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Unit 7. Geology

Lead-in

Ex. 1. Study the following key terms of geology and their definitions.

      1. Bodies of rock

basement

фундамент

The rock layer below which economic hydrocarbon reservoirs are not expected to be found, sometimes called economic basement.

bed

слой

A layer of sedimentary rock distinguishable from adjacent beds. A bed is the smallest stratigraphic unit, generally a centimeter or more in thickness.

outcrop

обнажение

A body of rock exposed at the surface of the Earth.

deposit

отложение

Sediments that have accumulated, usually after being moved by wind, water or ice.

      1. Types of rock

carbonate rock

карбонатная порода

Rock commonly generated by marine organisms such as corals.

clastic rock

кластическая (терригенная) порода

Rock consisting of broken fragments derived from preexisting rocks and transported elsewhere and redeposited before forming another rock.

limestone

известняк

A carbonate sedimentary rock predominantly composed of calcite of organic or chemical origin.

sandstone

песчаник

A clastic sedimentary rock consisting of predominantly sand.

shalestone

аргиллит

A fine-grained sedimentary rock formed by consolidation of clay- and silt-sized particles into thin, relatively impermeable layers.

siltstone

алевролит (алеврит)

Sedimentary rock primarily composed of silt, intermediate in grain size between the coarser sandstone and the finer shale.

      1. Geological processes

compaction

уплотнение

The physical process by which sediments are consolidated, resulting in the reduction of pore space as grains are packed closer together.

erosion

эрозия

The displacement of rock by the wind, water, ice, movement in response to gravity, or living organisms.

weathering

выветривание

The physical, chemical and biological processes that decompose rock at and below the surface of the Earth through low pressures and temperatures and the presence of air and water.

      1. Geologic features

fault

разлом

A crack or joint between two blocks of earth that are moving or have moved relative to each other.

fold

складка

A wave-like geologic structure that forms when rocks deform by bending instead of breaking.

fracture

трещина

A crack or surface of breakage within rock. A fracture along which there has been displacement is a fault.

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