中国石油大学学报（自然科学版）Issue(1)：50-59,10.DOI:10.3969/j.issn.1673-5005.2015.01.007
D-T2二维核磁共振脉冲序列改进设计及性能对比
An improved design of D-T2 2 D NMR pulse sequence and performance comparison
摘要
Abstract
In order to solve the difficulties in D-T2 2D NMR technology that cannot balance the dynamic range of the diffusion coefficient measurements and the transverse relaxation resolution in practical applications, an improved design of D-T2 2D NMR pulse sequence, based on two"windows" and bivariate on pulsed filed gradient, was proposed, after summarizing the technical characteristics of PFG (pulsed filed gradient), STE-PFG (stimulated echo pulsed filed gradient), BP-PFG(Bi-polar pulsed filed gradient) , modified CPMG ( Car-Purcel-Meiboom-Gill) , "diffusion editing", and multi echo intervals CPMG pulse se-quences. The numerical simulation results of different structural models ( gas-water, oil-water and heavy oil-water) under dif-ferent signal-to-noise ratios show that the modified D-T2 pulse sequence balances the diffusion coefficient measurement range and transverse relaxation resolution successfully. The new pulse sequence has wide applications in the exploration and formation evaluation for unconventional reservoir, and will benefit future development of D-T2 2D NMR technology.关键词
二维核磁共振/扩散系数/横向弛豫分辨率/脉冲梯度场/双变量/改进脉冲序列/数值模拟Key words
2D NMR/diffusion coefficient/transverse relaxation resolution/pulsed filed gradient/bivariate/modified pulse sequence/numerical simulation分类
天文与地球科学引用本文复制引用
吴飞,范宜仁,王帅,邓少贵,邢东辉,巫振观,杨培强..D-T2二维核磁共振脉冲序列改进设计及性能对比[J].中国石油大学学报（自然科学版）,2015,(1):50-59,10.基金项目
“十二五”国家油气重大专项(2011ZX05020008-002) （2011ZX05020008-002）
国家重大科学仪器设备开发专项(2013YQ170463) （2013YQ170463）
国家自然科学基金项目(41174009,41474100) （41174009,41474100）
