An important reason that sedimentary rocks are economical is that they are porous and permeable. Natural gas, for example, collects in the pore spaces between the sediment grains within these rocks. Porosity is the amount of space between the grains within a rock. It can be quantified as the total volume of space between grains divided by the volume of grains. A low porosity means that there is little space, and a high porosity means that there is a lot of space. -Permeability is how much the pore spaces are connected. Fluid flows through rocks that are more permeable.
The image below is an illustration of two different rocks. These images are magnified to show the individual grains (dark gray) and pore spaces (light gray) that make up the rock. Study these images and select the statement that describes the correct comparison of the porosity and permeability of these two rocks.
A.) Rock A has a lower porosity and a lower permeability than Rock B.
B.) Rock A has a higher porosity and a lower permeability than Rock B.
C.) Rock A has a lower porosity and a higher permeability than Rock B.
D.) Rock A has a higher porosity and a higher permeability than Rock B.
Answer: A.) Rock A has a lower porosity and a lower permeability than Rock B.
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