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