摘要
提出一种利用核磁T2谱结合数字岩心技术计算岩石粒度分布的方法。岩石粒度分布近似符合Weibull分布,改变分布参数可得到不同粒度分布。给出初始Weibull分布后采用过程法构建数字岩心,并用随机行走法对构建的数字岩心进行核磁数值模拟,遍历分布参数区间使模拟得到T2谱与试验T2谱逼近,误差最小时获得的Weibull分布即为岩石粒度分布。最后根据实际核磁测井资料对井下岩石粒度进行连续计算,粒度计算结果与实验室粒度分析结果对比良好,验证了方法准确性。
A new method calculating grain size distribution （GSD） was proposed by using nuclear magnetic resonance （NMR） T2 spectrum and digital rock technology. The curve of GSD is approximately consistent with Weibull distribution, so different CSD can be obtained by changing the parameters of Weibull distribution. According to the initial Weibull distribu- tion, digital rock was constructed by process-based method, and then NMR simulation was conducted on this model by ran- dom walk method. To go through the parameter region of Weibull distribution makes the simulated T2 spectrum approach the measured one. The Weibull distribution determined by these parameters was the GSD of rock. The method was used to calcu- late the GSD of underground rock continuously based on NMR logging. The simulated results agree well with the experimental results and validate the accuracy of this method.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期57-62,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家科技重大专项(2011ZX05006-002)
关键词
核磁测井
粒度分布
数字岩心
核磁模拟
核磁T2谱
nuclear magnetic logging
grain size distribution
digital rock
nuclear magnetic resonance simulation
nuclearmagnetic resonance T2 spectrum
