... and limitations of this measurement while drilling (NGD) technique will be highlighted and illustrated in the paper. detector neutron-gamma density measurement formation evaluation well logging rhob crossplot gamma ray log analysis specification GGD measurement density measurement NGD measurement...

... program is selected in each case. chemical source histogram distribution well logging ggd measurement neutron density difference log analysis accuracy differential upstream oil & gas sngd measurement gamma ray consideration lithology formation evaluation operation porosity sngd...