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user non-penetrating
metal box staff, manpower
to be trapped to cause the death

5 Find antonyms in the text for the following words.

permeable to give birth, to produce (marine
undistorted life)
prevent ineffectively
high-frequency suffer (sustain) losses

6 Say whether the following statements are true or false.

1 The simplest hydrocarbon is methane. It has two atoms of
carbon (C) and six atoms of hydrogen (H).
2 Under abnormal pressure and normal temperature, methane is
gas.
3 Ethane, propane, butane never occur in natural gas.
4 Crude oil is a hydrocarbon mixture that often occurs a liquid,
though some crude oils are very thick and dense and do not flow
easily.
5 Crude oil that does not contain hydrogen sulfide is classified as
“sour crude”.
6 A reservoir rock is also permeable – that is, its pores are
connected.
7 Geologists classify reservoir traps into three basic types: fault
traps, anticlinal traps and stratigraphic traps.
8 An anticline is an upward fold in the layers of rock, much like
a domes arch in a building.
9 Seismology is the study of sound waves that bounce off the
buried rock layers.
10 A development well is drilled in existing oilfield.

7 Fill in the gaps.

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