Which of the following sites is the least common place in which oil is trapped?
A) the flanks of a salt dome
B) the upper part of a lens of permeable rock
C) the top of an anticline
D) the bottom of a syncline

Question

Quizplus · Accepted Answer

Oil, being less dense than water, tends to migrate upwards through permeable rock until it is trapped by an impermeable layer. The bottom of a syncline, being a downward-curving layer of rock, is the least likely place for oil to accumulate since oil would move away from this low point towards higher structural traps like the flanks of a salt dome, the upper part of a lens of permeable rock, or the top of an anticline.

Which of the Following Sites Is the Least Common Place