ORIGIN AND OCCURRENCE OF OIL 49
Finally, reservoirs that contain possible crude oil reserves are
those reservoirs in which the estimated quantities of crude oil are
based on limited geological and engineering data, and are commercially recoverable but there is uncertainty about this data precluding
the classification of these reserves, and the reservoirs, as probable.
The degree of risk in relying on reservoir capabilities based on
estimates of possible reserves is greater than the risk for reservoirs
containing estimates of probable reserves.
2.4 Reservoir Evaluation
One of the basic requirements of the preliminary studies of the
reservoir is to provide certifications of oil and gas reserves and
resources — or reservoir evaluation. Geological and geochemical
analyses of hydrocarbons and organic matter in source rocks are
critical in hydrocarbon exploration and in examining the extent and
continuity of hydrocarbon reservoirs. Hydrocarbons may be correlated with source rock to verify the results of basin modeling.
The estimation of crude oil reserves (Chapter 1) is usually subdivided into two components: (1) the total reserves contained in the
reservoir, usually termed the resource, and (2) recoverable reserves —
the portion of the resource that is, as of the date the reserves are calculated, economically efficient given market conditions and rational
use of modern extraction equipment and technologies. The reserve
estimate will change with the price of oil and with the evolution of
new and more efficient recovery technologies.
Thus, the first and foremost goal of operators is to define a reservoir with the least number of wells as possible. Drill operators
drill need to obtain as much as data as possible to define the reservoir parameters and extrapolate them spatially across the field to
economically evaluate the reservoir and plan the best production
method.
The end point is knowledge that will lead to lower production
costs and increased recoverable reserves.
2.4.1 Depletable and Renewable Resources
There are several separate concepts used to classify the stocks of
depletable resources.
Finally, reservoirs that contain possible crude oil reserves are
those reservoirs in which the estimated quantities of crude oil are
based on limited geological and engineering data, and are commercially recoverable but there is uncertainty about this data precluding
the classification of these reserves, and the reservoirs, as probable.
The degree of risk in relying on reservoir capabilities based on
estimates of possible reserves is greater than the risk for reservoirs
containing estimates of probable reserves.
2.4 Reservoir Evaluation
One of the basic requirements of the preliminary studies of the
reservoir is to provide certifications of oil and gas reserves and
resources — or reservoir evaluation. Geological and geochemical
analyses of hydrocarbons and organic matter in source rocks are
critical in hydrocarbon exploration and in examining the extent and
continuity of hydrocarbon reservoirs. Hydrocarbons may be correlated with source rock to verify the results of basin modeling.
The estimation of crude oil reserves (Chapter 1) is usually subdivided into two components: (1) the total reserves contained in the
reservoir, usually termed the resource, and (2) recoverable reserves —
the portion of the resource that is, as of the date the reserves are calculated, economically efficient given market conditions and rational
use of modern extraction equipment and technologies. The reserve
estimate will change with the price of oil and with the evolution of
new and more efficient recovery technologies.
Thus, the first and foremost goal of operators is to define a reservoir with the least number of wells as possible. Drill operators
drill need to obtain as much as data as possible to define the reservoir parameters and extrapolate them spatially across the field to
economically evaluate the reservoir and plan the best production
method.
The end point is knowledge that will lead to lower production
costs and increased recoverable reserves.
2.4.1 Depletable and Renewable Resources
There are several separate concepts used to classify the stocks of
depletable resources.