MLchartDataset catalogue

Humble formula

Term · Oil and gas · MLC-T-OAG-001877

An empirical equation that relates formation factor to porosity in clean, water-bearing sandstones. It provides an alternative to the Archie formula for calculating the formation resistivity factor (F), which is a key input for water saturation calculations. The formula is expressed as F = 0.62 / φ^2.15, where F is the formation factor and φ is the fractional porosity, with constants derived from measurements on a large set of sandstone cores.

Table 1. Record
IdentifierMLC-T-OAG-001877
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-001877",
  "term": "Humble formula",
  "field": "Oil and gas",
  "definition": "An empirical equation that relates formation factor to porosity in clean, water-bearing sandstones. It provides an alternative to the Archie formula for calculating the formation resistivity factor (F), which is a key input for water saturation calculations. The formula is expressed as F = 0.62 / φ^2.15, where F is the formation factor and φ is the fractional porosity, with constants derived from measurements on a large set of sandstone cores.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/humble-formula/"
}

Record 2,011 of 4,468 in Oil and gas terminology (MLC-0103). Request the full dataset.