MLchartDataset catalogue

Sigma

Term · Oil and gas · MLC-T-OAG-003404

The macroscopic thermal neutron capture cross-section of a formation, representing its ability to absorb thermal neutrons. It is measured in capture units (cu) or sigma units and is primarily influenced by the presence of chlorine in formation water. A higher sigma value generally indicates increased water saturation in the reservoir rock.

Table 1. Record
IdentifierMLC-T-OAG-003404
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-003404",
  "term": "Sigma",
  "field": "Oil and gas",
  "definition": "The macroscopic thermal neutron capture cross-section of a formation, representing its ability to absorb thermal neutrons. It is measured in capture units (cu) or sigma units and is primarily influenced by the presence of chlorine in formation water. A higher sigma value generally indicates increased water saturation in the reservoir rock.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/sigma/"
}

Record 3,614 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.