The formations within the basin are significant producers of petroleum and natural gas.

The three fossil fuel types are coal, petroleum and natural gas.

The area has considerable natural resources in the form of petroleum and natural gas.

Rock strata beneath the ocean floor are an important source of petroleum and natural gas.

The sea has many resources of petroleum and natural gas.

China's pipelines carried 219.9 million tons of petroleum and natural gas in 2003.

Residential users of petroleum and natural gas are exempt from the tax.

Even though it produces significant quantities of petroleum and natural gas, poverty is still a concern.

Liaoning is also an important source of petroleum and natural gas.

Russia wants to sell its large reserves of petroleum and natural gas.