Vs data space retrieval and inversion for surface NMR

L. Liu; D. Grombacher; G. Osterman; E. Auken; J. J. Larsen

Vs data space retrieval and inversion for surface NMR

L. Liu^*, D. Grombacher, G. Osterman, E. Auken, J. J. Larsen

^*Corresponding author for this work

Research output: Contribution to conference › Paper › Research › peer-review

Abstract

Envelope detection is an integral step of the surface NMR data processing workflow to estimate these parameters. We present a new method for retrieving NMR signal envelopes using spectral analysis and the subsequent inversion scheme with the new data space. By exploiting the fact that the spectral magnitude at the Larmor frequency is proportional to the product of the initial amplitude and relaxation time, a high-SNR complex envelope can be extracted by Fourier transform for a number of sliding windows. However, SA estimated envelopes are weighted by the NMR relaxation time during processing and the envelopes have units of volt-seconds. We propose to modify the surface NMR forward model such that it predicts data directly in the voltage-time data space. Field data inversions are presented to demonstrate advantages of pairing the SA envelope detection scheme with a forward model that works in the voltage-time data space.

Original language	English
Publication date	1 Jan 2019
Publication status	Published - 1 Jan 2019
Event	25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019 - The Hague, Netherlands Duration: 8 Sept 2019 → 12 Sept 2019

Conference

Conference	25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019
Country/Territory	Netherlands
City	The Hague
Period	08/09/2019 → 12/09/2019

Cite this

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title = "Vs data space retrieval and inversion for surface NMR",

abstract = "Envelope detection is an integral step of the surface NMR data processing workflow to estimate these parameters. We present a new method for retrieving NMR signal envelopes using spectral analysis and the subsequent inversion scheme with the new data space. By exploiting the fact that the spectral magnitude at the Larmor frequency is proportional to the product of the initial amplitude and relaxation time, a high-SNR complex envelope can be extracted by Fourier transform for a number of sliding windows. However, SA estimated envelopes are weighted by the NMR relaxation time during processing and the envelopes have units of volt-seconds. We propose to modify the surface NMR forward model such that it predicts data directly in the voltage-time data space. Field data inversions are presented to demonstrate advantages of pairing the SA envelope detection scheme with a forward model that works in the voltage-time data space.",

author = "L. Liu and D. Grombacher and G. Osterman and E. Auken and Larsen, {J. J.}",

year = "2019",

month = jan,

day = "1",

language = "English",

note = "25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019 ; Conference date: 08-09-2019 Through 12-09-2019",

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Vs data space retrieval and inversion for surface NMR. / Liu, L.; Grombacher, D.; Osterman, G. et al.
2019. Paper presented at 25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019, The Hague, Netherlands.

Research output: Contribution to conference › Paper › Research › peer-review

TY - CONF

T1 - Vs data space retrieval and inversion for surface NMR

AU - Liu, L.

AU - Grombacher, D.

AU - Osterman, G.

AU - Auken, E.

AU - Larsen, J. J.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Envelope detection is an integral step of the surface NMR data processing workflow to estimate these parameters. We present a new method for retrieving NMR signal envelopes using spectral analysis and the subsequent inversion scheme with the new data space. By exploiting the fact that the spectral magnitude at the Larmor frequency is proportional to the product of the initial amplitude and relaxation time, a high-SNR complex envelope can be extracted by Fourier transform for a number of sliding windows. However, SA estimated envelopes are weighted by the NMR relaxation time during processing and the envelopes have units of volt-seconds. We propose to modify the surface NMR forward model such that it predicts data directly in the voltage-time data space. Field data inversions are presented to demonstrate advantages of pairing the SA envelope detection scheme with a forward model that works in the voltage-time data space.

AB - Envelope detection is an integral step of the surface NMR data processing workflow to estimate these parameters. We present a new method for retrieving NMR signal envelopes using spectral analysis and the subsequent inversion scheme with the new data space. By exploiting the fact that the spectral magnitude at the Larmor frequency is proportional to the product of the initial amplitude and relaxation time, a high-SNR complex envelope can be extracted by Fourier transform for a number of sliding windows. However, SA estimated envelopes are weighted by the NMR relaxation time during processing and the envelopes have units of volt-seconds. We propose to modify the surface NMR forward model such that it predicts data directly in the voltage-time data space. Field data inversions are presented to demonstrate advantages of pairing the SA envelope detection scheme with a forward model that works in the voltage-time data space.

UR - http://www.scopus.com/inward/record.url?scp=85088228474&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85088228474

T2 - 25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019

Y2 - 8 September 2019 through 12 September 2019

ER -

Vs data space retrieval and inversion for surface NMR

Abstract

Conference

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