Quiz 1 answer - Kaolinite and Smectite. The ratio of Si:Al...

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Quiz 1 PGE 424 Name: 10 points 15 min 1. What are the 3 types of rocks? Which one is important to petroleum engineering? Why? Igneous, sedimentary, metamorphic. Sedimentary is the most important because it has porosity and can hold hydrocarbons. 2. What is a “Fluvial Deposit”? Sediments in river beds 3. A reservoir is about 5000 ft deep. What would be an approximate net overburden stress at this depth? Roughly 0.567 psi/ft. Stress= 5000x0.567= 2835 psi 4. What is “dolomitization”? CaCO3 getting converted to CaMgCO3. It create pore space because the latter is more dense than the former. 5. What is an “argillaceous sandstone”? Sandstone with sand and clays 6. Name 2 common clays. How are they different?
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Unformatted text preview: Kaolinite and Smectite. The ratio of Si:Al = 1:1 in Kaolinite and 2:1 in Smectite. 7. What is effective porosity? Porosity that is connected to outside (not isolated). 8. For sandstones, what does porosity depend mostly on? Grain size distribution, clay content, extent of compaction 9. What is a common method to measure porosity? Boyles law (or pressure chamber) method (give partial credit for: fluid summation, solvent extraction, mercury inj, picnometer, immersion) 10. What is the difference between “accuracy” and “precision”? Accuracy: measure of closeness to true value. Precision: Measure of variation between several measurements (without reference to true value)...
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This note was uploaded on 10/11/2009 for the course PGE 19460 taught by Professor Sharma during the Spring '09 term at University of Texas.

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