Unconventional sources of petroleum such as oil sands and shale are often grouped together and referred to as:

Name: Unconventional sources of petroleum such as oil sands and shale are often grouped together and referred to as:
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Oil sands and shale are considered unconventional sources of petroleum and are commonly referred to as "heavy oil" due to their dense and viscous nature, which makes extraction and processing more complex and costly compared to conventional oil sources.

Unconventional Sources of Petroleum Such as Oil Sands and Shale