(n.) Formation Evaluation. A unit equal to the percentage ofporespace in a unit volume ofrock. It is abbreviated to p. u. and lies between 0 and 100. See: Effective porosity, isolated porosity, microporosity, total porosity
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}