Ф 03-03 Kasymova Zh. Zh

13.3. Complete the sentences using correct prepositions where necessary.
1. Most petroleum exploration is done ___ the reflection seismic method.
2. This method is based ___ the measurement ___ variations ___ the magnetic field due ___ changes ___ structure or magnetic susceptibility ___ the rocks.
3. Exploration seismology is divided ___ two branches.
4. Magnetic surveys are usually carried ___ from the air or ___ a ship.
5. The seismic waves are picked up ___ detectors.
6. The concept is the same ___ both surveys.
7. The seismic waves result ___ the downward propagation.
8. The three basic methods are used ___ petroleum exploration.
9. Gravity surveys are carried out ___ land, ___ the air ___ helicopters, and ___ sea ___ ships.
13.4. Fill in the gaps using the terms from the text.
1. The three principle geophysical methods used in petroleum exploration are ____________and ______________.
2. The ____________ method is the oldest one.
3. Today, magnetic surveys for hydrocarbon exploration are usually carried out from __________or from ______________.
4. Exploration seismology is divided into the branches of _________ and ______________.
5. A central recording unit digitizes the _________ __________.
13.5. Control questions.
1. What are three geophysical methods mostly used in oil exploration?
2. Which of the methods is based on the measurement of variations in the magnetic field due to changes of structure?
3. Which of the three methods is the oldest one?
4. Which of the methods is used everywhere: on land, in the air and on ships?
5. Which of the three methods is most widely used?
6. What is gravity method based on?
7. What two branches of exploration seismology do you know?
8. Which of the methods is most frequently used for petroleum exploration?
9. How does reflection seismology work?
10. What fundamental concept is reflection seismic method based on?
11. What are the differences and features in common for land and marine eflection seismic method?