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5. Find in the text and read out English equivalents of these words and word-combinations.

Неочищенная нефть; попутный газ; происхождение нефти; образоваться из органических веществ; распад органического вещества; преобразоваться в нефть; смесь углеводородов; темная вязкая жидкость; различные химические соединения; состоять из углерода, водорода и кислорода; перемещаться из материнской породы; перепады давления; изменения температуры; разница в плотности между нефтью и соленой водой; накапливаться в породе – коллекторе; пористая порода, насыщенная нефтью; залежь нефти; непроницаемый пласт; накапливаться в достаточном количестве.

6. Answer the following questions.

  1. What does the term “petroleum” include?

  2. Do all geologists believe petroleum to be of organic origin? What points to the organic origin of petroleum?

  3. How did petroleum form?

  4. What is chemical composition of petroleum?

  5. What are the main reasons of oil migration from the source rock?

  6. Where do hydrocarbons accumulate?

  7. What does the term “oil pool” imply? Is it an actual pool or underground lake?

  8. What geologic elements are necessary for oil and gas to create a pool large enough to be worth producing?

  9. Why is it important to investigate petroleum genesis?

7. Match the words and word-combinations from the first column with the words and word-combinations that have the same meaning from the second column.

  1. speculation

  2. composition

  3. point to

  4. migrate

  5. breakdown

  6. convert

  7. oil pool

  8. material

  9. principal

  10. investigation

  11. source rock

  12. determine

  13. place

  14. nearly

  15. quantity

    1. indicate

    2. parent rock

    3. theory

    4. make – up

    5. move

    6. exploration

    7. transform

    8. oil accumulation

    9. decomposition

    10. main

    11. define

    12. substance

    13. amount

    14. almost

    15. location

8. Fill in the blanks with the appropriate prepositions: between, on, in, to, of, for, by, with, over, from.

  1. The organic theory _____ the petroleum origin is accepted _____ most scientists.

  2. Oil formed _____ million of years _____ the remains of marine plants and animals.

  3. The remains of marine plants and animals were covered _____ sand or mud.

  4. The organic materials were slowly converted _____ oil.

  5. Petroleum is a complex mixture _____ hydrocarbons.

  6. The chemical composition points _____ the organic origin of petroleum.

  7. Pressure and temperature changes created the conditions _____ the formation of oil and gas.

  8. Differences _____ density _____ oil and salt water caused the oil to migrate _____ the source rock and to accumulate _____ a reservoir rock.

  9. Oil pool is a porous rock saturated _____ oil.

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