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Lecture 19 - Lecture 19 Nuclear Power Oil Gas Migration Oil...

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Lecture 19 Nuclear Power Oil & Gas Migration Oil & gas transported out of fine-grained source rocks by o Buoyancy o Flowing groundwater Trapped by overlying layers of low permeability rock o Oil & gas reservoirs (traps) Oil Recovery We drilled into petroleum trap Oil initially gushes out of ground because it is under pressure Later it needs to be pumped out of ground (primary recovery) When flow falls off, water is pumped into reservoir to fill empty pores & “float” oil upwards to well (secondary recovery) Enhanced recovery o Pumping in of pressurized fluids or gases to force more oil out o Hydrofracturing of surrounding rocks to increase permeability o Pumping in of hot water or steam to increase flow by decreasing viscosity of the oil Nuclear Power Nuclear power supplies about 6.5% of the world’s commercial energy, but supplies a much larger percentage of electrical generation in some industrial countries Table 7-1
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