ment where iron exists in the reduced or ferrous state? a. dark green color o. W
ID: 120780 • Letter: M
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ment where iron exists in the reduced or ferrous state? a. dark green color o. Which of the following is an indication that sediments accumulated in an oxygen poren b. reddish color c. brown color color is not related to oxygen content in accumulating sediments d. the axis of an anticline A line is drawn on a geological map across and perpendicular to from the axis of the anticline 7. a sectn. Wat would you observe moving along this line on the surface away a. there would be no change in rock type along the line b. rock layers defined by contacts would be progressively older c. rock layers defined by contacts would be progressively younger d. none of the above S.aThe porous andemeable rock where commercial volumes of hydrocarbons accumulate 8· at depth is called the? a. reservoir b. trap c. source d. seal 9. Which o the following applies to the formation of oil at depth? a. oil may form at any depth b. oil formation requires temperatures50o c c. oil forms within a specific depth and temperature window d. none of the above 10. What is the general relationship between depth of burial and porosity for sediments deposited in a basin? a. porosity increases with depth of burial b. porosity decreases with depth of burial c. There is norelationship between depth of burial and porosity d. none of the above 11. A limestone layer at depth has a maximum (vertical) principal stress of 250 kN/m2 and a maximum shear stress of 60 kN/m2. What is the minimum principal stress? a. 190 kN/m2 b. 310 kN/m2 c. 130 kN/m2 d. 60 kN/m2Explanation / Answer
6.(b)Redish colour- Banded iron formation are being formed where atmosphere would have been very poor in free oxygen. banded iron formation consists of repeated, thin layers (a few millimeters to a few centimeters in thickness) of silver to black iron oxides, either magnetite (Fe3O4) or hematite (Fe2O3), alternating with bands of iron-poor shales and cherts, often red in color, of similar thickness, and containing microbands (sub-millimeter) of iron oxides.
7. (c). Rock layer defined by contact would ne progressively younger because in anticline upper bed is always younger but their is no deformation.
8. (b). Hydrocarbon traps form where permeable reservoir rocks (carbonates, sandstones) are covered by rocks with low permeability (caprocks) that are capable of preventing the hydrocarbons from further upward migration. Typical caprocks are compacted shales, evaporites, and tightly cemented sandstones and carbonate rocks.
9.(c). Oil formed within a specific depth and tempreture window- Hydrocarbon traps form where permeable reservoir rocks (carbonates, sandstones) are covered by rocks with low permeability (caprocks) that are capable of preventing the hydrocarbons from further upward migration. Typical caprocks are compacted shales, evaporites, and tightly cemented sandstones and carbonate rocks.
10.(b) porosity decreases with depths of burial - Porosity decreases with depth in sedimentary basins, because its high pressure grain to grain contact is squeezed.
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