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NMR Logging Fluid Identification Method Based on DE Pulse Sequence

Author: ZhangZhiPeng
Tutor: LiPengJu
School: Northeast University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: NMR Fluid identification CPMG pulse sequence DE pulse sequence Two-dimensional spectral inversion
CLC: P631.2
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Resistivity logging data in the low resistivity reservoir , flooding layer , complex lithology , complex reservoir space and complex characteristics of fluid reservoir , accurate identification of fluid type and quantitative fluid saturation encounter great difficulties . Nuclear magnetic resonance (NMR) logging measurement reservoir of hydrogen nuclei NMR characteristics , advantages and explain the fluid porosity, permeability , saturation , reservoir the irreducible fluid and movable parameters and study reservoir pore structure characteristics . But the difference spectra shifted spectrum , time domain analysis, diffusion analysis the fluid identification method in the identification of complex reservoir fluid up to a less than satisfactory level . Based CPMG pulse sequence and diffusion editing (DE) pulse sequence , fluid identification methods of the NMR logging 2D spectrum . The method has abandoned the traditional use of a single echo interval measurement echo method , first the formation of new the CPMG and DE pulse sequence using multi- echo spacing and multi-window method , and then create two - dimensional relaxation model of the two pulse sequences Finally, using the conjugate gradient inversion technique from two-dimensional spectral inversion the CPMG and DE pulse sequence measured echo train . And thus can be calculated parameters of reservoir properties , identification and evaluation fluid properties . Different oil and gas saturation in the two-phase oil-water - gas water modeling and inversion numerical experiments show that the oil-water spectrum of two-dimensional oil-water spectrum anti - performances and two-dimensional spectra of gas and water and construction of two - dimensional and two-dimensional gas water spectrum agrees well . Therefore, the fluid identification method is feasible in theory , can be applied to laboratory and logging , identification and evaluation of the reservoir fluid .

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