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    • 7. 发明授权
    • Objective oriented methods for NMR log acquisitions for estimating earth formation and fluid properties
    • 用于估算地层和流体性质的NMR测井采集的面向目标的方法
    • US06972564B2
    • 2005-12-06
    • US10288115
    • 2002-11-05
    • Songhua ChenCarl M. Edwards
    • Songhua ChenCarl M. Edwards
    • G01R33/44G01V3/32G01V3/00
    • G01N24/081G01V3/32
    • An objective oriented NMR logging method selects pulse sequences over a plurality of frequencies from a set of building blocks. The building blocks include trainlet sequences wherein each trainlet comprises an excitation pulse and a plurality of refocusing pulses, the total length of a trainlet being typically less than 10 ms. Another building block is a short CPMG or modified CPMG sequence and yet another building block is a regular CPMG or modified CPMG sequence. The modified CPMG sequences may have refocusing pulses with a tipping angle less than 180° to reduce the power consumption. Based on the logging objective (formation evaluation or FE, FE plus hydrocarbon typing, FE plus gas evaluation) the building blocks are combined at a plurality of frequencies with different wait times and TEs.
    • 一种面向目标的NMR测井方法从一组结构单元中选择多个频率上的脉冲序列。 构建块包括列车序列,其中每个列车包括激励脉冲和多个重新聚焦脉冲,列车的总长度通常小于10ms。 另一个构建块是短CPMG或修改CPMG序列,而另一个构建块是常规CPMG或修改CPMG序列。 修改的CPMG序列可以具有小于180°的倾翻角的重聚焦脉冲以降低功耗。 基于测井目标(地层评估或FE,FE加烃类型,FE加气评估),构建块以不同的等待时间和TE的多个频率组合。
    • 10. 发明授权
    • NMR contrast logging
    • NMR对比测井
    • US08610431B2
    • 2013-12-17
    • US13012929
    • 2011-01-25
    • Songhua ChenDaniel Georgi
    • Songhua ChenDaniel Georgi
    • G01V3/00
    • G01V3/32
    • An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus includes: a carrier configured to be conveyed through the borehole; a nuclear magnetic resonance (NMR) instrument disposed at the carrier and configured to perform an NMR measurement on a volume sensitive to the NMR measurement; and a contrast agent disposed in the volume and comprising particles that form a suspension in a liquid, the suspension of particles being configured increase a magnetic field gradient of at least one earth formation material in the volume to change an NMR relaxation time constant of the at least one earth formation material; wherein the NMR measurement on the volume containing the at least one earth formation material and the contrast agent is used to estimate the property.
    • 一种用于估计由钻孔穿透的地层的性质的装置,所述装置包括:构造成被输送通过所述钻孔的载体; 设置在载体上并被配置为对对NMR测量敏感的体积进行NMR测量的核磁共振(NMR)仪器; 以及设置在体积中并包含在液体中形成悬浮液的颗粒的造影剂,构造的颗粒悬浮液增加体积中的至少一种地球形成材料的磁场梯度,以改变在该体积中的NMR弛豫时间常数 至少一个地层材料; 其中使用包含至少一种地球形成材料和造影剂的体积上的NMR测量来估计该性质。