Question

This is seismic data processing course.

Explains the following:

1. Seismic wave velocity can estimated from seismic data by knowing offsets and arrival time at zero offset.?

2. Seismic wavelet attenuates high frequencies in the reflectivity series?

Answer 1

1. Let us consider V be the wave velocity, X be the offset distance and t be the arrival time at offset distance X and also consider T be the zero offset arrival time

Now we know the formal move out the formula as follow

( t- T) = X2/ 2V2T

Or, V =square root[ X2/ 2(t-T)T]

Therefore Seismic wave velocity can estimated from seismic data by knowing offsets and arrival time at zero offset

2. Seismic wavelet attenuates high frequencies in the reflectivity series because

We know that the attenuation of the seismic wave is given by the following equation

                        A = A0 eπrf/Qv

Where A = present amplitude of the seismic wave

            A0 = Initial amplitude of seismic wave

            Q = quality factor

             . r = distance

              V = velocity

             . f = frequency of seismic wave

Thefore as frequency increases,amplitude decreases. It implies that Seismic wavelet attenuates high frequencies