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Rapidly Varying Flow01:24

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A computer program for flow-log analysis of single holes (FLASH).

Frederick D Day-Lewis1, Carole D Johnson, Frederick L Paillet

  • 1US Geological Survey, Office of Groundwater, Branch of Geophysics, 11 Sherman Place, Unit 5015, Storrs, CT 06269, USA. daylewis@usgs.gov

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Summary
This summary is machine-generated.

A new software tool, FLASH, analyzes borehole flow logs to estimate hydraulic properties of fractures and aquifers. This tool aids in understanding groundwater flow in complex geological formations.

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Area of Science:

  • Hydrogeology
  • Environmental Science
  • Geophysics

Background:

  • Borehole flow logging is crucial for characterizing subsurface hydrological properties.
  • Analyzing vertical flow profiles in multilayer systems and fractured rock is complex.
  • Existing methods may lack the integrated analytical approach for diverse geological conditions.

Purpose of the Study:

  • To introduce FLASH (Flow-Log Analysis of Single Holes), a novel computer program for analyzing borehole vertical flow logs.
  • To provide a tool capable of handling both discrete fractures and multilayer aquifers.
  • To enable estimation of key hydrogeological parameters from flow log data.

Main Methods:

  • The program utilizes an analytical solution for steady-state, multilayer radial flow to a borehole.
  • It incorporates specific modules for discrete fractures and multilayer aquifers.
  • FLASH is implemented in Microsoft Excel using Visual Basic for Applications, supporting both manual and automated calibration.

Main Results:

  • FLASH enables the estimation of fracture and layer transmissivities.
  • Far-field hydraulic heads can be determined using the program.
  • The software facilitates analysis under both ambient and stressed (pumping/injection) conditions.

Conclusions:

  • FLASH offers an integrated and versatile approach to analyzing borehole flow logs.
  • The tool enhances the ability to quantify hydrogeological parameters in complex formations.
  • It provides a valuable resource for hydrogeologists and environmental scientists.