The Geysers The Nature, Development and Preservation of a Unique Resource

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The Geysers The Nature, Development and
Preservation of a Unique Resource

• W.T. Box Jr.
• Vice President-Geothermal Resource Management
• Calpine Corporation

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World Geothermal Provinces
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Worlds Largest Geothermal Fields (as of 1/01/01)
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The Big Geysers
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The Geysers Resort
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Structure of Coast Range
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Faulting Northern California
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Heat Flow Anomaly of Geysers-Clearlake Area
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General Geology of the Geysers
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Geologic Cross-Section of the Geysers
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Northwest-Southeast Cross-Section
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Conceptual Model of Geysers Reservoir
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Reservoir Characteristics of Geysers Field
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Geysers Production and Injection History
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Fieldwide Isobaric Map - 2000
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Injection-Production Cycle
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• Typical Geysers Injection Well Completion
• The well is isolated from the cap rock formation
  by multiple strings of cemented steel casing.
• The well is designed to channel water into the
  reservoir at depths of 6,000 to 9,000 ft.

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Injection Areas - Geysers
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• Geysers cumulative production and injection, 1961
  2002
• Throughout most of the fields history steam
  production has been much higher than water
  injection. This created an ever-widening gap
  (mass deficit) between cumulative extraction and
  cumulative injection.
• Even with the additional injection from the SR
  GRP and incremental SR GRP, cumulative injection
  will never replace cumulative production, so the
  tank will never fill up.

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