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We measured the dielectric permittivity of dry and fluid saturated Green River oil shale samples over a frequency range of 1 MHz to 1.8 GHz. Dry sample measurements were carried out between room temperature and 146 Â°C; saturated sample measurements were carried out at room temperature. Samples obtained from the Green River formation of Wyoming and from the Anvil Points Mine in Colorado were cored both parallel and perpendicular to layering. The samples, which all had organic richnesses in the range of 0.04âˆ’0.19 L/kg (10âˆ’45 gal/ton), showed small variations between samples and a relatively small level of anisotropy of dielectric properties when dry. The real and imaginary part of the relative dielectric permittivity...