Analytic study on angular fields of HRR solution

Wang, Wenxin; Tang, Fan; Zhang, Liangxin

doi:10.1007/bf02879051

Sci. China Ser. A-Math.

1998

DOI: 10.1007/bf02879051

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Analytic study on angular fields of HRR solution

Wenxin Wang¹,

Fan Tang

Liangxin Zhang

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2006

2024

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Cited by 5 publications

References 3 publications

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Influence Factors of Multi‐Exponential Inversion of NMR Relaxation Measurement in Porous Media

Liao¹,

Xiao²,

Xie³

et al. 2007

Chinese J of Geophysics

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Multi-exponential inversion of NMR (Nuclear Magnetic Resonance) relaxation signal has been widely used in petroleum industry both in core analysis for petrophysical studies and in logging interpretation for oil exploration. In order to obtain T2 relaxation time distributions with high resolution in the case of low SNR (Signal-to-Noise Ratio), we use simulated and experimental data to analyze the effects on the inversion of the number of pre-selected relaxation times, the number of spin echoes acquired, and the compression in time domain of the spin-echo trains. We found that reducing the number of echoes acquired can cause divergent behavior for the long T2 components, changing the number of windows for data compression does not change the shape of the inverted T2 distribution significantly. We also studied the effect of different SNRs on inverted T2 distributions for different inversion algorithms. We found that the response to different SNRs for different algorithms is different, and suggested using an adjustment parameter to correct such effects.

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Influence Factors of Multi‐Exponential Inversion of NMR Relaxation Measurement in Porous Media

Liao¹,

Xiao²,

Xie³

et al. 2007

Chinese J of Geophysics

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NMR Logging Porosity Activation and Data Processing Method

Xie¹,

Xiao²

2006

Chinese J of Geophysics

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Nuclear Magnetic Resonance (NMR) logging has been widely used in determining porosity of formation. However, it is found that porosity difference between NMR and conventional porosity logging is unacceptable in some oilfields in China. In this paper, we study the Magnetic Resonance Imaging Logging (MRIL) porosity acquisition activation and data processing method. The cause for porosity difference between MRIL and conventional porosity logging is analysed. It is found that there are rich smectite, illite and I/S mixed layer clay minerals in terrestrial sand-shale formation. According to NMR transverse relaxation time T2 of clay minerals and the allocation of partial porosities near the bin of 4ms, the new porosity activation and data processing method are proposed. The reliability of the new method is proved in the laboratory.

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Interpolation Functions Of General Type-2 Fuzzy Systems

Zhao,

Shi

2024

Int. J. Fuzzy Syst.

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Analytic study on angular fields of HRR solution

Cited by 5 publications

References 3 publications

Influence Factors of Multi‐Exponential Inversion of NMR Relaxation Measurement in Porous Media

Influence Factors of Multi‐Exponential Inversion of NMR Relaxation Measurement in Porous Media

NMR Logging Porosity Activation and Data Processing Method

Interpolation Functions Of General Type-2 Fuzzy Systems

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