southeast (SE) Geysers is investigated. Seismicity rates are compared to the injection rate, and to flow rates in nearby steam extraction wells, which were monitored during the Unit 18 Cooperative Injection Test in 1994 and 1995. The seismicity rate is seen to mirror both injection and production rates, although a time lag sometimes occurs. Waveform cross-correlation is performed for the MEQs in the DV11 area, and the events grouped into clusters based on waveform similarity. Relative location techniques applied to the events in two of these clusters show 7 events grouped into a volume of about 25 m in diameter, at an elevation of about -0.65 km msl and 5 events grouped into a vertically-oriented linear feature about 100 m in length, at about -1.8 km msl.

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7 pages

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OSTI as DE00838055

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  • Twenty-Fourth Workshop Geothermal Reservoir Engineering, Stanford, CA (US), 01/25/1999--01/27/1999

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  • Report No.: LBNL--43098
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 838055
  • Archival Resource Key: ark:/67531/metadc780312

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  • November 1, 1998

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 4 p.m.

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Kirkpatrick, Ann; Peterson Jr., John E.; Majer, Ernest L. & Nadeau, Robe rt. Characteristics of Microseismicity in the DV11 Injection Area, Southeast Geysers, California, article, November 1, 1998; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc780312/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.