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Cairo UniversityFaculty of EngineeringPetroleum Department

Petroleum Exploration

Seismic Survey(Seismic Reflection Methods)Dr. Abdul-Aziz Mohammed Abdul-

Aziz

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- Seismic receiver for land are sometime called velocityphones since they are sensitive to the velocity at which

particles are displaced.- Seismic receiver for marine, called pressure sensitivephones.- Velocity phones are also known as:- geophones, jugs,seises, seisphones, seismometers, and sensors- Marine pressures transducers are also calledhydrophones, water phone, crystal phones, and pressurephones.

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Land Cables- The total system of geophones and cable is

sometimes called the spread. The land cableusually consisting of 96 or 120 channels.

- They may be long continuous sections, but mostof the time are produced in short sections for

ease of handling and replacement of faultyportions.- Usually more geophone groups and cables areactually laid out, then the recorded channels areswitched at the instruments in rollalong fashion

and the cable/group combinations are movedfrom the end of the line to the front for later use in

recording.

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- Main purpose of an array is to attenuatehorizontally traveling noise Ground Roll, andincrease the signal by boosting the almostvertically propagating seismic signal torecordable levels, the signal-to-random noise

ratio improved by N, where N is the number ofreceivers from one group. Multiple receiversare also advantageous in that if oneseismometer prove faulty, a trace will not be

completely killed.

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