Metagenesis

{
  "id": "MLC-T-OAG-002325",
  "term": "Metagenesis",
  "field": "Oil and gas",
  "definition": "The last stage of thermal evolution of organic matter in source rocks, following catagenesis, reached at temperatures above roughly 150 to 200 degrees Celsius and vitrinite reflectance above about 2 percent. Remaining kerogen and residual oil crack mainly to dry gas, chiefly methane, and the organic residue becomes increasingly carbon rich. It precedes the onset of metamorphism of the host rock.",
  "subject": "Shale Gas",
  "url": "https://mlchart.com/terminology/oil-and-gas/metagenesis/"
}