Cap

{
  "id": "MLC-T-OAG-000530",
  "term": "Cap",
  "field": "Oil and gas",
  "definition": "The uppermost layer or part of a geological body, most often the caprock that forms over the crest of a salt dome, a mass of anhydrite, gypsum and limestone left behind as the salt dissolves. In petroleum geology the word also appears in cap rock, the impermeable layer that seals a trap, and in gas cap, the free gas that lies above oil in a reservoir.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/cap/"
}