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Earth s Changing Environment Lecture 7 Global and US Fossil Fuel Resources Oil and Natural Gas Fossil Fuels Formed 50 million to 350 million years ago from plants and animals Fuels Petroleum Natural Gas Coal Shale Oil Tar Sands US Energy Consumption QBtu Petroleum 38 39 Natural Gas 23 24 Oil and Natural Gas Oil Hydrocarbon chains CH2 CH2 CH2 2CH2 3O2 2CO2 2H2O Natural Gas Primarily Methane CH4 CH4 2O2 2H2O CO2 Oil Crude oil is measured in barrels A 42 U S gallon barrel of crude oil provides slightly more than 44 gallons of petroleum products Oil Refinery After crude oil is removed from the ground it is sent to a refinery The crude oil is separated into useable petroleum products Oil Refinery A 42 U S gallon barrel of crude oil provides slightly more than 44 gallons of petroleum products One barrel of crude oil when refined produces 20 gallons of finished motor gasoline Petroleum Products Gasoline Prices Natural Gas Natural gas prices have fluctuated because of variable supply New pipelines from Alaska may solve some of this problem Reserves and Resources Reserves are known sources that are extractable with current technologies at current prices Resources include sources not currently being exploited because of cost and sources not yet discovered Oil and Gas Units Gbo billion barrels of oil G stands for Giga Used for global and US oil resources TCF trillion cubic feet Used for global and US natural gas resources Example Problem 1 US annual oil consumption equals 7 2 Gbo Express this value in millions of barrels per day US Oil consumption 7 2x109 bbl 365 days 20 million bbl day 11 million bbl day imported Global Oil and Gas Reserves Resources Consumption Oil Reserves 1 000 Gbo Resources 1 700 Gbo Consumption 28 Gbo Natural Gas Reserves 5 500 TCF Resources 10 000 TCF Consumption 90 TCF US Oil and Gas Reserves Resources Consumption Oil Reserves 22 Gbo Resources 98 Gbo Consumption 7 2 Gbo Natural Gas Reserves 180 TCF Resources 710 TCF Consumption 23 TCF Global Oil



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