Concept:Petroleum is formed and stored in sedimentary rocks.
Explanation:Petroleum originates from the remains of dead marine organisms such as plankton and algae.
These remains settle on the seafloor and get buried under successive layers of sediment.
Over millions of years, high temperature and pressure convert the trapped organic matter into crude oil and natural gas.
Sedimentary rocks, such as sandstone and limestone, are porous and permeable.
These properties allow oil and gas to move through and collect in pore spaces, forming petroleum reservoirs.
Igneous and metamorphic rocks lack the necessary porosity and organic-rich source beds for petroleum accumulation.
Therefore, petroleum is usually associated with sedimentary basins.
Answer:D. sedimentary rocks