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