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7. For a reflection seismic survey, where the subsurface has an average P-wave velocity of 1000m/s and we use a 10ms seismic wavelet, the best resolution we could obtain is? a. 1 m b. 2.5 m с. 5m d. 10 m 8. Seismic migration can be best described as a. Converting the seismic section from time to depth b. Adjusting the reflection time based on the hyperbolic travel time c. Stacking the traces d. Putting seismic reflectors in their correct location 9. In a seismic survey, an air wave can be best described as a. A wave that travels through the air b. A compression wave that travels through the air in the pore spaces in the rock. c. A direct, compression wave that travels from the source to the geophones through the air. d. All of the above 10. A seismic survey is conducted in a region with two layers. The top layer is shale, with density 2500 kg/m3, and seismic velocity of 2900m/s, and the bottom layer is sandstone, with a density of 2100 kg/m3, and a seismic velocity of 3000m/s. The reflection coefficient will be a. Positive b. Negative c. Zero d. Not enough information 11. A seismic survey is set-up with a source in a borehole, 100m below the surface, and an array of geophones on the surface. There is an interface at 200m. The top layer has velocity 1000m/s and the lower layer has velocity 2000m/s. Which of the following characteristics on a T-X plot will remain the same if the source was now moved to the surface? a. Slope of the refracted arrivals b. Intercept times of the refracted arrivals c. Arrival times of the direct ray d. Arrival times of the reflections 12. When looking at first arrival times in a seismic refraction survey, what relationship between the layer velocities allow us to determine the velocity of layer 3 and know that it is in fact the velocity for layer 3? a. V1 < V2 < V3 b. V2 < V1 < V3 c. as long as V2 > V3 d. VI>V2

7. For a reflection seismic survey, where the subsurface has an average P-wave velocity of 1000m/s and we use a 10ms seismic wavelet, the best resolution we could obtain is? a. 1 m b. 2.5 m с. 5m d. 10 m 8. Seismic migration can be best described as a. Converting the seismic section from time to depth b. Adjusting the reflection time based on the hyperbolic travel time c. Stacking the traces d. Putting seismic reflectors in their correct location 9. In a seismic survey, an air wave can be best described as a. A wave that travels through the air b. A compression wave that travels through the air in the pore spaces in the rock. c. A direct, compression wave that travels from the source to the geophones through the air. d. All of the above 10. A seismic survey is conducted in a region with two layers. The top layer is shale, with density 2500 kg/m3, and seismic velocity of 2900m/s, and the bottom layer is sandstone, with a density of 2100 kg/m3, and a seismic velocity of 3000m/s. The reflection coefficient will be a. Positive b. Negative c. Zero d. Not enough information 11. A seismic survey is set-up with a source in a borehole, 100m below the surface, and an array of geophones on the surface. There is an interface at 200m. The top layer has velocity 1000m/s and the lower layer has velocity 2000m/s. Which of the following characteristics on a T-X plot will remain the same if the source was now moved to the surface? a. Slope of the refracted arrivals b. Intercept times of the refracted arrivals c. Arrival times of the direct ray d. Arrival times of the reflections 12. When looking at first arrival times in a seismic refraction survey, what relationship between the layer velocities allow us to determine the velocity of layer 3 and know that it is in fact the velocity for layer 3? a. V1 < V2 < V3 b. V2 < V1 < V3 c. as long as V2 > V3 d. VI>V2

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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7. For a reflection seismic survey, where the subsurface has an average P-wave velocity of 1000m/s and we use a 10ms seismic wavelet, the best resolution we could obtain is? a. 1 m b. 2.5 m с. 5m d. 10 m 8. Seismic migration can be best described as a. Converting the seismic section from time to depth b. Adjusting the reflection time based on the hyperbolic travel time c. Stacking the traces d. Putting seismic reflectors in their correct location 9. In a seismic survey, an air wave can be best described as a. A wave that travels through the air b. A compression wave that travels through the air in the pore spaces in the rock. c. A direct, compression wave that travels from the source to the geophones through the air. d. All of the above 10. A seismic survey is conducted in a region with two layers. The top layer is shale, with density 2500 kg/m3, and seismic velocity of 2900m/s, and the bottom layer is sandstone, with a density of 2100 kg/m3, and a seismic velocity of 3000m/s. The reflection coefficient will be a. Positive b. Negative c. Zero d. Not enough information 11. A seismic survey is set-up with a source in a borehole, 100m below the surface, and an array of geophones on the surface. There is an interface at 200m. The top layer has velocity 1000m/s and the lower layer has velocity 2000m/s. Which of the following characteristics on a T-X plot will remain the same if the source was now moved to the surface? a. Slope of the refracted arrivals b. Intercept times of the refracted arrivals c. Arrival times of the direct ray d. Arrival times of the reflections 12. When looking at first arrival times in a seismic refraction survey, what relationship between the layer velocities allow us to determine the velocity of layer 3 and know that it is in fact the velocity for layer 3? a. V1 < V2 < V3 b. V2 < V1 < V3 c. as long as V2 > V3 d. V1>V2<V3 13. Which of the following statements about Snell's law in the context of a seismic survey is incorrect? Snells law: sin e, V1 %3D V2 sin 8, Here, 01 is the incidence angle and 02 is the transmission angle. a. Snell's law shows the angular relationship between the incident and transmitted waves at the interface in terms of velocities b. The angle of reflection can be different from the angle of incidence c. When a seismic wave travels from a region of low velocity to high velocity, the wave is refracted away from the normal vector of the interface d. When 02-90 degree, a head wave develops due to critical refraction 14. Which of these elastic moduli describes the ratio between volumetric stress and volumetric strain? a. Young's Modulus b. Shear Modulus с. Bulk Modulus
Transcribed Image Text:7. For a reflection seismic survey, where the subsurface has an average P-wave velocity of 1000m/s and we use a 10ms seismic wavelet, the best resolution we could obtain is? a. 1 m b. 2.5 m с. 5m d. 10 m 8. Seismic migration can be best described as a. Converting the seismic section from time to depth b. Adjusting the reflection time based on the hyperbolic travel time c. Stacking the traces d. Putting seismic reflectors in their correct location 9. In a seismic survey, an air wave can be best described as a. A wave that travels through the air b. A compression wave that travels through the air in the pore spaces in the rock. c. A direct, compression wave that travels from the source to the geophones through the air. d. All of the above 10. A seismic survey is conducted in a region with two layers. The top layer is shale, with density 2500 kg/m3, and seismic velocity of 2900m/s, and the bottom layer is sandstone, with a density of 2100 kg/m3, and a seismic velocity of 3000m/s. The reflection coefficient will be a. Positive b. Negative c. Zero d. Not enough information 11. A seismic survey is set-up with a source in a borehole, 100m below the surface, and an array of geophones on the surface. There is an interface at 200m. The top layer has velocity 1000m/s and the lower layer has velocity 2000m/s. Which of the following characteristics on a T-X plot will remain the same if the source was now moved to the surface? a. Slope of the refracted arrivals b. Intercept times of the refracted arrivals c. Arrival times of the direct ray d. Arrival times of the reflections 12. When looking at first arrival times in a seismic refraction survey, what relationship between the layer velocities allow us to determine the velocity of layer 3 and know that it is in fact the velocity for layer 3? a. V1 < V2 < V3 b. V2 < V1 < V3 c. as long as V2 > V3 d. V1>V2<V3 13. Which of the following statements about Snell's law in the context of a seismic survey is incorrect? Snells law: sin e, V1 %3D V2 sin 8, Here, 01 is the incidence angle and 02 is the transmission angle. a. Snell's law shows the angular relationship between the incident and transmitted waves at the interface in terms of velocities b. The angle of reflection can be different from the angle of incidence c. When a seismic wave travels from a region of low velocity to high velocity, the wave is refracted away from the normal vector of the interface d. When 02-90 degree, a head wave develops due to critical refraction 14. Which of these elastic moduli describes the ratio between volumetric stress and volumetric strain? a. Young's Modulus b. Shear Modulus с. Bulk Modulus
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