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《Progress in Geophysics》 2012-01
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Analysis of adaptability of application of NMRlogging in igneous rock reservoirs

SI MA Li-qiang1,ZHAO Hui2*,DAI Shi-hua3(1.School of Earth Resources & Environment,Southwest Petroleum University,Chengdu 610500,China; 2.Geological Exploration And Development Research Institute of Changing Drilling Engineering Co.Ltd.,Chengdu 610051,China; 3.Well Logging Company of Western Drilling Engineering Co.Ltd.,Karamay 83400,China)  
Igneous rocks are characterized by high magnetic susceptibility.Significant difference in magnetic susceptibility was observed between igneous rocks and sedimentary rocks.The magnetic susceptibility of a great part of igneous rocks is higher than a great part of sedimentary rocks.NMR signal can be significant affected by the rock frame of igneous rocks because of the high magnetic susceptibility.A study on the analysis of adaptability of application of NMR logging in igneous rock reservoirs has been carried out and provided the reference for the evaluation of igneous rock reservoirs using Nuclear magnetic resonance logging.In the study,NMR response characteristics of the rocks with high magnetic susceptibility have been analyzed by using the synthetic means of theoretical simulation,experimental analysis and analysis of actual logging data.The results indicate that a part of igneous rocks have high magnetic susceptibility,and the magnetic susceptibility of igneous rocks increased gradually from basic to acid igneous rocks.The igneous rocks with high magnetic susceptibility can generate internal magnetic field gradient in porous media.The stronger internal magnetic field gradient in porous media is,the clearer characteristics of NMR T2 spectrum shifting forward is.The stronger internal magnetic field gradient in porous media is,the greater the magnetic signal attenuation is.The stronger internal magnetic field gradient in porous media is,the greater the error between conventional analysis porosity and NMR porosity is.Under the same circumstances of magnetic susceptibility of rocks,the smaller pore size is,the stronger internal magnetic field gradient in porous media is,and the greater the magnetic signal attenuation is,and the lower the NMR porosity is.Therefore,NMR logging is closely connected with lith,and NMR signal can be significant affected by the rocks with high magnetic susceptibility.It has obvious limitations on igneous reservoirs,especially in the basic igneous rocks and the igneous reservoirs with very small pore throat size.
【Fund】: 国家863课题(2006AA06Z220)项目资助
【CateGory Index】: P631.81
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