Basic Exchange : The replacement of cations associated with the clay surface by those of another species, e.g., the conversion of sodium clay to calcium clay. (Bul 10C, Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}