The remaining solid material, known as spent shale or retort residue, is generally disposed of in surface piles, although research into its secondary uses is ongoing. The generated oil and gas are then pumped to the surface through adjacent production wells.
Global Oil Shale Reserves Overview: Assessing the World's Potential
Furthermore, the carbon footprint of oil shale is generally higher than that of conventional oil, due to the energy needed for mining and conversion. Extraction and Conversion Technologies Extracting oil from shale is fundamentally different from conventional drilling, as the rock itself is the source material rather than a permeable medium holding fluid.
In-situ methods, conversely, drill wells into the formation and use electrical heating or injected fluids to cook the shale while it remains underground, aiming to reduce surface disturbance and logistical challenges. Over millions of years, these deposits were buried under layers of sediment, and the absence of oxygen prevented complete decomposition.
Global Oil Shale Reserves Overview
In-Situ Conversion Processes In-situ technologies aim to reduce the environmental footprint associated with mining by avoiding the removal of rock. The most common technology utilizes a rotating kiln, where the rock is heated to temperatures between 480°C and 520°C.
More About Oil shale
Looking at Oil shale from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Oil shale can make the topic easier to follow by connecting earlier points with a few simple takeaways.
