Downhole Seismic Monitoring at the Geysers

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Description

A 500-ft length, 6-level, 3-component, vertical geophone array was permanently deployed within the upper 800 ft of Unocal's well GDCF 63-29 during a plug and abandonment operation on April 7, 1998. The downhole array remains operational after a period of 1 year, at a temperature of about 150 C. Continuous monitoring and analysis of shallow seismicity (<4000 ft deep) has been conducted over that same 1-year period. The downhole array was supplemented with 4 surface stations in late-1998 and early-1999 to help constrain locations of shallow seismicity. Locations occurring within about 1 km ({approximately}3000 ft) of the array have been ... continued below

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Rutledge, J.T.; Anderson, T.D.; Fairbanks, T.D. & Albright, J.N. October 17, 1999.

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A 500-ft length, 6-level, 3-component, vertical geophone array was permanently deployed within the upper 800 ft of Unocal's well GDCF 63-29 during a plug and abandonment operation on April 7, 1998. The downhole array remains operational after a period of 1 year, at a temperature of about 150 C. Continuous monitoring and analysis of shallow seismicity (<4000 ft deep) has been conducted over that same 1-year period. The downhole array was supplemented with 4 surface stations in late-1998 and early-1999 to help constrain locations of shallow seismicity. Locations occurring within about 1 km ({approximately}3000 ft) of the array have been determined for a subset of high-frequency events detected on the downhole and surface stations for the 10-week period January 6 to March 16, 1999. These events are distinct from surface-monitored seismicity at The Geysers in that they occur predominantly above the producing reservoir, at depths ranging from about 1200 to 4000 ft depth (1450 to -1350 ft elevation). The shallow seismicity shows a northeast striking trend, similar to seismicity trends mapped deeper within the reservoir and the strike of the predominant surface lineament observed over the productive field.

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Medium: P; Size: vp.

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OSTI as DE00761386

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  • 1999 Geothermal Resources Council Annual Meeting, Reno, NV (US), 10/17/1999--10/20/1999

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  • Report No.: LA-UR-99-2194
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 761386
  • Archival Resource Key: ark:/67531/metadc721377

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  • October 17, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 2:23 p.m.

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Rutledge, J.T.; Anderson, T.D.; Fairbanks, T.D. & Albright, J.N. Downhole Seismic Monitoring at the Geysers, article, October 17, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc721377/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.