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The seismic survey is a part of the training for the IFP school students.
The students record a small seismic line (100 m length). The source is a weight dropper.
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Step 1: Seismic source
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Step 2: Seismic spread.
The seismic line is composed of 48 geophones, 2 m apart. The receiver spread is fixed. The source
moves and shoots between 2 adjacent geophones.
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Step 3: Field data-example of a shot point.
It is the field record 212. We can notice the direct and refracted waves, reflected event close to
the refracted wave, the air wave and a pseudo-Rayleigh wave which has a low apparent velocity, a
strong energy and low frequency content. The pseudo Rayleigh wave has an apparent velocity lower than
the apparent velocity of the air wave which has high frequency content.
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Step 4: fold variation.
The parameters of acquisition lead to a fold which varies linearly from 1 at the edges of the receiver
spread to 48 in the central part of the receiver spread. Figure shows the Index Viewer of the seismic line.
It is a table which gives a synthesis of the characteristic parameters. The dotted red curve shows the
variation of the fold along the line.
