Geophysics 559-Geophysical Interpretation
In class midterm will be mostly multiple choice; but there will be also written questions.
Disclaimer: While every reasonable effort is made to ensure that the information provided is accurate, no guarantees for the currency or accuracy of information are made. It takes several proof readings and rewrites to bring the quiz to an exceptional level. If you find an error, please contact me as soon as possible. Please indicate the question ID-Number or description because server may randomize the questions and answers.
Geophysics 559 (GOPH 559) Midterm
Congratulations - you have completed Geophysics 559 (GOPH 559) Midterm.
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Question 1 |
A | Vibrations |
B | Speed or velocity |
C | Density of formations |
D | Depth of reflectors |
Question 2 |
A | Folds |
B | Faults |
C | Foliations |
D | Reefs |
Question 3 |
A | Slab and Terrain effects |
B | Latitude and Free Air effects |
C | Free Air and Slab effects |
D | Free Air and Terrain effects |
E | Latitude and Slab effects |
Question 4 |
A | Increase in seismic frequency. |
B | Increasing spatial sampling. |
C | Decrease in period. |
D | Having a frequency below the Nyquist value. |
Question 5 |
A | Dry gas preservation limit |
B | Oil window |
C | Oil floor |
D | Wet gas preservation limit |
Question 6 |
A | 200 m/s |
B | 4000 m/s |
C | 10 m/s |
D | 6000 m/s |
E | 1500 m/s |
Question 7 |
A | Water |
B | Gas |
C | Oil |
D | Cannot be answered with the given information. |
Question 8 |
A | Reciprocity |
B | Normal Moveout |
C | Convolution |
D | Deconvolution |
Question 9 |
A | Snell's Law |
B | Refraction Law |
C | Fermat's Principle |
D | Principle of Reciprocity |
Question 10 |
A | resolution of layers with extremely small difference in densities. |
B | reduction of seismic resolution as a result of smaller variation in densities of different layers and the depth to the reflection surface. |
C | effect that the distance between a seismic source and a receiver (the offset) has on the arrival time of a reflection. |
D | density contrast between two layers adjacent to each other. |
Question 11 |
A | Porosity |
B | Buoyancy |
C | Gravity |
D | Pressure |
E | Temperature |
Question 12 |
A | 150 degree Celsius |
B | 90 degree Celsius |
C | 50 degree Celsius |
D | 200 degree Celsius |
E | 70 degree Celsius |
Question 13 |
A | A theoretical name given to springs that are not being stretch. |
B | A theoretical name given to springs that obey its spring constant, k. |
C | A theoretical name given to springs that do not obey its spring constant, k. |
D | A spring that is under maximum tension (maximum stretch). |
E | A spring that has no length but only diameter. |
Question 14 |
A | 200 - 350 degree Celsius |
B | 250 - 350 degree Celsius |
C | 50 - 150 degree Celsius |
D | 20 - 200 degree Celsius |
E | 0 - 200 degree Celsius |
Question 15 |
A | Acoustic impedance |
B | Magnetic survey |
C | None of the above |
D | Seismic interference |
E | Gravity survey |
Question 16 |
A | Gas at the very top of the reservoir followed by oil and water as the depth increases. |
B | Oil at the very top of the reservoir followed by gas and water as the depth increases. |
C | A very good reservoir with no significant traps. |
D | A very good reservoir with 100% pure oil and no impurities or other type of fluids. |
Question 17 |
A | less than 5 |
B | greater than 30 |
C | greater than 50 |
D | greater than 10 |
E | less than 40 |
Question 18 |
A | Fractures within the formation. |
B | Change in lithology. |
C | Change in density. |
D | Change in dip angles. |
Question 19 |
A | 50 years. |
B | 150 years. |
C | 20 years. |
D | 100 years. |
Question 20 |
A | ...time (and time only). |
B | ...frequency (and frequency only). |
C | ...similarities between seismic events. |
D | ...wavelength (and wavelength only). |
Question 21 |
A | A body of rock that is capable of containing hydrocarbons due to perfectly impermeable barrier. |
B | A Geologic area that is capable of containing hydrocarbons due to relatively impermeable barrier. |
C | A specific area of a specific Formation in which the temperature is between 50 - 150 degree Celsius. |
D | A highly conductive (high effective porosity) stratigraphic or a rock body that is capable of containing hydrocarbon. |
Question 22 |
A | The location with the highest elevation and the lowest latitude. |
B | The location closest to the poles. |
C | The location closest to the equator. |
D | The location with the lowest elevation and the highest latitude. |
E | The location between the equator and the poles (middle). |
Question 23 |
A | It will be a reduced reading by a factor of 2πGρt. |
B | It will be a increased reading by a factor of 4πGρt. |
C | It will be a increased reading by a factor of 2πGρt. |
D | It will be a reduced reading by a factor of 4πGρt. |
Question 24 |
A | It depends on the rock type and the formation. |
B | Along the plane of the fractures. |
C | Along any angle between the fractures and natural permeability pathways. |
D | Across or perpendicular to fractures. |
Question 25 |
A | 512.2 Hz |
B | 255.8 hz |
C | 322.9 Hz |
D | 166.7 Hz |
Question 26 |
A | Incident and Refractory rays |
B | Spring Constant and magnitude of gravity |
C | Gravitational and Potential energy |
D | Gravitational and Magnetic forces |
Question 27 |
A | high |
B | low |
C | Not enough information to answer the question. |
Question 28 |
A | Igneous rocks |
B | Salt |
C | Limestone |
D | Shale |
E | Sandstone |
Question 29 |
A | Hydrological research (drinking water, fresh water) |
B | Identification of basement features |
C | Mineral exploration |
D | Oil and gas exploration |
Question 30 |
A | Direct wave |
B | Critically refracted arrival |
C | Refracted arrival |
D | Guided wave |
E | Transmitted wave |
Question 31 |
A | Density measurements obtained through seismic data. |
B | Comprehensive understanding of the regional Geology. |
C | Advanced well-logging data obtained through a combination of core samples and seismic data. |
D | 2D and 3D structural modeling of the area. |
Question 32 |
A | The direct wave has a sinusoidal wave form while the head wave does not. |
B | The head wave travels further than the direct wave, but it has a higher velocity. |
C | The head wave only travels in the first medium. |
D | The direct wave travels faster than the head wave. |
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Credits: Based on the excellent class notes provided by, Dr. Laurence Lines during Winter 2015.
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Given the faulted slab equation, , prove that the edge of the buried slab occurs at the inflection point of the gravitational profile curve.