Fast solution of twodimensional inverse problem of highfrequency electromagnetic logging in oilgas boreholes
© Epov M.I., Glinskikh V.N., Nikitenko M.N., Sukhorukova K.V.
The paper is dedicated to development of physicalmathematical tools of interpretation of the data of electromagnetic logging in
oilgas boreholes. Programalgorithmic means of numerical inversion of relative gainphase characteristics in axissymmetric models have
been worked out. Algorithm of solving fast inverse problem is based on linear inversion and includes analysis of a matrix of sensitivities
of the measured signals to model parameters. Inversion is accompanied by determination of areas of ambiguity of parameters recovery.
High productivity of twodimensional direct problem made possible realization of alternative approach to inversion based on plotting
and analysis of all the ensemble of quasisolutions of twodimensional inverse problem. Elaborated algorithms give possibility to
determine geoelectric parameters of penetration zone and the layer and estimate their inaccuracies. Experiments on recovery of
electroconductivity in typical models of collectors on synthetic and experimental data have been performed.
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