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10.State whether the following sentences are True or False; correct the false ones.

1. Less dense rocks have greater gravitational attraction than denser rocks.

2. Reflection seismic method is the oldest one.

3. Gravity method is based on the measurement of magnetic field due to changes of structure and gravitational susceptibility of the rocks.

4. The technology of collecting and processing reflection seismic data is based on the concept, that seismic energy generates and penetrates the earth’s surface.

5. At sea, seismic energy is generated at or near the earth’s surface by arrays of small chemical explosions.

6. Magnetic surveys are usually carried out from a ship and from the air.

11. Reconstruct the jumbled sentences.

1) unit\ is\to\ the data\ transmitted\ central\ a\ recording.

2) defined\ gravitational\ is\ the density\ by\ of\ attraction\ rocks.

3) array \ in \of \ marine\ is actuated\ survey\ air guns.

4) the seismic\ propagation\ are\ energy\ of downward\ waves\ result\ of the source.

5) is based on\ seismology\ subsurface \of arrival times\ reflection\ measurements/ reflected from\ of events\ interfaces.

6) digitizes\ a central \ subsequent\ and\ analog\ records\ unit\ them\ for\ recording\ analysis\ signals.

7) denser rocks\ as an anomaly\ map\ uplift of\ will be shown\ a structural\ on gravity.

8) energy\ devices\ arrays of\ can be\ chemical\ seismic\ generated\ explosion\ by\ thumping\ or.

    1. 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. Describe the differences and features in common for land and marine reflection seismic method.

13. 9 Listen to Khoi Pham who works for Geophysical Service Incorporated (gsi). He tells about his position as a crew manager in marine survey. Answer the given below questions.

  1. What are his responsibilities in this position?

  2. What opportunities are there for the promotion?

  3. What does the job of an observer include?

  4. What skills should an observer have?

  5. Why does he like the job?

  6. What is his schedule like?

  7. How does he spend his free time?

  8. What are his personal accomplishments connected with the job?

14.Tell about how to find oil using the following pictures.

  1. In ancient times

  2. In the 19th century

  3. Today

    1. Map

    2. Hammer

    3. Acids

    4. Magnifying glass

    5. Logbook

  1. Aerial shot.

  2. Satellite shot

  1. vibrator truck

  2. receivers

  3. laboratory truck

  1. Seismic vessel

  2. receivers

  1. Isochrons

  2. 3D seismic Maps

  1. Geophysicist

  2. Geologist

  1. Drilling location

  1. Well casing

  2. Cable retaining the downhole probe

  3. Downhole Probe

  4. First probe sensor

  5. Second probe sensor

  6. Third probe sensor

  7. Measurements obtained by the sensors

  1. Coring tool

  2. Core sample

  3. Indications concerning height of beds

  4. Clues concerning type of rock

  1. One hole in five struck oil

  1. Economic data

  2. Choice of operating methods

  3. Geological data

ELF Aquitaine Geophysical Prospecting:  How to find oil!

http://www.mssu.edu/SEG-VM/introduction_to_geophysical_prospecting.html

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