دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

measurement of a formation being present over a large area.

n: the well that drilles through the crust and Mohorovicic discontinuity to reach the mantle.

n: The boundary between the crust and the mantle of the Earth, which varies from approximately 5 km [3 miles] under the midoceanic ridges to 75 km [46 miles] deep under the continents. This boundary, commonly called the Moho, was recognized in 1909 by Croa

n: a discontinuity or zone between two adjacent air masses that is not moving or is moving only a little.

n: 1. lack of continuity in deposition between rock strata in contact with one another, corresponding to a gap in the stratigraphic record. 2. the surface of contact between rock beds in which there is a discontinuity in the ages of the rocks. See angular unconformity, disconformity.

n: A geological surface separating older from younger rocks and representing a gap in the geologic record. Such a surface might result from a hiatus in deposition of sediments, possibly in combination with erosion, or deformation such as faulting.


a geologic aged erosional removal from the top of a formation. Reservoir rocks below this surface may contain hydrocarbon deposits if the unconformity acts as a seal.