Is a civil or chemical engineering program better for becoming a petroleum engineer?

Hi Abhishek, the answer is it depends--it depends on what you'd like to do your day-to-day job.  You can get actually get a degree in Petroleum Engineering.  Petroleum Engineers typically design, develop, or help operate oil and natural gas wells to remove these material from the ground.  Civil engineers typically design and build things like structures, roads, bridges, airport, water treatment plants, chemical plants, etc. Chemical engineers typically operate units such as refineries, chemical plants, plastic plants, food production plants, cosmetic plants, etc.  All three of these types of engineer would be very involved in safety, environmental, and sustainability,  So you would work in the petroleum field with any of these degrees, each in slightly different ways.