Glossary of Technical Terms Used in Reservoir Engineering: Demonstrated Reserves

Demonstrated Reserves

Demystifying Demonstrated Reserves: A Key Concept in Oil & Gas

Understanding the terms used in the oil and gas industry is crucial for anyone involved in investment, regulation, or even just understanding the energy landscape. One such term, often encountered in reports and discussions, is "Demonstrated Reserves." This article aims to provide a clear and concise explanation of Demonstrated Reserves, focusing on its significance and implications.

Demonstrated Reserves is a collective term used by the American Petroleum Institute (API) to encompass both proved and indicated reserves. While seemingly straightforward, this categorization holds critical distinctions for the industry:

1. Proved Reserves: These are the bedrock of any oil and gas operation. They represent the volume of oil and gas estimated with reasonable certainty to be recoverable under current economic conditions. This means that proven reserves are based on:

  • Existing wells and production data: Demonstrating actual production history and reservoir behavior.
  • Detailed geological and engineering studies: Providing a comprehensive understanding of the reservoir and its characteristics.
  • Current market prices and costs: Ensuring the economic viability of extraction and transportation.

2. Indicated Reserves: This category represents economic reserves that reside in known productive reservoirs within existing fields. The key difference lies in the recovery method:

  • Improved recovery techniques: Indicated reserves are expected to respond to techniques that haven't yet been fully proven or haven't been implemented yet.
    • Scenario 1: A new recovery method is installed, but its full impact on production is still being evaluated.
    • Scenario 2: A new method is not yet implemented, but existing knowledge of similar fields and successful techniques suggests its effectiveness.

Why is the distinction important?

  • Risk assessment: Proved reserves are considered low-risk, while indicated reserves hold a higher level of uncertainty due to the unproven nature of their recovery techniques.
  • Financial reporting: Companies must clearly differentiate between proved and indicated reserves in their financial statements.
  • Investment decisions: Investors rely on this distinction to evaluate the potential profitability and risk associated with an oil and gas project.

Demonstrated reserves are a crucial indicator of a company's future production potential and financial health. They provide a snapshot of the resources that can be extracted with a reasonable degree of confidence, taking into account both proven and potentially recoverable reserves. Understanding the nuanced differences between proved and indicated reserves is essential for navigating the complexities of the oil and gas industry.


Test Your Knowledge

Quiz: Demonstrated Reserves

Instructions: Choose the best answer for each question.

1. What does the term "Demonstrated Reserves" encompass in the oil and gas industry? a) Only proved reserves b) Only indicated reserves c) Both proved and indicated reserves d) Only probable reserves

Answer

c) Both proved and indicated reserves

2. Which type of reserve is considered the most certain and reliable? a) Indicated reserves b) Proved reserves c) Probable reserves d) Possible reserves

Answer

b) Proved reserves

3. What is the primary difference between proved and indicated reserves? a) The size of the reservoir b) The location of the reservoir c) The type of oil or gas extracted d) The certainty of recovery methods

Answer

d) The certainty of recovery methods

4. Why is the distinction between proved and indicated reserves important for investors? a) It helps them understand the potential profitability of a project. b) It helps them assess the risk associated with an oil and gas project. c) It helps them compare different companies' financial performance. d) All of the above

Answer

d) All of the above

5. Which of the following is NOT a factor considered when determining proved reserves? a) Existing well production data b) Current market prices c) Potential future technological advancements d) Detailed geological studies

Answer

c) Potential future technological advancements

Exercise: Demonstrated Reserves Calculation

Scenario:

An oil company reports the following reserve data for a particular field:

  • Proved Reserves: 100 million barrels of oil
  • Indicated Reserves: 50 million barrels of oil
  • Probable Reserves: 20 million barrels of oil

Task:

  1. Calculate the total Demonstrated Reserves for this field.
  2. Explain why the Probable Reserves are not included in the Demonstrated Reserves calculation.

Exercice Correction

1. **Total Demonstrated Reserves:** 100 million barrels (proved) + 50 million barrels (indicated) = **150 million barrels** 2. **Probable reserves are not included in Demonstrated Reserves because they represent resources that are less certain to be recoverable. While they have a lower level of certainty than indicated reserves, they are still considered potential resources. The API defines Demonstrated Reserves as a combination of Proved and Indicated reserves, excluding Probable and Possible reserves.


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