Need specific range of tempdepth to get oilgas to

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Unformatted text preview: oil may migrate from one aquifer to another where it gets trapped (moves just like groundwater)  ­good traps are layers of non ­permeable rock  ­in There will be Blood the main character talks about how even if a certain landowner won’t sell him the oil rights he’ll just suck it up anyway by drilling the next property over Q: what are some important differences between oil and water?  ­do not mix (different densities)  ­molecular attraction between water and surrounding sand/rock grains is relatively strong  ­not so for oil Q: so in a reservoir, where will you find the oil?  ­water will remain fastened to the sand grains while oil will occupy the larger pore spaces  ­oil will also float to the surface  ­most of the oil resources are not trapped and instead leaks (just like groundwater) into the sea  ­as a result we find most oil in relatively young (Cenozoic: 65 million ­present) rocks (little of the oil has seeped away in that time) Q: so we know that oil reserves are formed from ocean plankton which occur ubiquitously in the world’s oceans, yet oil reserves are not found in all regions once covered in oceans…what controls the distribution of oil?  ­need specific range of temp/depth to get oil/gas to form  ­if temp. is too low, organic matter will not change composition  ­if temps are high but occur in crust that is not very deep, the oil will escape and not be trapped  ­“oil window” below the minimum temp. oil is trapped in a heavy oil formation, above the maximum temperature and the oil is converted to natural gas  ­knowing the conditions favorable for oil you would think it would be relatively straightforward to determine the amount of oil there is in the world but...
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