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Miscible Displacement in Saturated and Unsaturated Sandstone¹

ABSTRACT

A description of soil water movement is more complete if the nature of the pore structure is known. Miscible displacement techniques were used to investigate the nature of the pore structure of a sandstone. The mixing of a 75-ml. slug of tritiated CaCl₂ solution during displacement through 5 lengths of sandstone was measured. Different velocities and different degrees of water saturation were involved. Limited mixing by molecular diffusion for the various experimental conditions clearly revealed the lack of interconnection between major pore sequences. This pore structure differs markedly from that of soils or other unconsolidated porous materials.

¹ Contribution from the Department of Irrigation, University of California, Davis. Presented before Div. I, Soil Science Society of America, Aug. 20, 1962, at Ithaca, New York.

² Research Assistant, Assistant Professor, and Assistant Irrigationist, respectively. Senior author is now Research Assistant, Iowa State University, Ames.

Received for publication July 16, 1962. Accepted for publication November 30, 1962.