张丽华1, 潘保芝1, 单刚义1, 王敏2, 曹玥2
Zhang Lihua1, Pan Baozhi1, Shan Gangyi1, Wang Min2, Cao Yue2
摘要： 为了研究频率对蚀变火山岩横向驰豫时间T2的影响,选取了龙凤山地区的蚀变火山岩岩样,进行了X射线衍射全岩和黏土分析,对其中代表性样品进行了2 MHz和12 MHz的核磁共振测量。研究表明:蚀变的黏土矿物以绿泥石为主;随着核磁共振频率的增大,T2谱有向左偏移的趋势,这种偏移会导致对孔隙结构的错误认识,可以通过拟合公式进行偏移校正。该校正方法可以指导其他频率核磁仪器测量结果广泛地应用。
Abstract: In order to study the effect of frequency on the transverse chirality time T2 of altered volcanic rocks, the altered volcanic rock samples from Longfeng Mountain area were selected for X-ray diffraction whole-rock and clay analysis, and NMR measurements at 2 MHz and 12 MHz were performed on representative samples. The results of the study show that the altered clay minerals are dominated by chlorite; the T2 spectrum tends to shift to the left as the NMR frequency increases; this shift can lead to a false perception of the pore structure and can be corrected for the shift by the fitting formula. This correction method can guide the application of NMR instrument measurements at other frequencies in wells.
中图分类号:
Zhang Lihua, Pan Baozhi, Shan Gangyi, Wang Min, Cao Yue. Effects of Nuclear Magnetic Resonance Frequency on the Transverse Relaxation Time of Altered Volcanic Rocks[J]. Special Oil & Gas Reservoirs, 2023, 30(2): 20-25.