MLchartDataset catalogue

Pseudostatic spontaneous potential

Term · Oil and gas · MLC-T-OAG-002986

The spontaneous potential recorded opposite a thick, permeable, shaly bed, which is smaller than the static spontaneous potential that clean sand with the same fluids would give, because shale reduces the electrochemical potential. The ratio of the two is the SP reduction factor, and one minus that ratio gives a simple estimate of shale volume.

Table 1. Record
IdentifierMLC-T-OAG-002986
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-002986",
  "term": "Pseudostatic spontaneous potential",
  "field": "Oil and gas",
  "definition": "The spontaneous potential recorded opposite a thick, permeable, shaly bed, which is smaller than the static spontaneous potential that clean sand with the same fluids would give, because shale reduces the electrochemical potential. The ratio of the two is the SP reduction factor, and one minus that ratio gives a simple estimate of shale volume.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/pseudostatic-spontaneous-potential/"
}

Record 3,178 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.