(n). Geophysics. An anomaly that occurs as a ring around a feature, such as electrical or geochemical rings around hydrocarbonaccumulations. See: anomaly.
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}