122 PETROLEUM TECHNOLOGY, ECONOMICS, AND POLITICS
4.2.3 Russian Standards
The Russian classification of crude oil reserves differs significantly
from SEC standards and SPE standards with respect to the manner
and extent to which commercial factors are taken into account in
calculating reserves. While the Russian reserves system focuses on
the actual physical presence of hydrocarbons in geological formations, the reserves of crude oil are estimated based on the probability of such physical presence (http://econ.la.psu.edu/CAPCP/
RussianData / data / classification, pdf).
The system is based solely on the analysis of geological attributes. Explored reserves are represented by categories A, B, and
Cl; preliminary estimated reserves are represented by category C2;
potential resources are represented by category C3; and forecasted
resources are represented by categories Dl and D2.
Category A reserves are calculated on the part of a deposit drilled
in accordance with an approved development project for the oil or
natural gas field and are reserves that have been analyzed in sufficient detail to define the following comprehensively:
1. The type, shape and size of the reservoir
2. The level of hydrocarbon saturation
3. The reservoir type; the nature of changes in the reservoir characteristics
4. The hydrocarbon saturation of the productive strata of
the deposit
5. The content and characteristics of the hydrocarbons
6. The major features of the deposit that determine the
conditions of its development (mode of operations,
well productivity, strata pressure, natural gas, gas
condensate and crude oil balance).
Category B reserves represents the crude oil which has been
determined on the basis of commercial flows of oil in wells. The
classification of reserves into this category include the following:
1. The shape and size of the reservoir
2. The oil saturation depth and type of the reservoir
3. The nature of changes in the reservoir characteristics
4. The oil saturation of the productive strata of the
reservoir
5. The composition and characteristics of the crude oil.
4.2.3 Russian Standards
The Russian classification of crude oil reserves differs significantly
from SEC standards and SPE standards with respect to the manner
and extent to which commercial factors are taken into account in
calculating reserves. While the Russian reserves system focuses on
the actual physical presence of hydrocarbons in geological formations, the reserves of crude oil are estimated based on the probability of such physical presence (http://econ.la.psu.edu/CAPCP/
RussianData / data / classification, pdf).
The system is based solely on the analysis of geological attributes. Explored reserves are represented by categories A, B, and
Cl; preliminary estimated reserves are represented by category C2;
potential resources are represented by category C3; and forecasted
resources are represented by categories Dl and D2.
Category A reserves are calculated on the part of a deposit drilled
in accordance with an approved development project for the oil or
natural gas field and are reserves that have been analyzed in sufficient detail to define the following comprehensively:
1. The type, shape and size of the reservoir
2. The level of hydrocarbon saturation
3. The reservoir type; the nature of changes in the reservoir characteristics
4. The hydrocarbon saturation of the productive strata of
the deposit
5. The content and characteristics of the hydrocarbons
6. The major features of the deposit that determine the
conditions of its development (mode of operations,
well productivity, strata pressure, natural gas, gas
condensate and crude oil balance).
Category B reserves represents the crude oil which has been
determined on the basis of commercial flows of oil in wells. The
classification of reserves into this category include the following:
1. The shape and size of the reservoir
2. The oil saturation depth and type of the reservoir
3. The nature of changes in the reservoir characteristics
4. The oil saturation of the productive strata of the
reservoir
5. The composition and characteristics of the crude oil.