48 PETROLEUM TECHNOLOGY, ECONOMICS, AND POLITICS
in the reservoir, provides support for the engineering analysis on
which the project or program was based.
Furthermore, reservoirs are not included in the proven category
when the estimates of crude oil reserves in those reservoirs include
crude oil that may become available from known reservoirs but is
classified separately as indicated additional reserves, when recovery of the crude oil is subject to reasonable doubt because of uncertainty as to geology, reservoir characteristics, or economic factors,
and crude oil that may occur in undrilled prospects.
Proved developed reservoirs contain proved developed oil
reserves that can be recovered through existing wells with existing equipment and operating methods. These reservoirs also contain additional crude oil that is obtained through the application of
fluid injection or other improved recovery techniques for supplementing the natural forces and mechanisms of primary recovery.
However, such reservoirs must have been successfully tested for
production of crude oil by a pilot project, or after the operation of
an installed program has confirmed through production response
that increased recovery will be achieved from the reservoir.
Proved undeveloped reservoirs are reservoirs that contain
proved undeveloped oil reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells
where a relatively major expenditure is required for recompletion. However, reservoirs that are undrilled are limited to those
reservoirs that are reasonably certain of production when drilled.
Proved reserves for other undrilled reservoirs can be claimed only
where it can be demonstrated with certainty that there is continuity of production from the existing productive reservoir formation. Under no circumstances should a reservoir containing proved
undeveloped reserves be included in the reserve estimate unless an
application of fluid injection or other improved recovery technique
is contemplated and unless such techniques have been proved
effective by actual tests in the area and in the same reservoir.
Reservoirs that contain probable crude oil reserves are reservoirs
that contain estimated quantities of crude oil, which geological and
engineering data infer to be commercially recoverable, but there
is uncertainty about this data precluding the classification of these
reserves as proven.
The degree of risk in relying on reservoir capabilities based on
estimates of probable reserves is greater than the risk for reservoirs
containing estimates of proven reserves.
in the reservoir, provides support for the engineering analysis on
which the project or program was based.
Furthermore, reservoirs are not included in the proven category
when the estimates of crude oil reserves in those reservoirs include
crude oil that may become available from known reservoirs but is
classified separately as indicated additional reserves, when recovery of the crude oil is subject to reasonable doubt because of uncertainty as to geology, reservoir characteristics, or economic factors,
and crude oil that may occur in undrilled prospects.
Proved developed reservoirs contain proved developed oil
reserves that can be recovered through existing wells with existing equipment and operating methods. These reservoirs also contain additional crude oil that is obtained through the application of
fluid injection or other improved recovery techniques for supplementing the natural forces and mechanisms of primary recovery.
However, such reservoirs must have been successfully tested for
production of crude oil by a pilot project, or after the operation of
an installed program has confirmed through production response
that increased recovery will be achieved from the reservoir.
Proved undeveloped reservoirs are reservoirs that contain
proved undeveloped oil reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells
where a relatively major expenditure is required for recompletion. However, reservoirs that are undrilled are limited to those
reservoirs that are reasonably certain of production when drilled.
Proved reserves for other undrilled reservoirs can be claimed only
where it can be demonstrated with certainty that there is continuity of production from the existing productive reservoir formation. Under no circumstances should a reservoir containing proved
undeveloped reserves be included in the reserve estimate unless an
application of fluid injection or other improved recovery technique
is contemplated and unless such techniques have been proved
effective by actual tests in the area and in the same reservoir.
Reservoirs that contain probable crude oil reserves are reservoirs
that contain estimated quantities of crude oil, which geological and
engineering data infer to be commercially recoverable, but there
is uncertainty about this data precluding the classification of these
reserves as proven.
The degree of risk in relying on reservoir capabilities based on
estimates of probable reserves is greater than the risk for reservoirs
containing estimates of proven reserves.