دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

adj: pertaining to sand or sandy rocks (such as arenaceous shale).

sand particles, 0.625 to 2 mm on the Udden-Wentworth scale.

n: a sandstone in which less than 15% of the total volume is silt and clay.

adj: pertaining to a formation that consists of clay or shale (such as argillaceous sand).

rocks or substances composed of clay minerals, less than 0.625mm, or having a high proportion of clay in their composition such as shale