核磁扫描测井在疑难油气藏流体识别中的应用

核磁扫描仪器通过梯度磁场设计对多种频率进行测量,实现1.5 in~※到4 in不同的探测深度,不仅可提供孔隙结构信息,还可利用扩散系数进行流体类型识别。核磁扫描采用扩散编辑方法,改变回波串序列中前2个的回波间隔,使得测量的T_2谱没有前移,但幅度发生变化。对这些幅度变化且包含有扩散信息的多组数据处理得到扩散系数,进而识别探测范围内的流体类型。将该方法应用于东部某油田进行疑难层解释,表明核磁扫描扩散编辑法同核磁测井解释中常用的移谱和差谱识别流体的方法相比可以快速确定储层流体性质。

APPLICATION OF MR SCANNING LOGGING IN IDENTIFYING FLUIDS OF DOUBTFUL RESERVOIRS

MR scanner is the new generation of nuclear magnetic resonance tool of Schlumberger.It has multiple investigation depths(from 1.5in to 4in) through gradient magnetic field design and multiple frequency measurement.It doesn't only provide pore structure information but also identify fluid type with diffusion coefficient.MR scanner uses diffusion editing to change the interval of the first 2 echos which makes amplitude change while T2 spectrum keep unshifted forward.The diffusion coefficient is estimated thro...