دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a bed or deposit composed throughout of substantially the same kind of rock;often a lithologic unit. Each formation is given a name, frequently as a result of the study of the formation outcrop at the surface and sometimes based on fossils found in the formation.

n: a bed or deposit composed throughout of substantially the same kind of rock and forming a lithologic unit.

any distinct, mapable layer.