In-Depth Notes on Oil Formation, Distribution, and Environmental Impacts

Definition of Petroleum
Liquid deposits of hydrocarbon material in the earth’s crust.
Formed from decomposition of aquatic animals and plants buried under layers of mud and silt millions of years ago.

Prerequisites for Formation
Key Requirements for Oil Formation
Source Rocks: Must contain suitable marine deposits.
Hydrocarbon Movement: Must allow lateral movement of hydrocarbons through permeable pathways to reservoir rocks.
Sealing Layer: Reservoirs must be capped with an impermeable layer known as cap rock.
Traps: A trap must exist to prevent hydrocarbon migration from the reservoir, ensuring its retention.

Modern Petroleum Deposits
Located within sedimentary basins where rock and marine sediments have accumulated over time.
Exploration Trends: Concentrated on sedimentary formations away from continental shelves.

Historical Discovery of Petroleum
First Discovery: Edwin Drake discovered crude oil in Titusville, Pennsylvania, in 1859, marking the onset of modern petroleum extraction.
Exploration Expansion:
Significant exploration in lower 48 U.S. states and Canada post-discovery.
Notable discoveries included oil in Canada (1902) and the Middle East (first discovered in Iran, 1911).
Early 20th century saw exploration in Mexico and Argentina.

Oil Production Growth
Major Oil Producers:
Russia and Eastern Europe significant in early oil production.
The Middle East saw modest export production in the 1930s, expanding substantially by the mid-century.
Exploration off North Sea revealed new oil sources for Great Britain and Norway starting from the 1960s.

Non-Conventional Sources of Petroleum
Overview:
Conventional Oil: Extracted from natural subterranean reservoirs.
Non-conventional Oil: Includes tar sands and oil shale extraction methods.

Tar Sands
Composed of loose-grained rocks bonded by bituminous material.
Extraction Process:
Oil-bearing sands lifted to a distillery, where separation occurs using hot water, bitumen, and caustic soda.
Notable innovation by Karl Clark (1920).

Oil Shale
Contains kerogen, a waxy substance that can be transformed into synthetic crude oil through heating.
Yield: Historically, yields were around 5000 barrels per day from 3 million tonnes processed during boom years.

Heavy Oil
Stored in underground deposits, requiring steam injection for extraction as it won't flow under normal pressure.
Largest Deposits: Found in the Orinoco Basin, Venezuela, with potential for significant future yield.

Global Oil Reserves
Types:
Proven Reserves (P90): High probability (greater than 90%) of being economically recoverable.
Probable Reserves (P50): Medium probability (greater than 50%).
Possible Reserves (P10): Low probability (greater than 10%).

Global Reserves (2020 Estimates)
Total global reserves: 1732.4 thousand million barrels.
Regional Distribution:
Middle East: 835.9 (48.3%)
South and Central America: 323.4 (18.7%)
North America: 242.9 (14%).

Oil Consumption Trends (2023)
Global Consumption: 100,221 thousand barrels/day.
Major regions:
North America: 23,296 (23.2% share)
Asia Pacific: 38,061 (38.0% share)
Middle East: 9,646 (9.6% share).

Price Volatility
Historical price changes influenced by events such as the Yom Kippur War (1973), Gulf Wars, and the recent COVID-19 pandemic.
Price Fluctuations: Significant spikes and drops noted through decades from $2/barrel in 1972 to around $71.65 by 2023.

Peak Oil Theory
Concept: Oil production increases until a peak, after which a decline is expected, leading to rising prices.
Predictions suggest the global peak oil will occur around 2030, with most oil extraction occurring by 2060.

Factors Influencing Oil Prices
Contributory Factors:
State of the U.S. dollar.
Growth in Asian economies.
New oil discoveries and recoverability issues.