二维核磁共振测井识别稠油储层方法研究

Research of the Method for Identifying Heavy Oil Reservoir Using 2D NMR Logs

由于粘度的影响,传统一维核磁共振测井技术在识别稠油储层方面具有一定局限性,驰豫-扩散二维核磁共振测井技术能利用流体横向驰豫、扩散系数的不同,在两个纬度上区分不同流体所在的位置。从核磁共振理论出发,首先分析了一维核磁共振技术在识别稠油储层上的局限,在分析二维核磁共振测井技术原理和实质基础上,阐述了弛豫-扩散二维核磁共振识别稠油储层的原理。最后给出了应用实例,实践表明该方法识别稠油储层是有效的。

The classical one-dimensional NMR logging has some limitations in identifying heavy oil reser- voir, for the impact of viscosity upon NMR But RD2D two-dimensional NMR logging can distinguish the locations of different liquids on two-dimension, for different liquids have different transversal relaxations and different diffusion coefficients. At first, based on NMR theory, this paper analyzed the limitations that one-dimensional NMR logging in identifying heavy oil reservoir, then expatiated the principle of RD2D to identify heavy oil reservoir. At last, one example was offered. This method has a good effect on identifying heavy oil reservoir.