You searched for: “kerogen”
kerogen (s) (noun), kerogens (pl)
A complex fossilized organic material that exists in sedimentary rock and which is insoluble in organic solvents: "Kerogen yields petroleum products; such as, oil and natural gas, when it is distilled."
This entry is located in the following units: cero-, cer-, kero-, keri- (page 3) Fracking, Hydro Fracking, Hydraulic Fracturing Content Entries (page 1)