Well Log Techniques

GEOTHERMAL ENERGY

Exploration Technique: Well Log Techniques

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• Areas (4)
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Exploration Technique Information
Exploration Group:	Downhole Techniques
Exploration Sub Group:	Well Log Techniques
Parent Exploration Technique:	Downhole Techniques
Information Provided by Technique
Lithology:	depth and thickness of formations; lithology and porosity can be inferred
Stratigraphic/Structural:	reservoir thickness, reservoir geometry, borehole geometry
Hydrological:	permeability and fluid composition can be inferred
Thermal:	direct temperature measurements; thermal conductivity and heat capacity

Well Log Techniques:

Well logging is the measurement of formation properties versus depth in a borehole.

Other definitions:Wikipedia Reegle

 

Introduction

• "Well logging, also known as wireline logging, is a method of data collection in the borehole environment which enables the determination of subsurface physical properties and reservoir parameters. Measurements are collected versus depth along a well and there are many different types of wireline tools depending on the physical property of interest. In general, well logs respond to variations in rock matrix and pore fluid composition.<br><br> Well logs are acknowledged as legal documents which record the history of a well through the drilling stages and up to its completion. The well logs record physical properties of the borehole which must then be petrophysically interpreted to obtain the associated rock and fluid properties of the well.'"`UNIQ--ref-00000000-QINU`"'<br><br> The standard well logs are the temperature log, the caliper log, and the resistivity log.'"`UNIQ--ref-00000001-QINU`"'" cannot be used as a page name in this wiki.
• The given value was not understood.

Well logging, also known as wireline logging, is a method of data collection in the borehole environment which enables the determination of subsurface physical properties and reservoir parameters. Measurements are collected versus depth along a well and there are many different types of wireline tools depending on the physical property of interest. In general, well logs respond to variations in rock matrix and pore fluid composition.

Well logs are acknowledged as legal documents which record the history of a well through the drilling stages and up to its completion. The well logs record physical properties of the borehole which must then be petrophysically interpreted to obtain the associated rock and fluid properties of the well.

The standard well logs are the temperature log, the caliper log, and the resistivity log.

 

Use in Geothermal Exploration

• "Well logging supports geothermal resource development in the exploration, assessment and exploitation phases of a well.'"`UNIQ--ref-00000002-QINU`"' [[File:WellLogExample.jpg|frame|center|Example of lithology and geophysical logs from a high-temperature well in Iceland.'"`UNIQ--ref-00000003-QINU`"'" cannot be used as a page name in this wiki.
• The given value was not understood.

Well logging supports geothermal resource development in the exploration, assessment and exploitation phases of a well.

Example of lithology and geophysical logs from a high-temperature well in Iceland.

 

Related Techniques

"<br>

• Downhole Techniques
  • Borehole Seismic Techniques
    • Single-Well And Cross-Well Seismic Imaging
    • Vertical Seismic Profiling
  • Formation Testing Techniques
  • Well Log Techniques
    • Acoustic Logs
      • Cement Bond Log
      • Cross-Dipole Acoustic Log
    • Caliper Log
    • Chemical Logging
    • Density Log
    • Gamma Log
    • Image Logs
    • Mud Logging
    • Neutron Log
    • Pressure Temperature Log
    • Single-Well and Cross-Well Resistivity
    • Spontaneous Potential Well Log
  • Well Testing Techniques
    • Downhole Fluid Sampling
    • Earth Tidal Analysis
    • Flow Test
    • Injectivity Test
    • Static Temperature Survey
    • Stress Test
    • Tracer Testing
    • [[Vertical Flowmeter Test|Vertical Flowmeter Test" cannot be used as a page name in this wiki.

Downhole Techniques

• Borehole Seismic Techniques
  • Single-Well And Cross-Well Seismic Imaging
  • Vertical Seismic Profiling
• Formation Testing Techniques
• Well Log Techniques
  • Acoustic Logs
    • Cement Bond Log
    • Cross-Dipole Acoustic Log
  • Caliper Log
  • Chemical Logging
  • Density Log
  • Gamma Log
  • Image Logs
  • Mud Logging
  • Neutron Log
  • Pressure Temperature Log
  • Single-Well and Cross-Well Resistivity
  • Spontaneous Potential Well Log
• Well Testing Techniques
  • Downhole Fluid Sampling
  • Earth Tidal Analysis
  • Flow Test
  • Injectivity Test
  • Static Temperature Survey
  • Stress Test
  • Tracer Testing
  • Vertical Flowmeter Test

 

Potential Pitfalls

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For geothermal well logging, the temperature capabilities of the downhole instruments can be a limiting factor in their application. Geothermal well conditions may require tools rated to 260 degrees Celsius (500 degrees Fahrenheit) or greater.

 

Additional References

http://www.osti.gov/bridge/servlets/purl/5695760/5695760.pdf

The given value was not understood.

 

References

Page	Area	Activity Start Date	Activity End Date	Reference Material
Well Log Techniques At Coso Geothermal Area (1985)	Coso Geothermal Area	1985	1985	Long-Term Testing of Geothermal Wells in the Coso Hot Springs KGRA
Well Log Techniques At Newberry Caldera Area (DOE GTP)	Newberry Caldera Area			GTP ARRA Spreadsheet
Well Log Techniques At Raft River Geothermal Area (1977)	Raft River Geothermal Area	1977	1977	Deep drilling data, Raft River geothermal area, Idaho Raft River geothermal exploration well No. 4
Well Log Techniques At Snake River Plain Region (DOE GTP)	Snake River Plain Geothermal Region			GTP ARRA Spreadsheet

1. Coso Geothermal Area
2. Newberry Caldera Area
3. Raft River Geothermal Area
4. Snake River Plain Geothermal Region

1. Snake River Plain Geothermal Region

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