(n). Oil and Gas Business. A method to convey or reserve oil, gas or mineral rights at specific depths or geologic horizons. See: conveyance, horizon, severance
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}