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    • 8. 发明授权
    • Frequency dithering to avoid excitation pulse ringing
    • 频率抖动以避免激励脉冲振铃
    • US07301337B2
    • 2007-11-27
    • US10675187
    • 2003-09-30
    • David Beard
    • David Beard
    • G01V3/00
    • G01N24/081G01V3/32
    • An apparatus and method of obtaining information about a property of interest relating to an earth formation resulting in reduced ringing effects is discussed. A Nuclear Magnetic Resonance (NMR) logging tool is conveyed into a borehole in the earth formation. A first pulse sequence is applied having a first associated measurement frequency, and first NMR signals are measured. The first NMR signals include non-formation signals resulting from an excitation pulse and a refocusing pulse in the first pulse echo sequence. A second and third pulse sequence, at different frequencies from each other and from the first frequency, is applied, and corresponding second and third NMR signals are measured. A phase of the non-formation signals resulting from the first pulse echo sequence and a phase of the non-formation signals resulting from the second and third pulse echo sequences are substantially evenly distributed around a unit circle.
    • 讨论了一种获得关于地球物理相关性质的信息的装置和方法,导致振铃效应降低。 核磁共振(NMR)测井工具被输送到地层中的钻孔中。 应用具有第一相关测量频率的第一脉冲序列,并且测量第一NMR信号。 第一NMR信号包括由第一脉冲回波序列中的激发脉冲和再聚焦脉冲产生的非形成信号。 应用彼此不同频率和第一频率的第二和第三脉冲序列,并且测量对应的第二和第三NMR信号。 从第一脉冲回波序列产生的非形成信号的相位和由第二和第三脉冲回波序列产生的非形成信号的相位基本均匀地分布在单位圆周围。