Increasing the Information Content of Reservoir Properties based on Nuclear Magnetic Logging Data in the Geomagnetic Field using New Processing Algorithms

Author details
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation; FSBEI HE "Kazan National Research Technological University", Kazan, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation; FSBEI HE "Kazan National Research Technological University", Kazan, Russian Federation
  • PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation

Abstract

The paper presents the results of applying a new algorithm for processing nuclear magnetic logging (NML) data in a geomagnetic field. The proposed software is used to identify promising intervals in carbonate wells. These intervals, often identical according to standard geophysical surveys, often correspond to reservoirs of varying quality. Consequently, there is a risk of improper perforating and blasting operations, leading to inefficient field development. Using NML as an effective method for testing for mobile fluid, reservoir boundaries are identified with the highest quality and the volume of fluid potentially capable of recovery is determined. The new software enables the application of various filters for pre-processing field data, personalization of data tablets, user customization, and operation logging. The software supports reading field files from various NML instrument modifications in a geomagnetic field, as well as downloading resulting files through a customizable menu for user convenience. Processing NML data and presenting them as relaxation time spectra allowed us to obtain more accurate information on the amount of mobile fluid in the carbonate section and identify the most promising targets within the study interval. The binned representation of the processing results provides information on the prevalence of pores of a particular size within the studied well section, thereby providing an understanding of the pore space structure. Data on the heterogeneity of the distribution of reservoir properties in carbonate deposits provides additional information to the subsoil user for the most effective selection of perforating and blasting operations, reducing the cost of testing unproductive intervals and preserving the integrity of the productive reservoir, ultimately enabling the maximum optimization of field development.

Keywords

nuclear magnetic loggingnuclear magnetic resonancerelaxation time spectracutoff timewellwell loggingmobile fluidporositycarbonate depositsprocessing programgeomagnetic fieldEarth's fieldresonant frequencydrilling mudinterferencegeological section of the well.

Bibliography

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Article information

Published
21 November 2025
Issue date
21 November 2025
Issue
Vol. 25, No. 4 (2025)
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