Logging

{
  "id": "MLC-T-OAG-004376",
  "term": "Logging",
  "field": "Oil and gas",
  "definition": "The process of recording physical properties of rock formations versus depth, either as a well is being drilled or after it has reached a certain depth. This is accomplished by lowering specialized sensor tools, known as sondes, into the borehole on an electric wireline or as part of the drill string. The resulting record, a well log, provides data on properties like resistivity, density, and porosity.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/logging/"
}