World Fossil-Fuels Depletion

L. David Roper
http://arts.bev.net/RoperLDavid/
23 November 2007

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Contents:

Using the Depletion Theory that I have previously developed, I show here fits to United States and World extraction of crude oil, natural gas and coal. The depletion equation used to fit the extraction data is the Verhulst function:

The Q parameter is the total amount eventually to be extracted. The n parameter is a measure of the asymmetry: symmetric is n=1, skewed to early times is n<1 and skewed to later times is n>1.

United States Crude-Oil extraction
These data came from http://www.eia.doe.gov/pub/international/iealf/table24.xls.

United States Crude-Oil Extraction

U.S. crude-oil discoveries ( http://www.durangobill.com/Rollover.html) and a Verhulst-function fit to the data.
The total amount of U.S. crude oil to be discovered is about 253x109 barrels.
Fit of the Verhulst function to U.S. crude oil extraction. Note that the peak occurred 1975-8:

The total amount to be extracted is 251x109 barrels, almost exactly the same as for the fit to the U.S. Oil Discoveries.
Fit of the Verhulst function to U.S. crude oil extraction and projection to 2100:

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This shows the change in U.S. crude oil extraction since 1945. The biggest recent yearly decrease was -6.7% in 1989 during the BushGHW administration. The average yearly decrease was -3.1% for the BushGHW administration and -2.7% during the Clinton administration. Note that the yearly changes oscillate depending on many factors, but the general trend is downward. No administration should be blamed for most of these factors and no administration can change the fact that the U.S. is running out of economically feasible crude oil.

Another view of crude oil extraction.

U.S. Natural-Gas Extraction

These data came from http://www.eia.doe.gov/pub/international/iealf/table24.xls.
Fit of the Verhulst function to U.S. natural gas extraction. Note that the peak occurred 1978-8:

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Fit of the Verhulst function to U.S. natural gas extraction and projection to 2100.
I suspect that there will be a longer tail than this projection shows.

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United States Petroleum Consumption

These data came from http://www.eia.doe.gov/pub/oil_gas/petroleum/data_publications/petroleum_supply_monthly/current/txt/table_s02_a.txt. U.S. petroleum consumption since 1949. Note the sharp downward turn during the Carter administration (1977-1980); but then the increases started again by the end of Reagan's first term (1981-1988). Then consumption leveled off during the Bush administration (1989-1992) and then continued the upward trend during the Clinton administration (1993-2000). Note how the onset of Alaska extraction caused a temporary rise in U.S. extraction; but then, after a decade, began to decline. The Arctic National Wildlife Refuge is estimated to contain 7 x 109 bbl of oil. This is about one year's consumption, but it will probably be extracted over a decade or longer, which will be a negligible blip on these curves.

United States Petroleum Imports

United States Petroleum imports since 1960. Note the sharp downward trend during the Carter administration (1977-1980); but then the increases started again by the end of Reagan's first term (1981-1988). Then the imports leveled off during the Bush administration (1989-1992) and then continued the upward trend during the Clinton administration (1993-2000). Of course, when consumption increased as U.S. extraction went down, the shortfall had to made up by imports and a little taken from stock.

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United States Coal Extraction


The 340,000 curve is closest to the reported reserves + amount already extracted.

The blue curve is for total eventual extraction of 280 x 109 tons, which is the reserves given in http://www.eia.doe.gov/fuelcoal.html. (Click on Reserves below International Data at the bottom left.) The black curve is for twice that amount and the red curve is for half that amount.

Here is a fit with three Verhulst functions:

The amount to be extracted (area under the curve) is 340,000 (271,000 reserves + 69,000 already extracted). (I.e., about 20% has already been extracted.) I suspect that the currently-shown “peak” will go higher, which means that the drop will then be faster. And there might be later peaks, which would be followed by a faster drop.

The energy contents of the three different classes of coal are:

Coal energy density:
MJ/kg
Anthracite
32.50
Bituminous
24.00
Lignite
16.50

Most of the coal mined in the U.S. is bituminous, with a little lignite. Anthracite extraction is almost negligible:

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World Crude-Oil Extraction

World crude-oil discoveries ( http://www.durangobill.com/Rollover.html) and a Verhulst-function fit to the data.
The total amount of World crude oil to be discovered is slightly less than 2 x 1012 (2 trillion) barrels.

World crude-oil extraction rate and a Verhulst-function fit to the data obtained by fitting the discoveries data and the extraction data together with a common value for the amount to discovered and extracted. That value searched to 1.965x1012 barrels.

World crude-oil extraction per capita. The extrapolation into the future is obtain by using a fit to World population extrapolated into the future (http://arts.bev.net/roperldavid/WorldPop.htm).

Comparison of world oil discoveries and extraction.

The amount under both curves is about 2x1012 barrels.

This graph contains information that probably will have the greatest effect on those now living and born in the future. Crude Oil cannot be extracted if it has not been discovered! This graph shows very clearly why it is very unlikely that the final amount to be extracted will exceed 2x1012 barrels. So far the amount extracted has exceeded 1x1012 barrels, so we are more than halfway there!

Monthly world oil extraction.

The amount extracted per month has been nearly level for three years.

World crude-oil prices

Possibly a better way to project future crude-oil prices is to fit the product of the past prices and the past extraction rate, which yields a world total cost in dollars for crude oil for each year. Neglecting inflation (which could be accounted for by an inflation index as a function of time), it is reasonable to assume that there is a maximum total value, represented by dollars, that the world will assign to crude oil as it becomes depleted. That is, a hyperbolic-tangent function fit to the product might be a reasonable projection to the product. The following graph shows such a fit:

Using the projection of world crude-oil extraction into the future, and the fit in the graph above of the product of price times extraction rate, the projected price of crude oil is:

Another way to project future crude-oil prices is to fit the product of the past prices and the past extraction rate and divide by the population for each year, which yields a world cost in dollars per person for crude oil for each year. Neglecting inflation (which could be accounted for by an inflation index as a function of time), it is reasonable to assume that there is a maximum total value, represented by dollars, that the average person inthe world will assign to crude oil as it becomes depleted. That is, a hyperbolic-tangent function fit to the product/quotient might be a reasonable projection to the product. The following graph shows such a fit:

 

Using the projection of world crude-oil extraction into the future, the projected world population, and the fit in the graph above of the product of price times extraction rate divided by the population, the projected price of crude oil is the blue curve in the following graph.:


The red curve is the same curve as in the third graph above.

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Saudi Arabia crude-oil extraction

This is a single-Verhults and a double-Verhulst fit to the Saudi Arabia crude-oil extraction data with Q=400x109 barrels, which is slightly more than the reported reserves (262x109 barrels) plus the amount already extracted (about 100x109 barrels).

Saudi Arabia crude-oil extraction extrapolated to the year 2100 for the double-Verhults fit and single-Verhulst fit:

The dashed curve is for Q=600x109 barrels, which corresponds to a reserve of about 500x109 barrels.

Apparently recent extraction has overshot the depletion curve, which implies that there will be fast decline in extraction to the depletion curve.

Kuwait crude-oil extraction

This is a two-Verhulst fit to the Kuwait crude-oil extraction data. The total amount to be extracted searched to Q=140x109 barrels, which is very close to the reported reserves (101x109 barrels) plus the amount already extracted (about 37x109 barrels). The single-Verhulst fit was made with the same Q=140x109 barrels value.

United Arab Emirates crude-oil extraction

This is a two-Verhulst fit to the UAE crude-oil extraction data. The total amount to be extracted was set at Q=200x109 barrels, which is somewhat above the reported reserves (98x109 barrels) plus the amount already extracted (about 72x109 barrels). The single-Verhulst fit was made with the same Q=200x109 barrels value.


The dashed curve is for Q=300x109 barrels, which corresponds to a reserve of about 230x109 barrels.

Iran crude-oil extraction

The total amount to be extracted is set at about 190x109 barrels, which is the reported reserves (132x109 barrels) plus the amount already extracted (58x109 barrels).

Iran crude-oil extraction extrapolated to the year 2100:
The dashed curve is for total extraction of about double (400x109 barrels) the solid curve,
which corresponds to a reserve of about 240 x109 barrels.

The large dip in crude-oil extraction due to the Iranian/Islamic Revolution put Iran in a good position for future crude-oil extraction, causing its peak to be delayed until at least 2015.

Iraq crude-oil extraction

The Verhulsts fits have a total amount to be extracted set to Q=200x109 barrels, which is slightly more than the estimated reserves (115x109 barrels) plus the amount already extracted (30x109 barrels).

Due to the animosity between three ethnic groups in Iraq, it appears unlikely that there will be another large peak in crude-oil extraction in Iraq. The more likely scenario is that future crude-oil extraction will oscillate around its depletion curve.

Nigeria crude-oil extraction

This is a two-Verhulst fit to the Nigeria crude-oil extraction data. The total amount to be extracted searched to Q=93x109 barrels, which is about 50% more than the reported reserves (36x109 barrels) plus the amount already extracted (about 26x109 barrels). The single-Verhulst fit was made with Q=100x109 barrels.

The dashed curve is a fit with the Q doubled to Q=200x109 barrels.

Venezuela crude-oil extraction

The total amount to be extracted searched to 163x109 barrels for the single-Verhulst fit, which is greater than the reported reserves amount (80x109 barrels) plus the amount already extracted (53x109 barrels). The 2-Verhulsts fit yielded 70x109 barrels; so there will probably be another extraction peak when Venezuela settles down politically.
Venezuela crude-oil extraction extrapolated to the year 2100:

Mexico crude-oil extraction.

For the 2-Verhulsts fit he total amount to be extracted searched to 56x109 barrels, which is more than the reported eserves amount (13x109 barrels) plus the amount already extracted (32x109 barrels).

Also shown is a single-Verhulst fit with Q=56x109 barrels.

Mexico crude-oil extraction extrapolated to the year 2100:

Also shown is a 2-Verhulst fit with the second peak having Q=100x109 barrels, double the amount for the best fit.

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Soviet-Union/Russia crude-oil extraction.

The total amount to be extracted searched to 207x109 barrels for the 1-Verhulst fit, very close to the reported reserves amount (75x109 barrels) plus the amount already extracted (144x109 barrels). The 2-Verhulsts fit yielded 167x109 barrels; so there will probably be another extraction peak.


Note the drastic drop when the Soviet Union collapsed.

Of course, the first peak is for the entire Soviet Union and the second peak is for Russia alone.

Soviet-Union/Russia crude-oil extraction extrapolated to the year 2100:

The dashed curve is for total extraction of about double (400x109 barrels) the solid curve.

China crude-oil extraction

The reserves reported for China (16x109 barrels) appears to be much too low. (See Verhulst-50 fit below.) The best Verhulst fit yields Q=425x109 barrels, which corresponds to reserves of 390x109 barrels, given that about 35x109 barrels have already been extracted.

United Kingdom crude-oil extraction

The total amount to be extracted for the 2-Verhulst fit searched to 31x109 barrels, slightly more than the reported reserves amount (4x109 barrels) plus the amount already extracted (23x109 barrels)

The single-Verhulst fit is fixed at Q=45x109 barrels, about 50% more than the 2-Verhulst fit.

Canada crude-oil extraction

The reserves reported for Canada (16x109 barrels) appears to be much too low. (See Verhulst-50 fit below.) A fit for 50% more eventually to be extracted is also show (Verhulst-75 for Q=75x109 barrels, which corresponds to reserves of 43x109 barrels, given that about 32x109 barrels have already been extracted.

Norway crude-oil extraction

The reserves reported for Norway (9x109 barrels) matches very closely the Q value (28.5x109 barrels) minus the amount already extracted (20x109 barrels). The crude-oil extraction curve for Norway is the closest to symmetrical of any nation. A fit for 50% more eventually to be extracted is also shown (Verhulst-45 for Q=45x109 barrels, which corresponds to reserves of 25x109 barrels, given that about 20x109 barrels have already been extracted.

World Natural-Gas Extraction:


The blue curve corresponds to known resources. The red curve doubles the known resources.

World Natural-Gas Discoveries:


This and the curve below for world natural-gas extraction were fitted together with a common value for amount eventually discovered and extracted (7.8x1015 ft3).

Comparison of world natural-gas discoveries and extraction.

The amount under both curves is about 7.8 x 1015 ft3.

This graph contains information that probably will have the greatest effect on those now living and born in the future. Natural gas cannot be extracted if it has not been discovered! This graph shows very clearly why it is very unlikely that the final amount to be extracted will exceed 8x1015 ft3. So far the amount extracted is about 3x1015 ft3, so we are more than one-third of the way there!

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World Coal Extraction

The blue curve is for total eventual extraction of 1.5 x 1012 tons, The black curve is for twice that amount and the red curve is for half that amount.. http://www.eia.doe.gov/fuelcoal.html gives 1.00 x 1012 tons as the world reserves. (Click on Reserves below International Data at the bottom left.) There are some indications that the estimated reserves value is too high; if that is so, the peak will occur sooner than 2050.

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