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U.S. Department of Energy Geothermal Technologies Program Exploration Peer Review Report

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Title: U.S. Department of Energy Geothermal Technologies Program Exploration Peer Review Report


1
U.S. Department of EnergyGeothermal Technologies
ProgramExploration Peer Review Report
Project Title Assembling Crustal Geophysical
Data for Geothermal Exploration in the Great
Basin CPS Identifier 12339 Principal
Investigator John N. Louie Sponsoring
Organization University of Nevada,
Reno www.seismo.unr.edu/geothermal
2
Project Purpose
  • Assemble 3-d reference model of seismic velocity
    for the western Great Basin
  • Understand deep heat sources
  • Can crustal thickness be a resource indicator?
  • Improve regional models of resource geology
  • Assist USGS national geothermal assessment

3
Regional Geothermal Assessment
1990 Geophysical Framework grids
Poor Detail in No. Nevada
4
Geothermal Index from crustal properties of 1990
Diamond size from kilowatts produced
5
Lack of Post-60s Refraction Coverage
6
Project Objectives
  • 3-d reference model of seismic velocity for the
    western Great Basin
  • Contribute critical data toward the effective
    exploration for new geothermal resources
  • Fill in poorly characterized areas
  • Develop a community model contributed to regional
    assessment activities
  • Evaluate geophysical indicators of geothermal
    resources
  • Build academic infrastructure and technical
    workforce in geothermal science and technology

7
Funding
Fiscal Year DOE Funding (k) Cost Share (k) Total
02 144,584 0 144,584
03 74,833 0 74,833
04 83,251 15,221 98,472
05 38,613 7,723 46,336
06 42,598 8,520 51,118
DOE funding to the University of Nevada, Reno has
been delayed approximately one year for this
project. FY 05 funding has not yet been received.
8
Plans and Approach
  • Five Tasks
  • Compile existing crustal information
  • Establish a facility for long-range crustal
    surveys
  • Develop new regional seismic-refraction
    technology
  • Collect three new crustal refraction profiles
  • Integrate new and prior results create a
    regional crustal model make model available to
    others

9
Selected Milestones
10
Results 1.
  1. Compile existing crustal information
  2. Establish a facility for long-range crustal
    surveys
  3. Develop new regional seismic-refraction
    technology
  4. Collect three new crustal refraction profiles
  5. Integrate new and prior results create a
    regional crustal model make model available to
    others

11
Complete Compilation of GB Crustal Thicknesses
12
Results 2.
  1. Compile existing crustal information
  2. Establish a facility for long-range crustal
    surveys
  3. Develop new regional seismic-refraction
    technology
  4. Collect three new crustal refraction profiles
  5. Integrate new and prior results create a
    regional crustal model make model available to
    others

13
21 Texans from Refraction Technology, Inc.
14
Results 3.
  1. Compile existing crustal information
  2. Establish a facility for long-range crustal
    surveys
  3. Develop new regional seismic-refraction
    technology
  4. Collect three new crustal refraction profiles
  5. Integrate new and prior results create a
    regional crustal model make model available to
    others

15
Anatomy of a Nevada Gold MineDaily seismic
sources of opportunity
16
200 Texans from PASSCAL and DOE/GBCGE
17
The N. Walker Lane Experiment, 2002
18
Data Synthetics Reduced by 7.4 km/s
19
May 21 M1.6 Earthquake Near Bridgeport
Small 1st arrival clear at 100s of km
20
Results 4.
  1. Compile existing crustal information
  2. Establish a facility for long-range crustal
    surveys
  3. Develop new regional seismic-refraction
    technology
  4. Collect three new crustal refraction profiles
  5. Integrate new and prior results create a
    regional crustal model make model available to
    others

21
The N. Walker Lane Experiment, 2002
22
How Thick is the Crust?
Journal Publication Louie, J. N., W. Thelen, S.
B. Smith, J. B. Scott, M. Clark, and S.
Pullammanappallil, 2004, The northern Walker Lane
refraction experiment Pn arrivals and the
northern Sierra Nevada root Tectonophysics, 388,
253-269.
23
Idaho-Nevada-California (INC), 2004
24
400 Texans from PASSCAL and DOE/GBCGE
25
Aug. 2004 INC Recording
26
Aug. 2004 INC Recording - 500-km distances
27
Spanning the Region
28
Results 5.
  1. Compile existing crustal information
  2. Establish a facility for long-range crustal
    surveys
  3. Develop new regional seismic-refraction
    technology
  4. Collect three new crustal refraction profiles
  5. Integrate new and prior results create a
    regional crustal model make model available to
    others

29
Considering New Crustal Thicknesses- M. Coolbaugh
30
Compilation of Selected Crustal Thicknesses
31
Impact of Work/Merit
  • New technology for national/regional assessments
  • Progress toward improving success rate for
    finding resources at undrilled sites to 40
  • Thin crust helps locate Buffalo Valley prospect
  • Technology transfer
  • Websites, Journal paper, 2 GRC papers, SEG paper,
    International conference, 7 other US workshops
  • Collaborators IRIS/PASSCAL, Optim Inc., LLNL,
    GBCGE
  • Workforce development
  • 20 student field hands, 8 student co-authors,
    senior thesis, 2 MS theses, PhD thesis

32
Plans for Completion
  • Final 2 project years have reduced funds
  • Publish INC results
  • Collect Utah transect 8/05, report results,
    publish
  • Integrate new results into Great Basin model
  • Gather industry feedback on regional model
  • Publish and deliver model to collaborators and
    groups doing regional assessment
  • Heimgartner graduates with MS degree by 9/07
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