FIELD: geophysical prospecting, well engineering. SUBSTANCE: for rock porosity coefficient determining and oil-gas well logging treatment neutron-neutron interaction method is using. Well rock exposure is making by two neutron sources using with different energy spectrum of neutron radiation. Epithermal neutron field gradient is determining for each neutron source by not less then two detectors using and rock porosity coefficient is determining by field gradients relation calculating and taking into account volume water containing calibration dependence from porosity coefficient. EFFECT: better accuracy of rock porosity coefficient distribution determining. 3 dwg
