دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a distinctive, easily identified rock stratum, especially one used as a guide for drilling or correlation of logs.

n: A widespread distinctive rock unit that can be correlated readily over a large area. The most useful marker beds tend to form rapidly, such as during volcanic or geologically instantaneous depositional events, and have unusual seismic, magnetic, electrica