42. What is the Oil Window? a. The section of reservoir rock which holds oil b.

Question

42. What is the Oil Window? a. The section of reservoir rock which holds oil b. The depths on a well log corresponding to reservoir boundaries c. The depth interval and corresponding temperatures where a source rock generates oil d. The depth interval where a source rock is immature e. None of the above 3. What are well cuttings? a. Cylinders of rock extracted ahead of drill bit location b. Small samples extracted from the wellbore wall with side core tools c. Rock fragments produced as the drill bit advances d. Geologic samples of rock adjacent to a well location e. None of the above 4. Which of the following well logs can be utilized to distinguish a sandstone from a shale? a. Caliper b. Sonic c. Resistivity d. Gamma ray e. None of the above 45. What is an unconformity? a. An irregular boundary between rock layers at depth b. A buried erosional surface c. Sedimentary rocks adjacent to a fault d. Unusual igneous rocks intruding sedimentary layers e. None of the above 46. Resistivity well logs can detect hydrocarbons in reservoir pore spaces because: a. Hydrocarbons have a higher resistivity than formation waters b. Hydrocarbons have a lower resistivity than formation waters c. Resistivity measurements are not impacted by drilling fluids d. Sandstone oil reservoirs generally have low resistivity e. None of the above

Explanation / Answer

42) C-The depth interval and corresponding temperature where source rock generates oil and expelled out from the source rock.

43) B- Well cuttings are the small samples extracted from the wellbore wall with side core tools.

44) D- gamma ray looging helps to differentiate sandstone and shale.

45) B- A buried erosional surface which seperate the two different rock masses belong to two different ages.

46)A- Hydrocarbon have a higher resistivity than formation water.

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