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    T2 INVERSIONS WITH REDUCED MOTION ARTIFACTS
    1.
    发明申请
    T2 INVERSIONS WITH REDUCED MOTION ARTIFACTS 有权
    T2反演与减少运动文学

    公开(公告)号：US20150241541A1

    公开(公告)日：2015-08-27

    申请号：US14190337

    申请日：2014-02-26

    申请人： Martin Blanz ,  Holger Frank Thern ,  Radu Coman

    发明人： Martin Blanz ,  Holger Frank Thern ,  Radu Coman

    IPC分类号： G01R33/565 ,  G01V3/38 ,  G01V3/32

    CPC分类号： G01R33/56509 ,  G01N24/081 ,  G01R33/448 ,  G01V3/32 ,  G01V3/38

    摘要： A method for processing nuclear magnetic resonance (NMR) measurement data includes: receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data being affected by a motion artifact and having a first echo train obtained with a long polarization time TWET and a second echo train obtained with a short polarization time TWTL that is shorter than TWET; and at least one of (i) reducing, with a processor, an effect on the NMR measurement data of the motion artifact using the first echo train and the second echo train and (ii) identifying, with a processor, the motion artifact using the first echo train and the second echo train; wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool.

    摘要翻译： 一种用于处理核磁共振（NMR）测量数据的方法包括：用处理器接收从NMR工具获得的NMR测量数据，NMR测量数据受到运动伪影的影响，并具有由长极化获得的第一回波串 时间TWET和以短于TWET的短极化时间TWTL获得的第二回波串; 以及（i）利用处理器减少使用第一回波串和第二回波串的运动假象的NMR测量数据的影响中的至少一个，以及（ii）使用处理器识别运动假象，使用 第一回波列车和第二回波列车; 其中所述运动假象与由所述NMR工具的运动引起的感兴趣体积变化的磁场强度有关。

    NMR T2 DISTRIBUTION FROM SIMULTANEOUS T1 AND T2 INVERSIONS FOR GEOLOGIC APPLICATIONS
    2.
    发明申请
    NMR T2 DISTRIBUTION FROM SIMULTANEOUS T1 AND T2 INVERSIONS FOR GEOLOGIC APPLICATIONS 审中-公开
    NMR T2分布与地质应用的同时T1和T2反演

    公开(公告)号：US20160320519A1

    公开(公告)日：2016-11-03

    申请号：US14701008

    申请日：2015-04-30

    申请人： Martin Blanz ,  Holger Frank Thern ,  Holger Tietjen ,  Mouin Hamdan ,  Radu Coman

    发明人： Martin Blanz ,  Holger Frank Thern ,  Holger Tietjen ,  Mouin Hamdan ,  Radu Coman

    IPC分类号： G01V3/32 ,  E21B47/12 ,  G01R33/561

    CPC分类号： G01V3/32 ,  E21B47/12 ,  E21B49/00 ,  G01N24/081 ,  G01R33/448

    摘要： A method for estimating a property of a subsurface material includes conveying a carrier through a borehole penetrating the subsurface material and performing an NMR measurement in a volume of interest in the subsurface material using an NMR tool having an antenna disposed at the carrier. The method further includes receiving with the antenna a short build-up signal due to a short magnetization build-up time of the NMR measurement, an echo-train signal with short polarization time due to the NMR measurement, and an echo-train signal with long polarization time due to the NMR measurement. The method further includes inverting, simultaneously, the short build-up signal, the short-polarization-time echo-train signal, and the long-polarization-time echo-train signal using a processor to estimate the property; and transmitting a signal comprising the property to a signal receiving device.

    摘要翻译： 用于估计地下材料的性质的方法包括：使用具有布置在载体上的天线的NMR工具，将穿过穿透地下材料的钻孔的载体输送到地下材料中的感兴趣体积中的NMR测量。 该方法还包括由于NMR测量的较短的磁化积聚时间，利用天线接收短的积聚信号，由于NMR测量，具有短的极化时间的回波信号信号以及具有 由于NMR测量，极化时间长。 该方法还包括使用处理器同时反转短积累信号，短极化时间回波串信号和长极化时间回波串信号，以估计该性能; 以及将包括所述特性的信号发送到信号接收装置。

    T2 inversions with reduced motion artifacts
    4.
    发明授权
    T2 inversions with reduced motion artifacts 有权

    公开(公告)号：US09671483B2

    公开(公告)日：2017-06-06

    申请号：US14190337

    申请日：2014-02-26

    申请人： Martin Blanz ,  Holger Frank Thern ,  Radu Coman

    发明人： Martin Blanz ,  Holger Frank Thern ,  Radu Coman

    IPC分类号： G01V3/00 ,  G01R33/565 ,  G01V3/32 ,  G01V3/38 ,  G01N24/08 ,  G01R33/44

    CPC分类号： G01R33/56509 ,  G01N24/081 ,  G01R33/448 ,  G01V3/32 ,  G01V3/38

    摘要： A method for processing nuclear magnetic resonance (NMR) measurement data includes: receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data being affected by a motion artifact and having a first echo train obtained with a long polarization time TWET and a second echo train obtained with a short polarization time TWTL that is shorter than TWET; and at least one of (i) reducing, with a processor, an effect on the NMR measurement data of the motion artifact using the first echo train and the second echo train and (ii) identifying, with a processor, the motion artifact using the first echo train and the second echo train; wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool.

    T2 inversions with reduced motion artifacts
    5.
    发明授权
    T2 inversions with reduced motion artifacts 有权

    公开(公告)号：US10429536B2

    公开(公告)日：2019-10-01

    申请号：US15089893

    申请日：2016-04-04

    申请人： Tobias Kischkat ,  Radu Coman ,  Holger Frank Thern

    发明人： Tobias Kischkat ,  Radu Coman ,  Holger Frank Thern

    IPC分类号： G01V3/32 ,  G01R33/50 ,  G01R33/565 ,  G01N24/08 ,  G01R33/44

    摘要： A method for processing nuclear magnetic resonance (NMR) measurement data includes receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data having an echo train affected by a motion artifact, wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool. The method further includes reducing, with the processor, an effect on the NMR measurement data of the motion artifact by using a correcting inversion method that models the motion artifact to provide a corrected transverse relaxation time constant (T2) distribution, the correcting inversion method having a multiplicative term having a term that includes at least one local maximum and an optional decay term.

    T2 INVERSIONS WITH REDUCED MOTION ARTIFACTS
    6.
    发明申请
    T2 INVERSIONS WITH REDUCED MOTION ARTIFACTS 审中-公开

    公开(公告)号：US20170285214A1

    公开(公告)日：2017-10-05

    申请号：US15089893

    申请日：2016-04-04

    申请人： Tobias Kischkat ,  Radu Coman ,  Holger Frank Thern

    发明人： Tobias Kischkat ,  Radu Coman ,  Holger Frank Thern

    IPC分类号： G01V3/32 ,  G01R33/565 ,  G01R33/50

    CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/448 ,  G01R33/56509

    摘要： A method for processing nuclear magnetic resonance (NMR) measurement data includes receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data having an echo train affected by a motion artifact, wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool. The method further includes reducing, with the processor, an effect on the NMR measurement data of the motion artifact by using a correcting inversion method that models the motion artifact to provide a corrected transverse relaxation time constant (T2) distribution, the correcting inversion method having a multiplicative term having a term that includes at least one local maximum and an optional decay term.

    Motion detection and correction of magnetic resonance data
    9.
    发明授权
    Motion detection and correction of magnetic resonance data 有权

    公开(公告)号：US10126457B2

    公开(公告)日：2018-11-13

    申请号：US15061636

    申请日：2016-03-04

    申请人： Radu Coman ,  Holger Tietjen ,  Martin Blanz ,  Holger F. Thern

    发明人： Radu Coman ,  Holger Tietjen ,  Martin Blanz ,  Holger F. Thern

    IPC分类号： G01V3/32 ,  E21B49/08 ,  E21B47/12 ,  E21B49/00 ,  G01N24/08 ,  G01R33/36 ,  G01R33/383 ,  G01R33/44

    摘要： A nuclear magnetic resonance (NMR) apparatus includes a transmitting assembly configured to emit one or more dual-wait-time pulse sequences, and a receiving assembly configured to detect a long-wait-time echo train and a short-wait-time echo train. The apparatus also includes a processor configured to perform at least one of: estimating a difference between the long-wait-time echo train and the short-wait-time echo train to generate a differential echo-train, inverting the differential echo-train into a differential T2 distribution, and detecting a motion artefact in response to determining that the differential echo-train includes a short-T2 porosity fraction that is greater than a threshold value; and inverting two echo trains into two T2 distributions, calculating at least two porosity fractions for each of the two T2 distributions, estimating a shift of a porosity amount between the at least two porosity fractions, and detecting the motion artefact based on the shift.

    Magnetic resonance pulse sequences and processing
    10.
    发明授权
    Magnetic resonance pulse sequences and processing 有权

    公开(公告)号：US10551521B2

    公开(公告)日：2020-02-04

    申请号：US15151672

    申请日：2016-05-11

    申请人： Radu Coman ,  Martin Blanz ,  Holger Tietjen

    发明人： Radu Coman ,  Martin Blanz ,  Holger Tietjen

    IPC分类号： G01V3/32 ,  G01R33/561

    摘要： A nuclear magnetic resonance (NMR) apparatus includes a carrier configured to be deployed in a borehole, a magnet assembly configured to generate a static magnetic field in an earth formation, and at least one transmitting assembly configured to generate an oscillating magnetic field in a volume of interest within the formation. The apparatus also includes a pulse generator configured to apply a direct-echo pulse sequence to the at least one transmitting assembly, the direct-echo pulse sequence having a plurality of successive pulses including a first pulse and a second pulse configured to generate a first direct NMR echo, and a third pulse, the third pulse selected to at least partially separate a stimulated NMR echo from a second direct NMR echo occurring after the third pulse. The apparatus further includes at least one receiving assembly configured to detect the first and second direct echoes of an NMR echo train.