31 - further upwards 2. oil trap geometry 3-dimensional...

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GSC 26/03/2008 13:57:00 Natural gas, oil, and tar are all hydrocarbons…… 1. microscopic plankton (algae + animals) in body of water (lake or ocean) die,  settle to oxygen-poor…. . 2. …. 3. burial (increased temp. …. 4. further increase in T, P (> 4 km depth)  “cracking” of kerogen …. - process of oil contained in sourvce rock is labor-intensive and expensive - once oil and gas form, they tend to migrate upward (less dense than water) - can escape to the surface ( example: La Brea tar pits) - can migrate into  Oil reservoir rock      – need 1. high  porosity (pore space) 2. high  permeability (connectivity btwn  pores) 3.  trapping mechanism  Oil traps      – need 1.  Seal rock – impermeable overlying rock that prevents oil and gas from moving 
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Unformatted text preview: further upwards 2. oil trap geometry 3-dimensional geological situation that focuses oil/gas migration into trap Environmental considerations - Negative impacts of oil drilling & transportation - Examples: Ecological footprint of drilling operations Oil spills Natural gas ~ 95% methane (CH4) - highly flammable - in deep ocean sediments (>1600 ft) can form methane hydrate (frozen methane & water) methane hydrate is in large deposits on continental shelves sudden realeases of methane due to warming may cause o sinking ships (?) o rapid warming at end of ice ages (methane is a greenhouse gas 20x stronger than CO2) 26/03/2008 13:57:00 26/03/2008 13:57:00...
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This note was uploaded on 04/07/2008 for the course GSC 106 taught by Professor Dr.hood during the Spring '08 term at University of Miami.

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31 - further upwards 2. oil trap geometry 3-dimensional...

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