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目前,T2截止值的确定问题是核磁共振测井应用的困难之一。T2截止值是决定核磁共振测井资料解释的一个关键参数,对于确定孔隙度、渗透率、饱和度等解释参数十分重要。目前国内外如斯伦贝谢公司推荐T2截止值在砂泥岩和碳酸盐岩地层分别选用33ms和92ms。实际研究发现T2截止值是变化的而非是单一值。直接运用经验值计算地层参数势必会产生误差。因此,根据测量对象的不同,基于岩心实验法,探讨了T2截止值的确定方法,并证明了其可行性。
At present, the problem of determining the T2 cutoff value is one of the difficulties in the application of nuclear magnetic resonance logging. The T2 cutoff is a key parameter that determines NMR interpretation and is important for determining interpretation parameters such as porosity, permeability, and saturation. At home and abroad, such as Schlumberger recommended T2 cutoff sandstone and carbonate strata were selected 33ms and 92ms. The actual study found that T2 cut-off value is a change rather than a single value. Calculating formation parameters directly using empirical values is bound to produce errors. Therefore, according to the different objects, the method of determining the T2 cut-off value is discussed based on the core experiment method, and its feasibility is proved.