About This Item
Share This Item
Oil shale resources in the United States are important as an energy source. Knowledge of the mechanical properties, including the creep behavior, is essential to any form of development. The creep behavior of oil shale samples taken from the Parachute Creek Member of the Green River Formation has been studied. A pneumatic-driven testing machine with long-term displacement monitors was used. The set of duplicate test specimens required for creep testing were cut from the same horizon of oil shale using a diamond-impregnated-wire saw to avoid surface damage. Duplicate samples were tested at various stress levels of the ultimate compressive strength. Samples with different organic contents were taken at different depths of the core. A nonlinear rheological model was develope and a multi-parametric statistical analysis was performed. It was concluded that the organic content and the stress levels were important parameters. The creep phenomenon can be represented by a nonlinear strain-time equation upon which a nonlinear pseudo 3-D creep model can be built, relating the strains to the stresses.
End_of_Article - Last_Page 962------------