This report describes the first five tests in a series of tests simulating zones of contrasting permeability in in-situ retorts. The objective of this series of tests is to determine the yield loss from retorting of oil shale beds with zones of contrasting flow resistance. The contrasting flow resistance is simulated by loading a cylindrical core with oil shale particles of one size range, while filling the annular space around the core with a different size range of oil shale particles. Tracer and temperature data are used to measure the flow characteristics and thermal front shapes within the bed. Examples of data summaries and preliminary evaluations are described to show some of the techniques used to develop possible relationships between oil yield and permeability contrast. A correlation between permeability ratio and oil yield shows promise as a blast design and yield prediction tool. Indications that oil yield loss from cracking and combustion may be related to permeability contrast needs confirmation. Shapes of retorting fronts were used for qualitative assessment of oil yield. 13 refs., 7 figs., 6 tabs.
