دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The phenomenon that nature gas enters into another formation or overflow the surface through circline cement mantle between casing and formation.

the weak section of soft rock in the upper mantle just below the lithosphere. It is involved in plate movement. Depth is 70 to 100 km below the surface.

an area in the upper mantle from which magma rises. A hot spot can endure for 10 million years or more.

n: equilibrium between large segments of the earths crust, which float on the denser mantle in such a way that thicker segments extend higher and deeper than thinner segments, and lighter blocks rise higher than denser blocks.

outer layer of the earth including the crust and the uppermost mantle.

n: the hot, plastic part of the earth that lies between the core and the crust. It begins 5 to 30 miles (10 to 50 kilometres) beneath the surface and extends to 1,800 miles (2,900 kilometres).

n: The intermediate layer of the Earth beneath the crust that is about 2900 km thick [1820 miles] and overlies the core of the Earth. The mantle consists of dense igneous rocks like pyroxenite and dunite, composed of the minerals pyroxene and olivine. The cr

the middle layer of the earth, laying just below the crust and composed of relatively high density rock.

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 pi: movement of great crustal plates of the earth on slow currents in the plastic mantle, similar to the movement of boxes on a conveyor belt. Today geologists believe that the earths crust is divided into six major plates and several smaller ones atop some of which the continents are carried away from a system of mklocean ridges and toward another system of deep-sea trenches. The theory of plate tectonics explains most of the mysteries that confounded earlier geologists. Compare continental drift.