An algorithm for multi-exponential inversion of T2spectrum in nuclear magnetic resonance |
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| Authors: | HAN Chunjiang ＲEN Li and WANG Zhuwen |
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| Institution: | 1． College of Geo-Exploration Science and Technology，Jilin University，Changchun 130026，China; 2． Daqing Wireline Logging Company，Daqing 163412，Heilongjiang，China |
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| Abstract: | NMＲ logging can provide the permeability parameter and abundant stratigraphical information such as total porosity，oil，gas and water saturation，oil viscosity，etc． And these physical parameters can be ob- tained by T2spectrum inversion． NMＲ inversion is an important part in logging interpretation． The authors de- scribe a multi-exponential inversion algorithm，solid iteration redress technique (SIＲT)，and apply the algo- rithm in real data and compare the results with those based on singular value decomposition (SVD)． It shows that SIＲT algorithm is easier to be understood and implemented，and the time spent in SIＲT is much shorter than that of SVD algorithm． And the non-negative property of T2spectrum is much easier to be implemented． It can match the results based on SVD very well． SIＲT algorithm can be used in T2spectrum inversion for NMＲ analysis． |
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| Keywords: | NMＲ logging T2spectrum SIＲT algorithm inversion |
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