دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: igneous or metamorphic rock, which seldom contains petroleum. Ordinarily, it lies below sedimentary rock. When it is encountered in drilling, the well is usually abandoned.

unproductive rocks, usually igneous or metamorphic, at the bottom of a sedimentary rock sequence.

n: (BS&W) see sediment and water (S& W). form thick sequences of sedimentary rock. 2. the area drained by a stream and its tributaries. 3. a geologii: structure in which strata are inclined toward a common centre.

rocks such as coal resulting from decomposition of animal or plant deposition.

n: an elevation on an ancient land surface that is covered by younger sedimentary rocks.

n: a sedimentary rock composed primarily of calcium carbonate (calcite) or calcium magnesium carbonate (dolomite).

n: A kind of sedimentary rock whose content of carbonate is over 50%. Mainly consisted of calcite, dolomite and ankerite.

n: I. the crystallisation or precipitation of soluble minerals in the pore spaces between clastic particles, causing them to become consolidated into sedimentary rock. 2. precipitation of a binding material around grains or minerals in rocks.

the material in the rock between the grains that binds the grains together.

n: a rock of precipitated silica whose crystalline structure is not easily discemible and that fractures conchoidally (like glass). Flint, jasper, and chat are forms of chert.

a hard, silicate sedimentary rock. Similar to flint, but with less ordered structure. A cryptocrystalline form of quartz.

n: a sedimentary rock composed of fragments of preexisting rocks. The principal distinction among clastics is grain size. Conglomerates, sandstones, and shales are clastic rocks.

n: a carbonaceous, rocklike material that forms from the remains of plants that were subjected to biochemical processes, intense pressure, and high temperatures. It is used as fuel.

n: The solid fuel. Used as SCM, manufactured by different coal stone.

sedimentary rock, often highly naturally fractured, composed of thermally modified plant remains.