POSSIBILITIES OF NUMERICAL INVERSION OF LATERAL LOGGING DATA FOR DETERMINING THE GEOELECTRICAL PARAMETERS OF RESERVOIRS IN THE NORTHERN FIELDS OF WESTERN SIBERIA
Primakov S.A., Sukhorukova K.V.
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia
Keywords: lateral logging, numerical modeling, numerical inversion, two-dimensional axially symmetric geoelectrical model, oil-and-gas-saturated reservoir, electrical resistivity, northern fields of Western Siberia.
Abstract
The article presents the results of numerical modeling and inversion of Lateral Logging (LL) data for determining the geoelectrical parameters of oil-and-gas-saturated reservoirs in the northern fields of Western Siberia. The research is based on the analysis of synthetic LL signals calculated for a typical model of the Achimov deposits of the Yamburg field, which are characterized by small reservoir thickness. The influence of changes in parameters such as the formation resistivity, the invaded zone thickness, and depth shift on the LL signals is considered. An assessment of the accuracy of reservoir parameter recovery using two-dimensional numerical inversion was carried out, areas of equivalence were identified, and recommendations for error minimization are proposed. The results showed that the greatest sensitivity of the LL signals is observed to changes in the formation resistivity and the invaded zone thickness, with the error in determining the formation resistivity being up to 12%.
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