Oil Shock Models with Different Ultimately Recoverable Resources of Crude plus Condensate (3100 Gb to 3700 Gb)

This is a guest post by Dennis Coyne

The views expressed are those of Dennis Coyne and do not necessarily reflect the views of Ron Patterson.

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The post that follows relies heavily on the previous work of both Paul Pukite (aka Webhubbletelescope) and Jean Laherrere and I thank them both for sharing their knowledge, any mistakes are my responsibility.

In a previous post I presented a simplified Oil Shock model that closely followed a 2013 estimate of World C+C Ultimately Recoverable Resources (URR) by Jean Laherrere of 2700 Gb, where 2200 Gb was from crude plus condensate less extra heavy oil (C+C-XH) and 500 Gb was from extra heavy (XH) oil resources in the Canadian and Venezuelan oil sands.

In the analysis here I use the Hubbert Linearization (HL) method to estimate World C+C-XH URR to be about 2500 Gb. The creaming curve method preferred by Jean Laherrere suggests the lower URR of 2200 Gb, if we assume only 200 Gb of future reserve growth and oil discovery.

Previously, I have shown that US oil reserve growth (of proved plus probable reserves) was 63% from 1980 to 2005. If we assume all of the 200 Gb of reserves added to the URR=2200 Gb model are from oil discoveries and that in a URR=2500 Gb, oil discoveries are also 200 Gb, then 300 Gb of reserve growth would be needed over all future years (we will use 90 years to 2100) or about 35% reserve growth on the 850 Gb of 2P (proved plus probable) reserves in 2010. I conclude that a URR of 2500 Gb for C+C-XH is quite conservative.

A problem with the Hubbert Linearization method is that there is a tendency to underestimate URR.

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US Oil Reserve Growth

This is a guest post by Dennis Coyne.

The views expressed in this post are those of Dennis Coyne and do not necessarily  represent those of Ron Patterson.

How much oil can be extracted from known oil resources profitably? This depends on many factors, the price of oil and technological progress in oil extraction methods are the chief factors, but improved knowledge gained through the development wells drilled and the corresponding output and geological data as known reserves are developed is important as well. Oil reserves do not grow, they deplete as the oil is produced. With increasing knowledge, oil price, and improved technology and production methods, the estimate of oil reserves changes over time and on average these estimates tend to increase, this is what we mean by reserve growth.

The United States Energy Information Administration (EIA) has detailed data on proven (1P) reserves and proven discoveries from 1977 to 2013, but Jean Laherrere has taught us that it is proved plus probable (2P) reserves that we should focus on.

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Reserve Growth in West Siberian Oil Fields

What is Reserve Growth?

BPIn general, a portion of a field’s probable and possible reserves tend to get converted into proved reserves over time as operating history reduces the uncertainty around remaining recoverable reserves: an aspect of the phenomenon referred to as ‘reserves growth’.

Wiki: Experience shows that initial estimates of the size of newly discovered oil fields are usually too low. As years pass, successive estimates of the ultimate recovery of fields tend to increase. The term reserve growth refers to the typical increases in estimated ultimate recovery that occur as oil fields are developed and produced.

Basically the U.S. Security and Exchange Commission have stringent reserve booking requirements for oil companies. As a result early booked reserves of any given field is very conservative. Also, any company would much rather have reserves too low and increase them later than have them too high and have to decrease them later.

But would this not mean that fields of national oil companies, and especially fields that were discovered and developed in the Former Soviet Union have different reserve growth rates than fields developed by publically traded oil firms. The answer is yes and the USGS admits that is exactly the case.

In this publication, Reserve Growth in Oil Fields of West Siberian Basin, Russia, the USGS tells us all we need to know about Reserve growth in West Siberia.

ABSTRACT

Although reserve (or field) growth has proven to be an important factor contributing to new reserves in mature petroleum basins, it is still a poorly understood phenomenon. Although several papers have been published on the reserve growth in the U.S. fields, only limited studies are available on other petroleum provinces. This study explores the reserve growth in the 42 largest West Siberian oil fields that contain about 55 percent of the basin’s total oil reserves.

The West Siberian oil fields show a 13-fold reserve growth 20 years after the discovery year and only about a 2-fold growth after the first production year. This difference in growth is attributed to extensive exploration and field delineation activities between discovery and the first production year. Because of uncertainty in the length of evaluation time and in reported reserves during this initial period, reserve growth based on the first production year is more reliable for model development. However, reserve growth models based both on discovery year and first production year show rapid growth in the first few years and slower growth in the following years. In contrast, the reserve growth patterns for the conterminous United States and offshore Gulf of Mexico show a steady reserve increase throughout the productive lives of the fields. The different reserve booking requirements and the lack of capital investment for improved reservoir management and production technologies in West Siberian fields relative to U.S. fields are the probable causes for the difference in the growth patterns.

RG 3

Four of the five largest fields in Russia are located here in West Siberia, Samotlor, Priob, Lyantor and Fedorov. 61% of Russian production currently comes from Western Siberia. Russia’s second largest field, Romashkino, discovered in 1948, is located in the Volga-Ural Basin and is also in serious decline.

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