5. Geophysics and Remote Sensing

Seismic Methods — Quiz

Test your understanding of seismic methods with 5 practice questions.

Practice Questions

Question 1

Which petrophysical property most directly influences the P-wave velocity of a rock?

Question 2

A seismic reflection at normal incidence occurs at an interface between layer 1 with $\rho_1=2000\,\mathrm{kg/m^3}$ and $v_1=2000\,\mathrm{m/s}$, and layer 2 with $\rho_2=2500\,\mathrm{kg/m^3}$ and $v_2=3000\,\mathrm{m/s}$. What is the reflection coefficient $R=\frac{Z_2 - Z_1}{Z_2 + Z_1}$?

Question 3

In a seismic reflection survey, a two-way travel time of $0.8\,\mathrm{s}$ is recorded for a horizontal reflector. If the average seismic velocity is $2000\,\mathrm{m/s}$, what is the depth to the reflector?

Question 4

For a common midpoint gather, the travel time at offset $x$ obeys $t^2 = t_0^2 + \frac{x^2}{v^2}$. If $t_0=0.5\,\mathrm{s}$, $x=600\,\mathrm{m}$, and $v=2500\,\mathrm{m/s}$, what is the normal moveout correction $\Delta t = t - t_0$ approximately?

Question 5

The vertical resolution $R$ of a seismic reflection system is approximately $R=\frac{v}{4f}$. What is $R$ for $v=3000\,\mathrm{m/s}$ and $f=30\,\mathrm{Hz}$?