Sylvie Willis
Fossil fuel proved reserves are estimated volumes of fossil fuel energy sources that can be recovered with reasonable certainty from known reservoirs using existing equipment and under current economic and operating conditions. In other words, proved reserves are fossil fuel deposits that we know are there and can be extracted profitably with existing technology. These reserves are important because they represent the portion of fossil fuels that can be utilised in the modern economy. The reserves include fossil fuels such as oil, natural gas, and coal, and they are discovered, recoverable, and commercial. The classification of proved reserves can change over time due to technological advancements, economic factors, and regulatory conditions. The amount of recoverable reserves can vary based on the specific definitions and criteria used, and it is influenced by factors such as extraction technology, profitability, and regulatory approvals.
| Characteristics | Values |
|---|---|
| Definition | Proven reserves are estimated volumes of hydrocarbon resources that can be recovered with reasonable certainty under existing economic and operating conditions. |
| Fossil fuels included | Coal, oil, and gas |
| Factors affecting reserve amounts | Operating conditions, price changes, regulatory and contractual conditions, technological changes |
| Subdivisions | Proved developed reserves, proved undeveloped reserves, probable reserves, possible reserves |
| Reserve categories | 1P, 2P, 3P |
| Global fossil fuel consumption | Significantly increased over the past few centuries, roughly doubling since 1980 |
| Years of fossil fuel reserves left | Approximately 400 years at the current use rate, less than a century if everyone reaches the US rate |
| US crude oil and lease condensate proved reserves | 46.4 billion barrels as of year-end 2023 |
| US natural gas proved reserves | 603.6 trillion cubic feet as of year-end 2023 |
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What You'll Learn
- Proven reserves are fossil fuel energy reserves that can be recovered with reasonable certainty
- Reserves are classified as proven if at least 90% of the resource is recoverable by profitable means
- Operating conditions are considered when classifying proven reserves
- Proven reserves are subdivided into proved developed reserves and proved undeveloped reserves
- Reserves are quantities of oil and gas that are already discovered, recoverable, and commercial
Proven reserves are fossil fuel energy reserves that can be recovered with reasonable certainty
Fossil fuels have been a critical energy source for centuries, but their impact on the environment has led to a growing need to transition to low-carbon alternatives. Proven reserves, also referred to as measured reserves, 1P, or simply reserves, are a measure of fossil fuel energy sources such as oil, gas, and coal that can be recovered with reasonable certainty. This certainty is established through the analysis of geologic and engineering data, confirming that these reserves can be extracted from known reservoirs using existing equipment and under current operating, economic, and technological conditions.
To be considered a proven reserve, it is generally required that at least 90% of the resource can be recovered through economically profitable means. However, the specific threshold can vary, with some sources considering reserves with a recovery rate of over 50% as "probable reserves". The classification of proven reserves is sensitive to price changes and can be influenced by regulatory and contractual approvals.
The discovery of new fields, advancements in technology, and economic shifts can lead to the addition or growth of proven reserves. For example, improvements in exploration and valuation technology led to the inclusion of 2P probable and 3P possible reserves in reporting, in addition to the traditional 1P proved reserves. The categorisation of reserves can vary by region, with some countries using designations such as A, B, and C for developed producing reserves, undeveloped reserves with approved development, and discovered resources without firm development plans, respectively.
The estimation of proven reserves is a complex task, often involving specialist independent reserve valuation consultants. These consultants provide third-party reports for organisations like the Securities and Exchange Commission (SEC) and the SPE Petroleum Resources Management System (PRMS). While these estimates provide valuable insights, it is important to recognise that they are subject to uncertainty due to the inherent complexities of oil and gas estimation.
Proven reserves are a crucial aspect of understanding the availability and lifespan of fossil fuel energy sources. By definition, these reserves represent fossil fuel deposits that can be confidently extracted and utilised, playing a significant role in global energy systems and influencing consumption patterns.
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Reserves are classified as proven if at least 90% of the resource is recoverable by profitable means
Fossil fuel "reserves" are distinct from "resources". Reserves refer to fossil fuels that can be used in the modern economy with modern technology, whereas resources are those that may be used in the future. Proven reserves, also called measured reserves, 1P, and reserves, are a measure of fossil fuel energy reserves, such as oil, gas, and coal reserves.
A reserve is considered proven if it meets certain criteria. It must be probable that at least 90% of the resource is recoverable by economically profitable means. This is determined through an analysis of geologic and engineering data. Operating conditions, such as the operational break-even price and regulatory and contractual approvals, are also taken into account when classifying a reserve as proven. Changes in price can significantly impact the classification of proven reserves.
The term proven reserves can be further subdivided into proved developed reserves and proved undeveloped reserves. It is important to note that this does not include unproven reserves, which are classified as probable reserves (if the recoverable percentage is between 90% and 50%) or possible reserves (if the recoverable percentage is below 50%). The engineering term P90 refers to a 90% engineering probability, which is a specific definition accepted by the Society of Petroleum Engineers. However, this term does not consider economic factors and is different from the business term used in the classification of proven reserves.
The quantity of proven reserves can change over time due to various factors. New proven reserves can be added through new field discoveries, and reserve growth can occur in previously existing fields as technological and economic changes take place. For example, the characteristics of a reservoir may become better understood, fields may be extended laterally, or new oil and gas reservoirs may be found within existing fields.
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Operating conditions are considered when classifying proven reserves
Fossil fuel proved reserves, also known as measured reserves, 1P, or simply reserves, are a measure of fossil fuel energy reserves, such as oil, gas, and coal. These reserves are defined as the "quantity of energy sources estimated with reasonable certainty" to be recoverable from known reservoirs using existing equipment and under current operating conditions. Operating conditions play a crucial role in determining whether a reserve is classified as proven.
Operating conditions encompass several factors, including the operational break-even price, regulatory and contractual approvals, and technological considerations. The operational break-even price refers to the price at which a reserve becomes economically profitable to extract. Regulatory and contractual approvals are also essential, as they grant permission for extraction activities. Changes in regulations and contractual conditions can impact the classification of proven reserves.
Technological advancements can significantly influence the classification of proven reserves. The producible fraction, a purely engineering term, refers to the total amount of fossil fuel that can be extracted using current technology. As technology improves, previously unrecoverable reserves may become classified as proven reserves. Additionally, reserves that were once economically profitable may become unprofitable due to technological changes, affecting their classification.
Regional regulations and market conditions are also considered when classifying proven reserves. These factors can cause unexpected fluctuations in the estimates of proven reserves. For example, changes in regional disclosure regulations may lead to variations in the reported amounts of proven reserves. Market conditions, including supply and demand dynamics, can influence the economic viability of extracting reserves, thereby impacting their classification.
The classification of proven reserves is not static and can change over time due to various factors. The discovery of new reservoirs, improvements in technology, economic fluctuations, and changes in operating conditions can all contribute to shifts in the classification of proven reserves. Therefore, investors and management must consider the interplay of these factors when making decisions regarding fossil fuel reserves.
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Proven reserves are subdivided into proved developed reserves and proved undeveloped reserves
Proven reserves refer to the measure of fossil fuel energy reserves, such as oil, gas, and coal. These are defined as the "quantity of energy sources estimated with reasonable certainty, from the analysis of geologic and engineering data, to be recoverable from well-established or known reservoirs with the existing equipment and under the existing operating conditions." A reserve is considered proven if it is probable that at least 90% of the resource is recoverable by economically profitable means.
The term proven reserves is further subdivided into proved developed reserves and proved undeveloped reserves. Developed reserves are quantities expected to be recovered from existing wells and facilities. These can be further categorised into producing and non-producing reserves. Proved developed producing (PDP) reserves refer to the remaining reserves for currently producing wells with existing equipment and operating methods. Proved developed non-producing (PDNP) reserves refer to recoverable reserves associated with wells waiting to be turned in line or additional reserves that can be obtained through the application of additional technology.
On the other hand, undeveloped reserves are quantities expected to be recovered through future development and additional investments. Proved undeveloped (PUD) reserves refer to reserves associated with undrilled locations offsetting the currently productive units. These reserves are expected to be recovered from existing wells and installed facilities or, if facilities have not been installed, that would involve a low expenditure.
Regulatory and contractual conditions may change and affect the amount of proven reserves. If a reserve's resources can be recovered using current technology but are not economically profitable, it is considered "technically recoverable" but cannot be considered a proven reserve.
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Reserves are quantities of oil and gas that are already discovered, recoverable, and commercial
Fossil fuels are measured in proven reserves, which are quantities of oil and gas that are already discovered, recoverable, and commercial. These reserves are added through new field discoveries, as well as through advancements in technology and changes in economic conditions. For example, the US has seen an increase in crude oil and lease condensate production, with New Mexico having the largest net increase in proved reserves of crude oil and lease condensate in 2023. However, despite these increases, US proved reserves of crude oil and natural gas decreased by 4% and 13% respectively in the same year.
The term "reserves" is often used interchangeably with "resources", but there is an important distinction between the two. Reserves refer to the portion of demonstrated resources that can be recovered economically with current or foreseeable future technology. On the other hand, resources include not only recoverable energy but also energy that is known or suspected to exist, regardless of technical or economic viability. Thus, reserves are a subset of resources.
The US Energy Information Agency defines "proved reserves" for oil as "the estimated quantities of all liquids defined as crude oil, which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions." This definition also applies to gas and coal reserves. Proved reserves are further subdivided into proved developed reserves and proved undeveloped reserves.
The amount of proven reserves can be influenced by regulatory and contractual conditions, as well as the profitability of extraction. If a reserve's resources can be recovered using current technology but are not economically profitable, it is considered "technically recoverable" but not a proven reserve. The categorisation of reserves can also be impacted by price changes, as they determine the economic viability of extraction.
The life of proven reserves depends on the rate of consumption and the discovery of new reserves. While it is challenging to predict the exact lifespan of these reserves, transitioning to alternative energy sources and reducing fossil fuel consumption can help extend them.
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Frequently asked questions
Fossil fuel proved reserves are estimated volumes of fossil fuel energy sources that can be recovered with reasonable certainty under existing economic and operating conditions. In other words, we know it is there, and it would be technologically and economically feasible to extract it.
A reserve is considered proven if it is probable that at least 90% of the resource is recoverable by economically profitable means. Operating conditions, such as regulatory and contractual approvals, are also taken into account when determining if a reserve is classified as proven.
Proved reserves can change over time due to various factors. New reserves are commonly added through new field discoveries or technological and economic changes. Additionally, reserve growth can occur in previously existing fields as we gain a better understanding of the reservoir characteristics or extend the fields laterally. On the other hand, factors such as consumption rates, price changes, and the discovery of new resources can also impact the classification and quantity of proved reserves.
