公开(公告)号：US20170082775A1

公开(公告)日：2017-03-23

申请号：US15258843

申请日：2016-09-07

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： LIZHI XIAO ,  GUANGZHI LIAO ,  XIN LI ,  FENG DENG ,  SIHUI LUO ,  ZHE SUN ,  WEI LIU ,  WEILIANG CHEN ,  JIE WANG

IPC: G01V3/32 ,  G01V3/14 ,  E21B47/024 ,  G01R33/34

CPC classification number: G01V3/32 ,  G01N24/081 ,  G01R33/3415 ,  G01R33/3808 ,  G01R33/383

Abstract: The present invention provides a multi-azimuth nuclear magnetic resonance logging instrument and an antenna excitation method, the nuclear magnetic resonance logging instrument includes: a probe framework and a shielding layer arranged in the probe framework; a plurality of main magnets are provided above and below the shielding layer, respectively; central axes of the main magnets are parallel with each other, and distances between the central axes of each of the main magnets and a central axis of the probe framework are the same; a distance between central axes of any two main magnets is not smaller than a first preset value; and an antenna is provided at outer side of each main magnet, and a plurality of the antennas are fed independently. In the present invention, circumferential recognizing capability of the nuclear magnetic resonance logging instrument can be improved and three-dimensional (radial, axial and circumferential) stratum detection can be achieved.