Geochemistry of Ordovicial Natural Gases and Its Origin and Distribution in Central Tarim Basin, China
Received date: 2009-07-23
Revised date: 2009-11-25
Online published: 2010-04-10
Ordovician natural gas in the central Tarim basin mainly consists of methane with 75%-95% of CH4, 3%-7% of C2+ and 0.73-0.99 of C1/(C2+). Non\|hydrocarbon mainly is N2 and CO2, with 4%-8% and 2%-6%, respectively. The carbon isotope composition of methane and ethane is from -63.1‰ to -37.7‰ and -40.6‰ to -24.8‰, respectively. The natural gas in the eastern part of No.1 structural belt has high dryness coefficient, high N2 content, low CO2 contents, and isotopically light methane(13C1), indicating origin of thermal cracking gas. In contrast, natural gas in the western part is characterized as low dryness coefficient, low N2 content, high CO2 contents and isotopically heavy methane, suggesting mixing of associated cracking gas and mixed gas. Geochemical characteristic of natural gas in the central part of No.1 structural belt and the Ka.1 area was fallen into that of natural gas between eastern and western parts above; the former is mixed of associated gas and primary gas with high dryness coefficient that was sourced from sapropelic, and the later is of thermal cracking gas of crude oil. The regional difference of gas geochemistry would be related to fault and fissure. The time of gas reservoir formation was happened during Himalayan era.
Key words： Natural gas; Geochemistry; Origin; Distribution; Ordovician; Central Tarim basin.
LI Peng-Chun, CHEN Guang-Hao, MENG Qing-Ren, TAN Yu-Ming, HAO Jia-Liang, . Geochemistry of Ordovicial Natural Gases and Its Origin and Distribution in Central Tarim Basin, China[J]. Natural Gas Geoscience, 2010 , 21(2) : 321 -330 . DOI: 10.11764/j.issn.1672-1926.2010.02.321
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