| 摘要 |
FIELD: mining.SUBSTANCE: system, method and device are represented for determining the values of porosity of a subsurface layer, adjusted taking into account the well influence. The well tool is lowered into the well of the subsurface layer comprises a source of neutrons, two or more neutron detectors and a data processing scheme. The source of neutrons emits neutrons into the subsurface layer. Two or more neutron detectors are arranged in two or more azimuthal orientations in the well tool and detect the neutrons scattered by the subsurface layer or the well fluid in the well, or both of them. Based on the neutrons detected by the neutron detectors, the electronic data processing scheme determines the value of porosity of the subsurface layer adjusted taking into account the influence of the well.EFFECT: improvement of accuracy of the measurements.29 cl, 37 dwg |
