Question

Petroleum is found in ______
A. Sedimentary rocks
B. Metamorphic rocks
C. Igneous rocks
D. None of the above

Answer 1

Hint: It is found in the rock having a rich amount of kerogen . It occurs in any type of porous rocks.It is formed by volcanism,impacts and some minor processes.

Complete answer:
Sedimentary rocks are formed when an amount of organic matter ,minerals,rocks are found and accumulated. In Sedimentary rocks large quantities of zooplankton and algae are found buried under these rocks and due to Intense heat and pressure Petroleum is formed .
Now let’s see the options-
Sedimentary rocks :- Sedimentary rocks are formed by accumulation of minerals, organic matter, these are of three types Clastic , Carbonate and evaporitic. Petroleum is formed by the substances buried under the rocks. Sandstone and limestone are good reservoir rocks for petroleum and natural gas hence it is a correct option.
Metamorphic rocks :- Metamorphic sustainably change from igneous , sedimentary and other metamorphic forms. These rocks formed under high pressure and heat, these rocks do not melt but transform into compact forms.some common substances found in these rocks are quartzite, marble,etc. Hence it is an incorrect option.
Igneous rocks :- Igneous rocks formed by the cooling and solidification of hot molten rocks. These rocks are of two types:- Extrusive(on the surface of earth from lava) and intrusive(within the crust of the earth when magma cools and solidifies). These rocks contain silicate minerals like quartz,Micas,etc. Hence it is an incorrect option.
None of the Above- As option A)Sedimentary rocks is the right answer hence this is incorrect.

Therefore the correct answer is A.

Note: Shale is the most efficient sedimentary rock because of its composition(42% in sedimentary rocks). Petroleum engineering is expected to grow by a good rate in upcoming years and the employment in this sector can grow as expected growth rate.