13 of 20 Question 13

Item 13
For the diagram below, assume fracking has not been used with the oil and gas well.

The figure presents a diagram of 6 rock layers that contain oil and natural gas. Beginning at the bottom and moving upwards, the rock layers are as follows. Rock layer D is at the bottom, and rock layer C is directly above it. Oil is located in the upper portion of rock layer C, and natural gas, or C H 4, is located directly above the oil, still in rock layer C. Rock layer B is located directly above rock layer C, and it contains the same type of rock as layer D. Moving upward, the next two rock layers are unlabeled. Rock layer A lies at the top, and it contains the same type of rock as layers B and D. A well has been drilled down into the area of natural gas, or C H 4.

Rock layer that can be porous but must have very low to no permeability