Search results
Results from the WOW.Com Content Network
Oil shale formation takes place in a number of depositional settings and has considerable compositional variation. Oil shales can be classified by their composition (carbonate minerals such as calcite or detrital minerals such as quartz and clays) or by their depositional environment (large lakes, shallow marine, and lagoon/small lake settings).
As a result, shales are typically deposited in very slow moving water and are often found in lakes and lagoonal deposits, in river deltas, on floodplains and offshore below the wave base. [13] Thick deposits of shale are found near ancient continental margins [13] and foreland basins. [14]
The largest deposits are found in the remains of large lakes such as the deposits of the Green River Formation of Wyoming and Utah, USA. Large lake oil shale basins are typically found in areas of block faulting or crustal warping due to mountain building. Deposits such as the Green River may be as much as 2,000 feet (610 m) and yield up to 40 ...
The Messel lake bed was probably a center point for drainage from nearby rivers and creeks. A fossil of the primitive mammal Kopidodon, showing outline of fur. The pit deposits were formed during the Eocene Epoch of the Paleogene Period about 47 million years ago, based on dating of basalt fragments underlying fossilbearing strata. [7]
Location of the kukersite deposits within the Baltic Oil Shale Basin in northern Estonia and Russia. The Baltic Oil Shale Basin covers about 3,000 to 5,000 square kilometres (1,200 to 1,900 sq mi). [1] [5] [6] [7] Main kukersite deposits are Estonian and Tapa deposits in Estonia, and Leningrad deposit in Russia (also known as Gdov or Oudova ...
Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons can be produced. In addition to kerogen, general composition of oil shales constitutes inorganic substance and bitumens.
Asphalt has been produced from Pitch Lake since 1851. During the nineteenth and the beginning of the twentieth century, oil seepages in Europe were exploited everywhere with the digging, and later drilling, of wells near to their occurrences and the discovery of numerous small oil fields such as in Italy. [22] [23]
By the end of 2012, the total kukersite resource was 4.8 billion tonnes, of which up to 650 million tonnes was recoverable. Kukersite deposits in Estonia account for 1.1% of global oil shale deposits. [12] Exploratory wells have revealed the existence of petroleum of Lower Paleozoic age beneath Gotland. [13]