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REAL-TIME INVERSION OF ARRAY DIELECTRIC DOWNHOLE MEASUREMENTS WITH ADVANCED SEARCH FOR INTIAL VALUES TO ELIMINATE NON-UNIQUENESS
REAL-TIME INVERSION OF ARRAY DIELECTRIC DOWNHOLE MEASUREMENTS WITH ADVANCED SEARCH FOR INTIAL VALUES TO ELIMINATE NON-UNIQUENESS
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机译:通过对初始值进行提前搜索来消除非唯一性的阵列介电井下测量的实时反演
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摘要
Methods and apparatus for evaluating a volume of an earth formation carried out using complex dielectric measurements. Methods include making measurements of complex permittivity at a plurality of frequencies; identifying an optimal frequency by: identifying candidate frequencies having a corresponding measurement with a respective sensitivity to at least one of i) salinity and ii) water-filled porosity, by determining that each respective sensitivity is substantially independent of rock texture; selecting a maximum of the candidate frequencies as the optimal frequency; using a table search method based on a forward model to generate an initial estimate of at least two parameters of the volume; and using the initial estimate as an initial condition for an inversion of other measurements at frequencies other than the optimal frequency to generate a final solution comprising final estimates for formation properties. The at least two parameters may comprise water salinity and water filled porosity.
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