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为了获取疏松砂岩全面、准确的物性参数,利用核磁共振分析技术,分别对疏松砂岩的岩心和岩屑进行核磁共振实验,分析研究了二者的T2弛豫时间谱及核磁渗透率模型。结果表明,疏松砂岩岩屑与岩心的T2弛豫时间谱符合得很好,T2谱分布特征参数的平均绝对偏差均小于4.1;渗透率数学模型系数C的平均值相对偏差很低,仅为0.92%。由此认为,可以利用岩屑来代替岩心进行疏松砂岩物性参数的分析,建立了疏松砂岩储层物性参数分析的新方法,弥补了不成形疏松砂岩无法进行常规渗透率测试的不足。
In order to obtain the comprehensive and accurate physical parameters of unconsolidated sandstone, nuclear magnetic resonance (NMR) analysis was used to conduct nuclear magnetic resonance experiments on loose sandstone cores and cuttings respectively. The T2 relaxation time spectrum and NMR permeability model were analyzed. The results show that the T2 relaxation time spectrum of unconsolidated sandstone debris conforms well with the core, and the mean absolute deviation of the T2 spectral distribution parameters is less than 4.1. The mean relative deviation of permeability mathematical model C is very low, only 0.92 %. Therefore, it can be considered that the cuttings can be used instead of cores to analyze the physical parameters of unconsolidated sandstone, and a new method to analyze the physical property parameters of unconsolidated sandstone reservoirs has been established, which can make up the insufficiency of conventional permeability tests of unshaped loose sandstone.