Evaluation of fluid flow in enhanced geothermal reservoirs based on induced microseismic multiplets

Hirokazu Moriya, Hiroaki Niitsuma, Roy Baria

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The relationship between induced microseismic multiplets and fluid injection during hydraulic stimulation of geothermal reservoirs is a possible technique for monitoring fluid flow in fractures and identifying major fluid flow paths in reservoirs. We have identified induced microseismic multiplets in a reservoir zone where preexisting fractures were enhanced by fluid injection to be major fluid flow paths. Analysis of the time intervals of microseismic events shows that the occurrence of multiplet events is quasi-periodic rather than random and is inferred to be related to fluid flow rate in fractures. Our analysis shows that the energy of multiplet events per unit volume of injected fluid and time tends to be larger at the fractures near the outlet zone, where fluid flow rates in fracture are expected to be higher. We derived and evaluated a parameter comprising the event energy, injection fluid volume, and timing of multiplet occurrence that shows promise as an indication of fluid flow rate in fractures.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
Pages371-374
Number of pages4
Publication statusPublished - 2010 Dec 1
EventGeothermal Resources Council Annual Meeting 2010, Geothermal 2010 - Sacramento, CA, United States
Duration: 2010 Oct 242010 Oct 27

Publication series

NameTransactions - Geothermal Resources Council
Volume34 1
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
CountryUnited States
CitySacramento, CA
Period10/10/2410/10/27

Keywords

  • Acoustic emission
  • EGS
  • Microseismicity
  • Multiplet

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

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