Answer the following 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 reflection seismic method?