Rock core magnetic signal acquisition and inversion method based on three-dimensional impulse sequence

• Main Authors: FAN YIREN, GE XINMIN, WU FEI, LIU JIANYU, DENG SHAOGUI, XING DONGHUI
• Format: Patent
• Language: Chinese; English
• Published: 27.04.2018
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a rock core magnetic signal acquisition and inversion method based on a three-dimensional impulse sequence. The rock core magnetic signal acquisition and inversion method comprises the following steps: a rock core sample is placed in a magnet with constant magnetic field intensity, a three-dimensional impulse sequence parameter is set and is applied on the rock core sample,three windows are divided on a time axis of the three-dimensional impulse sequence, and a first window uses counter-rotating to recover the impulse sequence, wherein polarized time is adjustable; a second window uses a gradient coil to apply a pulse gradient magnetic field to a test area and an amplitude of a first echo signal is collected, wherein a pulse gradient size, the window time, and theecho interval are adjustable; and a third window uses the CPMG impulse sequence with the shortest echo interval to collect the amplitude of a second echo signal. The amplitude of the first echo signaland the amplitude of the s