利用核磁共振录井技术定量评价储层的分选性

储层分选性是反应储层物性、 均质程度及沉积环境好坏的重要标志. 分选系数一般是通过实验室的粒度分析（粒度分选）或压汞试验（孔喉分选）来得到，利用核磁共振评价储层孔喉分选性多是通过建立T_2g与常规分选系数之间的关系公式来得到. 在深入研究常规分选系数计算原理的基础上，结合T₂谱累积曲线对储层分选性的反应，提出了2种不依附于实验室分析、可由单个样品来定量评价储层分选性的新方法，并且取得了与其他方法较为一致的评价结果. 该项研究打破了录井不能定量评价储层分选性的局面，对于快速指导油气勘探开发具有十分重要的意义.

Quantitative Evaluation of Reservoir Separation with MR-ML Technology

Reservoir separation factor is an important index relfecting petrophysics, heterogeneity and depositional environment of the reservoir. Separation factor is usually calculated through grading analysis (grain size sorting) and mercury intrusion method (pore throat sorting) in laboratory. Pore throat sorting calculated by NMR method was usually based on calibration curve relating T_2g to separation factor measured by conventional methods. Based on the theory underlying conventional separation factor calculation, and combined with sorting characteristics associated with cumulative T₂ distribution, two new methods were proposed to evaluate reservoir sorting on a single sample. The calculation results of these two methods were found to be consistent with those obtained by other methods.