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OIL EXPLORATION METHOD (SEISMIC METHOD (SEISMOGRAPH (to measure the…
OIL EXPLORATION METHOD
MAGNETIC METHOD
MAGNETOMETER(total magnetic over a large field area)
to measure strength of earth magnetic field
show the kinds of rock lying underground
conducting magnetic survey
prospector can determine where oil-bearing sedimentary rock is more likely to be found
Transmit data to device on board
-records the info onto paper/magnetic tape
magnetometer towed behind a ship to cover large areas
micro magnetic technique
development of air bone magnetics
airplane tows a micro magnetometer from low altitude(300ft above ground)
detects micro magnetic anomalies/deviations from norm
geologist use the data to predict the characteristics of overlying sediments
SEISMIC METHOD
SEISMOGRAPH
to measure the vibrations in the earth
to measure vibrations generated by vibrations truck
vibrations travel through different layers of rock
it shows types of structure&density of rock
shows shapes of rock lying undeground
give more precise details on the formations beneath surface
sound waves travel underground at velocities of 2-4 miles/s (3-6km/s).
-depends on type of rock
1) Air gun explodes
4) Digitally record
3) Geophones received reflections
5) Data then interpreted to map various geological formations
2) Generate sound signals
GRAVITY METHOD
geophysicists measure variations in force of gravity from rocks
to few miles beneath the earth's surface
Denser rocks have greater gravitational attraction
GRAVITOMETER
to measure pull of earth gravity
could measure different gravity between porous&non-porous rocks