- Geol.bituminous sand or sandstone from which asphalt can be obtained.[1895-1900]
* * *or bituminous sandDeposit of loose sand or partially consolidated sandstone that is saturated with highly viscous bitumen.Oil recovered from tar sands, commonly referred to as synthetic crude, is a potentially significant form of fossil fuel. The largest known deposits of tar sands occur in Canada's Athabasca River valley, where commercial projects for synthetic oil production from tar sands are being carried out.
* * *▪ geologyalso called bituminous sanddeposit of loose sand or partially consolidated sandstone that is saturated with highly viscous bitumen. Oil recovered from tar sands is commonly referred to as synthetic crude and is a potentially significant form of fossil fuel.A brief treatment of tar sands follows. For full treatment, see heavy oils and tar sands (heavy oil and tar sand).Deposits of bitumen, like those of other heavy hydrocarbons, are thought to be degraded remnants of accumulations of conventional (light-to-medium) oil. Degradation occurs when conventional oil migrates toward the surface and encounters, at temperatures below 93° C (200° F), descending rainwater containing oxygen and bacteria. This leads to the formation of a tarlike substance at the oil and water contact that eventually invades the entire oil pool. The lighter crude-oil fractions are removed by solution, while the paraffins are removed by the bacteria in the water.Open-pit (open-pit mining) techniques can be used to mine thick deposits of tar sands when they occur near the surface. After the tar sand has been excavated, the bitumen has to be separated from the sand and then concentrated and cleaned. This crude bitumen is upgraded in a special coking unit, which produces a blend of lighter hydrocarbon fractions to yield synthetic crude, naphtha, kerosene, and gas oil.The largest known deposits of tar sands occur in the Athabasca River valley of western Canada. The world's only commercial projects for synthetic oil production from tar sands are being carried out in the Athabasca region.
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tar sand — noun : a natural impregnation of sand or sandstone with petroleum from which the lighter portions have escaped * * * Geol. bituminous sand or sandstone from which asphalt can be obtained. [1895 1900] * * * tar sand noun A deposit of sand or… … Useful english dictionary
tar sand — bitumingasis smėlis statusas T sritis chemija apibrėžtis Bitumo prisigėręs smiltainis arba akyta karbonatinė uoliena. atitikmenys: angl. asphaltic sand; bituminous sand; oil sand; tar sand rus. битуминозный песок; нефтеносный песок … Chemijos terminų aiškinamasis žodynas
tar sand — noun Date: 1899 a natural impregnation of sand or sandstone with petroleum from which the lighter portions have escaped … New Collegiate Dictionary
tar sand — noun oil sand … Wiktionary
tar sand — noun Geology a deposit of sand impregnated with bitumen … English new terms dictionary
Utah's Tar Sand — Tar sands in substantial deposits are largely a Utah phenomenon with in the US. Other substantial deposits are located in Canada and South America.http://le.utah.gov/ code/TITLE63/htm/63 1C002.htm] Tar sands pilot plantBeginning with Legislation… … Wikipedia
heavy oil and tar sand — Introduction crude oils (crude oil) below 20° API gravity are usually considered to be heavy. The lighter conventional crudes are often waterflooded to enhance recovery. The injection of water into the reservoir helps to maintain reservoir… … Universalium
Recoverable Tar Sand Resources of the World*, Table — ▪ Table region recoverable resources United States 4.3 Canada 265.5 South America 0.9 Western Europe 0.0 Eastern Europe 0.1 Russia 76.2 Transcaucasia and Central Asia 2.0 Africa 4.0 Asia 0.0 China 1.0 Total world 354.0 *In billion barrels,… … Universalium
Tar — is a viscous black liquid derived from the destructive distillation of organic matter. Most tar is produced from coal as a byproduct of coke production, but it can also be produced from petroleum, peat or wood.Types of tarGeneralThe word tar is… … Wikipedia
Sand — /sand/; Fr. /sahonnd/, n. George /jawrj/; Fr. /zhawrddzh/ (Lucile Aurore Dupin Dudevant), 1804 76, French novelist. * * * I Mineral, rock, or soil particles that are 0. 0008–0.08 in. (0.02–2 mm) in diameter. Most rock forming minerals are found… … Universalium