MLchartDataset catalogue

Altered zone

Term · Oil and gas · MLC-T-OAG-000102

A region of rock around a wellbore where the original petrophysical properties have been changed by drilling fluid invasion or other drilling-induced effects. This zone can have different porosity, permeability, and fluid saturation compared to the undisturbed formation. Log measurements taken within this zone require correction to represent the true formation properties.

Table 1. Record
IdentifierMLC-T-OAG-000102
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-000102",
  "term": "Altered zone",
  "field": "Oil and gas",
  "definition": "A region of rock around a wellbore where the original petrophysical properties have been changed by drilling fluid invasion or other drilling-induced effects. This zone can have different porosity, permeability, and fluid saturation compared to the undisturbed formation. Log measurements taken within this zone require correction to represent the true formation properties.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/altered-zone/"
}

Record 119 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.