Definition

Noun: - A type of sedimentary rock: Oil shale is a fine-grained sedimentary rock containing significant amounts of kerogen, a solid mixture of organic chemical compounds. When heated to high temperatures, this kerogen can be converted into a synthetic crude oil.

Usage

• Oil shale is a source of unconventional oil.
• The primary commercial interest in oil shale lies in its potential to produce liquid hydrocarbons through a process called retorting.
• It is distinct from "shale oil," which refers to oil trapped within shale formations that can be extracted by methods like hydraulic fracturing.

Examples

• Noun:
  • The country has vast reserves of oil shale.
  • Extracting oil from oil shale is an energy-intensive process.
  • The geology class studied the composition of oil shale samples.

Advanced Usage

• "Oil shale deposits": Refers to the geological formations where this rock is found.
  • The Green River Formation in the western United States contains some of the world's largest oil shale deposits.
• "Oil shale retorting": The specific industrial process of heating oil shale to release hydrocarbons.
  • The company invested in new technology for more efficient oil shale retorting.

Variants and Related Words

• Kerogen (n): The solid organic material within oil shale that yields oil upon heating.
• Shale oil (n): This is a related but distinct term referring to light crude oil trapped in shale rock formations, typically extracted via fracking, not from heating the rock itself.
• Retort (n/v): A vessel or process for heating substances, like oil shale, to separate their components.

Synonyms

• Kerogen shale: A more technical synonym emphasizing the key component.
• Bituminous shale: An older or less precise term sometimes used.

Notes on Meaning

• The term oil shale specifically refers to the itself, not the extracted liquid. The liquid product is called "shale oil" or "synthetic crude."
• It is an unconventional energy resource, meaning it is not extracted using traditional oil well methods.

Noun

1. shale from which oil can be obtained by heating