Background
This exercise focuses on interpreting controlled-source resistivity data by modeling layered earth structures and comparing calculated apparent resistivities against your observations.
Objectives
- Refine the interpretive process through modeling, validation, and sensitivity analysis.
- Connect resistivity survey parameters to the observed data.
- Practice manual inversion where the model is built from the surface downward.
- Identify ambiguity in model parameters and document plausible alternatives.
Schlumberger or Wenner Arrays
Use the JavaScript interpretation app to paste your field data, adjust the layer resistivities and thicknesses, and compare the observed curve with the modeled response.
Procedure
- Generate or locate your resistivity data set. It should contain electrode spacing and apparent resistivity columns.
- Paste each sounding into the JavaScript modeling app and submit the data.
- Adjust layer thicknesses and resistivities until the modeled response fits the observed curve.
- Vary model parameters around your preferred model to estimate uncertainty and ambiguity.
Outcomes
The final report should summarize the survey design, interpretation procedure, preferred model, uncertainty, and any geologically plausible alternatives.