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加强型扩散测量方法 (EnhancedDiffusionMethod ,简称EDM )是利用油水扩散特性的差异 ,从被观测流体中得到的NMR信号中 ,区分油水。与标准的NMR测井所采用的短TE 测量方式不同 ,EDM采用相对较长的TE 进行数据采集 ,以恰当地增强扩散效应。EDM测量基本原理是建立一个水的视T2 绝对上限 ,这个水的T2 值可由地层温度和所用测井仪器特性 (TE 和磁场梯度 ) ,通过人工调节而精确地计算出来。大于这个上限值的视T2 测量信号 ,在仪器所测量的敏感区域 ,就会直接而清晰地指示出油的存在。在T2 域中 ,对EDM数据的处理和解释是直接的并且能在现场进行 ,但在T2 域中的解释是定性的 ,该方法在阿根廷南部的SANJORGE盆地进行了应用
EnhancedDiffusionMethod (EDM) is the use of differences in oil-water diffusion characteristics, from the fluid observed in the NMR signal, the distinction between oil and water. Unlike the short TE measurement used in standard NMR logs, EDM uses relatively long TE for data acquisition to properly enhance the diffusion effect. The basic principle of EDM measurement is to establish an apparent upper T2 of water, whose T2 value can be precisely calculated by manual adjustment from the formation temperature and the characteristics of the logging tools used (TE and magnetic field gradient). A T2 measuring signal above this upper limit indicates the presence of oil directly and clearly in the sensitive area measured by the instrument. In the T2 domain, the processing and interpretation of the EDM data is straightforward and can be performed in the field, but the interpretation in the T2 domain is qualitative and is applied in the SAN JORGE basin in southern Argentina