Adaptive logging data interpretation technique with geological
The technique is based on:
the principle of adaptivity for every interpretation module instead of
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
the tuning of algorithms in individual metrological characteristics of
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
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
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.
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.