دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an unconformity in which formations above and below are not parallel. See unconformity.

An unconformity in which the beds below the unconformity dip at different angles than the beds above it.

adj: layered in parallel and unbroken rows of rock, indicating that no disturbance occurred during deposition of the rock. Compare unconformity.

n: 1. In geology, any sharp or welldefined boundary between two different bodies of rock. 2. A bedding plane or unconformity that separtaes formations.

the depth of the interface between the oil and water, oil and gas, or water and gas.

n: an interruption in sedimentation caused by erosion;the strata above and below the disconformity are parallel. See unconformity. Compare nonconformity.

a change in the formation that may have been caused by ancient erosional forces. Accounts for variances in formation tops in near-by offset wells in a formation with no pay inclination.

usually a crystalline unconformity on which a non-magnetic sedimentary rock sequence has been deposited.

n: a buried landscape in which sediments were deposited on an eroded surface of igneous or metamorphic rock. Compare unconformity.

an unconformity that separates profoundly different rock types, such as sedimentary rocks from metamorphic.

n: a map of the formations directly above an unconformity. Also called a worms-eye map.

abbr: unconformity;used in drilling reports.

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.