native mudnatural depletionnatural disintegrationnatural flownatural flowing wellnatural gasnatural gas recoverynatural gas reservesnatural gas sourcenatural potentialnatural rock asphaltnearby fieldneat cementneedle valvenegative separationnest outburstnestwise depositneutron detector adsorberneutron gamma loggingneutron logneutron loggingneutron neutron loggingnew pool test wellnewfield widcatnine spot patternnon commercial wellnon conductive mudnon flowing wellnon magnetic drill collarnon paraffinous oilnon saturated reservoirnormal device spacingnormal foldnormal microsondenormal reservoirnormal sondenormal sp normal self potentialnormal two electrode sondenose rownotch effectnozzle of the bitnuclear lognuclear magnetic resonance loggingnuclear magnetism loggingnull detector