Conceptual Model (IMAGE) Geological Society of America Caption Idealized volume of reservoir sandstone undergoing vertical compaction with zero horizontal strain, typical of producing gas reservoirs. Note, in this simplification, all grain surfaces are coated with uniform clay films. In a real sandstone reservoir, clay films are discontinuous and locally absent, especially in distal regions of the field (orange--load-supporting quartz framework; blue--sparse feldspar grains; red--clay films). Credit The conceptual model was developed by B.A. Verberne, S. Hangx, and C. Spiers. Usage Restrictions Credit B.A. Verberne, S. Hangx, and C. Spiers. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.