... coal of low Moisture Content these variations can be recognized by applying a Neutron logging tool with a relatively short source-detector spacing (0.25 m). This differentiation enables the main coal quality parameters, i. e. Ash Content, Volatile Matter and Calorific Value, to be determined accurately...

..., mud filtrate invasion, tool eccentricity, borehole casing, rock matrix composition, matrix moisture content, formation water composition, neutron poisons, thin ore beds, ore bed dipping angle, and ore grade. "Noise" radiation from fast fission in thorium ore and delayed oxygen neutrons (DON) have also...

... of the coal seams and arrangement of intercalations within the seams. Evaluation of the ash content. Investigation of the moisture content. Determination of the degree of coalification. By comparison of the log derived values with core data and results of laboratory investigations it was found...

... & Gas neutron assumption variation porosity log analysis moisture content zone 1 hydrogen index constituent computed porosity evaluation Symposium saturation well logging shale coefficient procedure shaly sand gas saturation quantity correction equation SPWLA TENTH ANNUAL...