Terpanes from oil shows of Lake Baikal

Каширцев, В. А.; Конторович, А. Э.; Москвин, В. И.; Данилова, В П; Меленевский, В Н

doi:10.1134/s0965544106040013

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…Recently, these hydrocarbons have been identified in Lake Baikal oil shows [4]. Our studies have shown that all known Kalmykian oils occurring in Jurassic and Cretaceous sediments [5] and oils of Tatarstan, the Volga-Ural region, Chechnya, Dagestan, and Azerbaijan are liter ally full of these bicyclic sesquiterpanes.…”

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confidence: 86%

Thermodynamic stability of petroleum C15 polyalkylated bicyclo[4.4.0]decanes at 500 and 600 K

et al. 2012

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The thermodynamic equilibrium concentrations of petroleum C 15 polymethylated bicy clo[4.4.0]decanes (sesquiterpanes) at 500 and 600 K have been experimentally obtained for the first time via the aluminosilicate mediated equilibrium isomerization of the saturated 200-300°C fraction of crude oils of different genotypes. It has been found that sesquiterpane isomers with an angular carbon atom and methyl and ethyl substituents in the molecule are the least thermodynamically stable in the equilibrium mixture and their relative concentration increases with increasing temperature from 500 to 600 K; the most stable isomer is 2,3,3,7,7 pentamethylbicyclo[4.4.0]decane.

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mentioning

confidence: 86%

Thermodynamic stability of petroleum C15 polyalkylated bicyclo[4.4.0]decanes at 500 and 600 K

et al. 2012

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“…Sediments from the central Basin were collected from sites with liquid oil discharge (site 7, 8-Gorevoy Utes and site 10-Cape Tolsty; Figure 1; Table 1; [37][38][39][40][41]), gas seeps and mud volcanoes, where gas hydrates were detected (mud volcano Kitami-site 9 and Kukuy-site 11; Figure 1; Table 1; [42,43]). Oils from the discharge zones of the central and the southern Baikal are generally well studied and their composition is comparable to those of the Cretaceous and earlier ages (most likely the Oligocene-Early Miocene) from other deep-sea freshwater reservoirs [39,40]. Liquid oil discharges to the water as a consequence of vertical migration along the permeable zones of tectonic faults [44].…”

Section: Geological Setting Of Lake Baikal Sampling Sitesmentioning

confidence: 99%

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

et al. 2022

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This paper performs a detailed study of a wide set of organic-geochemical proxies in 15 sediment cores collected from the main basins of Lake Baikal (the northern, the central and the southern) where processes of focused fluid discharge were detected. A variety of studied zones includes sites with gas and hydrothermal seepage, mud volcanoes with or without gas-oil fluid discharge, gas hydrates and authigenic carbonates. The composition of the dispersed organic matter and individual hydrocarbon molecular markers (n-alkanes, dimethyl alkanes, isoprenoids, steranes, terpanes and polycyclic aromatic hydrocarbons) testify to the input from predominantly allochthonous terrestrial and autochthonous microbial and algal sources. The studied sources, maturity and biodegradation parameters of organic matter vary significantly for areas with different fluid discharge. The composition of specific biomarkers including isoprenoids and immature hopanoids reflects the lateral and vertical changes of microbial activity in sediments associated with various environmental conditions. The identified types of terpanes distribution (mature, mixed and immature) correlate well with types of fluid discharge and attest to the development of various methanogenic and methanotrophic microbial communities in sediments. Moreover, the revealed specificity of microbial molecular markers distribution allowed us to suggest the fluid discharge processes in zones where they were not previously detected.

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Natural pollutants of Northern Lake Baikal

et al. 2015

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Hot and cold springs in the northwestern shore of Lake Baikal are investigated as natural pollutants of the lake, which can interfere with its chemistry. The study includes chemical analyses of lake water samples from different depths in the North Baikal basin, as well as waters of hot and cold onshore springs, and Baikal tributaries collected in 2007 through 2013. Thermal waters in the shore of Lake Baikal have much higher SO 4 , Cl, F, Na, and SiO 2 concentrations than those in the lake water, as well as ten to hundred times greater enrichments in Li, Rb, Cs, Ga, As and W. Mineral water in cold springs is generally similar to the Baikal water with respect to total dissolved solids (TDS) and major-and trace-element chemistry. However, the Milky cold spring discovered in the lower reaches of the B. Cheremshan River within a few km from the lake stands out in its unusual Ca-Mg-SO 4 composition, low pH (3.57) and high TDS (535 mg/l), and trace-element enrichments in Al, Mn, Ni, Co, Zn, Y, and REE. The concentrations of these elements are still higher, up to one or two orders of magnitude, in suspended solids abundant in the spring water. This water composition is typical rather of mine drainage in sulfide mineralization provinces and prompts the existence of a sulfide orebody in the area. Mn, Co, Ni, Zn, and Cd occur in the dissolved form, and their concentrations in stream water near the B. Cheremshan inlet into Baikal are only slightly lower than immediately downstream of the spring; REE and Y are ten times lower because of precipitation from the river water. However, all metals the spring water leaches from the surrounding rocks eventually end up in Lake Baikal. Although the spring has much greater enrichments relative to the Baikal water in a number of elements, it hardly can cause any significant change to the lake composition. Only local chemical anomalies of Mn, Al, Co, Ni, Zn, Cd, REE and Y can be expected in the bottom sediments where the lake uptakes the B. Cheremshan stream.

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Terpanes from oil shows of Lake Baikal

Cited by 12 publications

References 8 publications

Thermodynamic stability of petroleum C15 polyalkylated bicyclo[4.4.0]decanes at 500 and 600 K

Thermodynamic stability of petroleum C15 polyalkylated bicyclo[4.4.0]decanes at 500 and 600 K

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

Natural pollutants of Northern Lake Baikal

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