The best replacement for shale oil is oil shale.

The best alternatives to shale oil are rated as following:
★★★★★  oil shale
★★★  shale gas
★★  crude oil
★  tight oil
★  oil sands
  conventional oil

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No companions for shale oil have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of shale oil in all years. Click on graph for more.
shale oil
oil shale
shale gas