摘要
针对常规测井方法在评价水淹层方面存在的问题 ,分析研究了油层、水层、水淹层在核磁共振测井的标准T2 谱、移谱、差谱上响应特征的差异 ,提出了利用核磁共振测井水淹层响应特征定性识别水淹层的方法 ;在对不同类型的水淹层综合分析的基础上提出了不同的定量评价方法 ,对于中等粘度油的水淹层 ,采用加强扩散移谱法定量确定水淹层的剩余油饱和度 ;对于稠油水淹层 ,采用加强扩散移谱差分谱法定量确定水淹层可动水饱和度。通过定性、定量方法在实际生产中的应用总结出了优化的水淹层核磁共振测井观测模式 ,强调了加强移谱测井是水淹层核磁共振测井中一个必不可少的观测模式。实例分析说明了该方法在实际应用中的有效性和实用性。
To clear up deficiencies in evaluation of the waterflooded zones with the coventional logging methods, different responses of oil zone, water zone and waterflooded zone on T 2 spectrum, shift spectrum and differential spectrum of NMR logging are analyzed, based on which proposed is a qualitative method to identify waterflooded zone and its flooded levels. Based on the analysis of the behaviors of various waterflooded zones, the quantitative method by using enhanced diffussion shift spectrum was provided to calculate the residual oil staturation for the waterflooded zone which contains viscous oil and the other method was also provided to calculate the movable water saturation for the waterflooded zone which contains heavy oil by using the differential spectrum between long and short echo time. Finally, the optimum NMR logging observation model for the water flooded zone is given and the case study shows the effectiveness and practicality of the methods mentioned above.
出处
《测井技术》
CAS
CSCD
2004年第1期34-38,44,共6页
Well Logging Technology
