Assessment of the saturation nature of productive formations based on the analysis of geological parameters

Author details
  • Perm National Research Polytechnic University, Perm, Russian Federation; LUKOIL-PERM LLC, Perm, Russian Federation
  • Perm National Research Polytechnic University, Perm, Russian Federation
  • Perm National Research Polytechnic University, Perm, Russian Federation

Abstract

Monitoring the saturation nature of productive formations is one of the key tasks of oil field geology and monitoring the development of oil and gas fields. The availability of this information allows for prompt decision-making on the effective management of asset development and planning geological and technological activities. In practice, monitoring the saturation nature is carried out during geophysical well surveys. At the same time, the presence of a casing in the well structure, which is typical for almost all operating production facilities in the Perm Krai, reduces the information content of most well geophysical survey methods and minimizes the number of effective tools for solving the problem. Currently, the most reliable assessment of the saturation nature is obtained by pulsed neutron-neutron logging, but this method also has some limitations in practical application. An urgent task is to develop an indirect method for prompt assessment of the saturation nature of formations based on statistical processing of accumulated well geophysical survey data and a set of geological and technological parameters that determine the current saturation of formations. To develop the methodology in this article, an approach was used consisting in constructing a complex probabilistic model based on taking into account the combined influence of each of the used geological and technological parameters on the process under study. The initial stage of the study allowed to assess the degree of influence of each of the indicators, as well as to identify the most informative ones that had a significant impact on the current saturation of the formations. The complex model constructed further is proposed to be used as the basis for the developed methodology, the advantage of which is the ease of use. The developed methodology is not an alternative to pulsed neutron-neutron logging and is recommended for use in the absence of materials or the possibility of conducting geophysical studies of wells.

Keywords

saturation nature of productive formationoil saturationfloodinggeophysical well loggingpulsed neutron-neutron loggingthermal neutron lifetimeneutron count ratioindirect methodmathematical statisticsstatistical analysisindividual probabilitycomplex probability modelstep-by-step regression analysisgeological and technological parametersinformative parameters.

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Article information

Published
1 April 2025
Issue date
1 April 2025
Issue
Vol. 25, No. 2 (2025)
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