(adj). Geology. Pertaining to a hydrocarbon source rock that has not fully entered optimal conditions for generation. Ant: Overmature, Post-Mature. See: hydrocarbon, maturity, source rock
Schlumberger Ltd. (The World's Leading Supplier Of Technology, Integrated Project Management And Information Solutions to Customers Working in The Oil and Gas Industry Worldwide), Schlumberger Oilfield Glossary Cedex, France 2014. http://www.glossary.oilfield.slb.com/en/Terms/sym/ a.aspx, (Ergo - Brit) {766}