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A Novel Method to Enhance the Inversion Speed and Precision of the NMR T_(2) Spectrum by the TSVD Based Linearized Bregman Iteration

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 2451-2463页

作者： Yiguo Chen Congjun Feng Yonghong He Zhijun Chen Xiaowei Fan Chao Wang Xinmin Ge State Key Laboratory of Continental Dynamics Northwest UniversityXi’an710069China Department of Geology Northwest UniversityXi’an710069China Reseach Institute of Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an710075China School of Geosciences China University of PetroleumQingdao266580China

The low-field nuclear magnetic resonance(NMR)technique has been used to probe the pore size distribution and the fluid composition in geophysical prospecting and related ***,the speed and accuracy of the existing numerical inversion methods are still challenging due to the ill-posed nature of the first kind Fredholm integral equation and the contamination of the *** paper proposes a novel inversion algorithmto accelerate the convergence and enhance the precision using empirical truncated singular value decompositions(TSVD)and the linearized Bregman *** L1 penalty term is applied to construct the objective function,and then the linearized Bregman iteration is utilized to obtain fast *** reduce the complexity of the computation,empirical TSVD is proposed to compress the kernel matrix and determine the appropriate truncated *** novel inversion method is validated using numerical *** results indicate that the proposed novel method is significantly efficient and can achieve quick and effective data solutions with low signal-to-noise ratios.

关键词： low field nuclear magnetic resonance linearized bregman iteration truncated singular value decomposition numerical simulations

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Pore size distribution of high volatile bituminous coal of the southern Junggar Basin: a full-scale characterization applying multiple methods

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Frontiers of Earth Science 2021年第2期15卷 237-255页

作者： Wanchun ZHAO Xin LI Tingting WANG Xuehai FU Key Laboratory of Continental Shale Accumulation and Development(Ministry of Education) Northeast Petroleum UniversityDaqing 163000China School of Geology and Mining Engineering Xinjiang UniversityUrumqi 830047China School of Electrical Engineering and Information Northeast Petroleum UniversityDaqing 163000China School of Resources&Earth Science China University of Mining&TechnologyXuzhou 221008China

Studying on the pore size distribution of coal is vital for determining reasonable coalbed methane development *** coalbed methane project is in progress in the southern Junggar Basin of northwestern China,where high volatile bituminous coal is *** this study,with the purpose of accurately characterizing the full-scale pore size distribution of the high volatile bituminous coal of the southern Junggar Basin,two grouped coal samples were applied for mercury intrusion porosimetry,low-temperature nitrogen adsorption,low-field nuclear magnetic resonance,rate-controlled mercury penetration,scanning electron microscopy,and nano-CT measurements.A comprehensive pore size distribution was proposed by combining the corrected mercury intrusion porosimetry data and low-temperature nitrogen adsorption *** relationship between transverse relaxation time(T2,ms)and the pore diameter was determined by comparing the T2 spectrum with the comprehensive pore size *** macro-pore and throat size distributions derived from nano-CT and rate-controlled mercury penetration were distinguishingly *** results showed that:1)comprehensive pore size distribution analysis can be regarded as an accurate method to characterize the pore size distribution of high volatile bituminous coal;2)for the high volatile bituminous coal of the southern Junggar Basin,the meso-pore volume was the greatest,followed by the transition pore volume or macro-pore volume,and the micro-pore volume was the lowest;3)the relationship between T2 and the pore diameter varied for different samples,even for samples with close maturities;4)the throat size distribution derived from nano-CT was close to that derived from rate-controlled mercury penetration,while the macro-pore size distributions derived from those two methods were very *** work can deepen the knowledge of the pore size distribution characterization techniques of coal and provide new insight for accurate pore s

关键词： pore size distribution coalbed methane high volatile bituminous coal low field nuclear magnetic resonance the southern Junggar Basin

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