Caprock

{
  "id": "MLC-T-OAG-000538",
  "term": "Caprock",
  "field": "Oil and gas",
  "definition": "An impermeable or very low-permeability rock layer that overlies a porous and permeable reservoir rock, preventing the upward migration of hydrocarbons. It forms the seal that contains oil or gas within a structural or stratigraphic trap. Common caprock lithologies include shale, anhydrite, and salt, which are effective seals due to their fine-grained texture or crystalline structure.",
  "subject": "Geology",
  "url": "https://mlchart.com/terminology/oil-and-gas/caprock/"
}