FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to devices for well logging using nuclear magnetic resonance. The offered nuclear magnetic resonance (NMR) tool for use in a wellbore in a subsurface region is offered, which comprise the magnetic assembly to create a magnetic field in the volume in the subsurface region, and to antenna assembly to generate excitation in the named volume and for receiving from the named volume of response selective by azimuth based on the named excitation. Also, the antenna assembly comprises a cross radiation dipole antenna and a monopole antenna. Also this antenna assembly is configured to receive by means of this nuclear magnetic resonance of the response, selectively by the azimuth of the named volume, using both the cross-radiation dipole antenna and the monopole antenna.
EFFECT: invention is featured by provision of high value of signal to noise ratio, stability to movement and selectivity by azimuth for measurements, as well as stability to the adverse effects of the environment and provision of reliable and accurate information for analysis of subsurface environment.
26 cl, 9 dwg
