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Text 1. Locating Oil
PART I. TEXTS AND EXERCISES
UNIT I. OIL AND GAS
Text 1. Locating Oil
The task of finding oil is assigned to geologists, whether employed directly by an oil company or under contract from a private firm. Their task is to find the right conditions for an oil trap - the right source rock, reservoir rock and entrapment. Many years ago, geologists interpreted surface features, surface rock and soil types, and perhaps some small core samples obtained by shallow drilling. Modern oil geologists also examine surface rocks and terrain, with the additional help of satellite images. However, they also use a variety of other methods to find oil. They can use sensitive gravity meters to measure tiny changes in the Earth's gravitational field that could indicate flowing oil, as well as sensitive magnetometers to measure tiny changes in the Earth's magnetic field caused by flowing oil. They can detect the smell of hydrocarbons using sensitive electronic noses called sniffers. Finally, and most commonly, they use seismology, creating shock waves that pass through hidden rock layers and interpreting the waves that are reflected back to the surface.
 Searching for oil over water using seismology
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In seismic surveys, a shock wave is created by the following:
Compressed-air gun - shoots pulses of air into the water (for exploration over water)
Thumper truck - slams heavy plates into the ground (for exploration over land)
Explosives - drilled into the ground (for exploration over land) or thrown overboard (for exploration over water), and detonated
The shock waves travel beneath the surface of the Earth and are reflected back by the various rock layers. The reflections travel at different speeds depending upon the type or density of rock layers through which they must pass. The reflections of the shock waves are detected by sensitive microphones or vibration detectors -- hydrophones over water, seismometers over land. The readings are interpreted by seismologists for signs of oil and gas traps.
Although modern oil-exploration methods are better than previous ones, they still may have only a 10-percent success rate for finding new oil fields. Once a prospective oil strike is found, the location is marked by GPS coordinates on land or by marker buoys on water.
Words to know:
1. Oil trap
2. Source rock
3. Entrapment
4. Terrain
5. Shock wave
6. Oil strike
7. Buoy
8. Rock layer
9. Thumper truck
10. Meter
Exercise 1. Explain the meaning of the following words:
Reservoir rock, GPS, shallow drilling, satellite image