Analysis method for quantitatively characterizing porosity of organic pores of shale by using nuclear magnetic resonance technology

• Main Authors: JIANG QIGUI, SUN ZHONGLIANG, BAO YUNJIE, ZHU FENG, ZHU QINGMIN, LU LONGFEI, LI ZHIMING, SHEN BAOJIAN, LI CHUXIONG
• Format: Patent
• Language: Chinese; English
• Published: 07.11.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses an analysis method for quantitatively characterizing shale organic pore porosity by using a nuclear magnetic resonance technology, which comprises the following steps: A, carrying out nuclear magnetic resonance test on a dried shale sample to obtain a substrate signal; b, after the dried shale sample is saturated with water, performing nuclear magnetic resonance testing, subtracting the base signal obtained in the step A from the obtained signal to obtain a shale sample saturated water relaxation time T2 spectrum, and obtaining the total porosity according to the shale sample saturated water relaxation time T2 spectrum; c, drying the shale sample tested in the step B to obtain saturated light oil; and D, placing the shale sample treated in the step C in a MnCl2 solution for self-absorption to saturate the MnCl2 solution, performing nuclear magnetic resonance testing after the MnCl2 solution is saturated, subtracting the substrate signal obtained in the step A from an obtained signal to