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offshore prospecting click to hear : offshore prospecting

Vibrations from an exploding charge in the sea are used to locate oil deposits; prospecting offshore is more difficult than on land.
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See offshore prospecting in : french | spanish
petroleum trap blasting charge seismographic recording shock wave

petroleum trap click to hear : petroleum trap

Assemblage of porous rocks that contain recoverable oil reserves, which are produced from marine or land deposits.

blasting charge click to hear : blasting charge

Quantity of explosives (substances capable of discharging high-temperature gases over a very short time period) that produce shock waves when detonated.

seismographic recording click to hear : seismographic recording

A recording made using an apparatus called a seismograph; the analysis of its shock wave echoes detects the presence of rock layers that might contain pockets of petroleum or gas.

shock wave click to hear : shock wave

The shock wave spreads and sends back an echo, which varies with the density and depth of the layers of subsoil; with this information, the composition of the subsoil can be determined.