Adaptive logging data interpretation

КАФЕДРА ГИС РГУ НЕФТИ И ГАЗА имени И.М.ГУБКИНА

Оказание экспертно-консультационных услуг, экспертная поддержка геофизической разведки месторождений нефти и газа, оценки извлекаемых запасов по данным ГИС

Adaptive logging data interpretation technique with geological intelligence

The technique is based on:

the principle of adaptivity for every interpretation module instead of correction charts;
rigorous petrophysical models instead of empiric correlation dependences;
metrological supplying for gamma-activity logs based on metrological characteristics (radial sensitivity, for example);
communication between separate interpretation modules.

Precision of quantitative interpretation results are provided by:

the tuning of algorithms in individual metrological characteristics of logging tools;
algorithmic calculations of intermediate zones properties;
the technological tuning of algorithms in force formation evaluation methods (logging - force - logging);
using of rigorous petrophysical models instead of empiric correlation dependences;
adaptive technology of complex interpretation (log analysis);
using of cyclemetric analysis.

The adaptive interpretation technology of logging data has not any analogues. There are three main differences of this technique from all other known ones. First of all, this analysis procedures are not required using of hypothetical dependences (gamma-activity vs clayness or porosity vs hydrogen index, for example). Secondly, all formation components content (matrix, clay, fluid, SOM, coal etc.) are determined simultaneously without following corrective action. Petrophysical and geochemical regularity are emerged as the analysis result.

This technique allows:

to determinate and quantitative evaluate untraditional reservoirs, estimate the dynamic porosity taking in account SOM, boron, pyrite, bitumen, zeolite contents (if there is Natural Gamma Spectralog data in the logging complex);
to classify reservoirs on store space structure (if dynamic force formation evaluation methods are used);
to determinate zones of artificial splitting or colmatation (if density log is used);
to estimate mineralogical and granular clayness, different minerals contents affect on reservoir properties in the forming of deposit and due to production (if there is Natural Gamma Spectralog data in the logging complex);
to determinate absolute geological age of formations from wire-logging data and the results of their petrophysical interpretation;
to display sludge breaks according the data even from one well.

Interpretation algorithms are universal for any kind of logging tools with different constructional parameters in any environment conditions.

Papers and References in English

Kozhevnikov D.A., Lazutkina N.Ye., Melchuk B.Yu. Accuracy of spectral gamma-log interpretation models.
Kozhevnikov D.A., Lazutkina N.Ye. Advanced Petrophysical Interpretation of Nuclear Well Logging Data. Nuclear Geophysics, 1995

A new approach to rock component analysis using “adaptive petrophysical tuning” provides three crucially new benefits: an original method for interpreting well logs; an algorithm for adaptive tuning and a reliable method of isolating reservoirs within a section.

Kozhevnikov D.A., Khatmullin I.Ph. A Method of Geometrical Factors in the Theory and Interpretation of Formation Density Log. Nuclear Geophysics, Vol.4, No.4, pp. 413-424, 1990

An interpretation model based on the “radial geometrical factors concept” is developed to describe the count rate of a formation density logging multi-spaced tool.

Kozhevnikov D.A. Interpretation of Nuclear Well Logging Data.

Lectures in Schlumberger Doll Research, 1991

Kozhevnikov D.A., Lazutkina N.Ye. Operative Petrophysical Interpretation of Nuclear Well Logging Data.