LIGHT HYDROCARBON COMPOSITIONS OF NATURAL GASES AND THEIR APPLICATION IN SICHUAN BASIN
Received date: 2007-06-17
Revised date: 2007-08-16
Online published: 2007-10-10
The C5-C7 light hydrocarbon compounds in 59 natural gas samples collected from the formations of Permian (Maokou,Changxing),Triassic (Feixianguan,Jialingjiang,Leikoupo,Xujiahe) and Jurassic in Sichuan basin were studied and contrasted thoroughly.The light hydrocarbon have play an important part in three aspects in Sichuan basin.①Identifying the types of organic matter.The light hydrocarbon composition of the natural gas of Xujiahe formation in southwestern Sichuan basin is of the characteristic of high naphthenic hydrocarbon and aromatic hydrocarbon,but in middle and southern Sichuan basin is of high naphthenic hydrocarbon.It is supposed that the natural gases mainly originated from the humic organic matter.②Reflecting migration phase and water washing.The ratios of aromatic hydrocarbon to n-hexane,hexamethylene,n-heptane,respectively in natural gases in middle and southern Sichuan basin are very close to that of gas condensates.It is concluded that the light hydrocarbon is of high paraffin and low aromatic hydrocarbon is mainly concerned with the water washing during migration.③Indicating the characteristic of crude oil cracked gas.The light hydrocarbon in gases mainly originated from marine sapropelic organic matter in Maokou to Leikoupo formations is of high methyl-cyclohexane.It is a sign of crude oil cracked gas.
XIE Zeng-Ye, YANG Wei, HU Guo-Yi, LI Zhi-Sheng, SUN Qing-Wu . LIGHT HYDROCARBON COMPOSITIONS OF NATURAL GASES AND THEIR APPLICATION IN SICHUAN BASIN[J]. Natural Gas Geoscience, 2007 , 18(5) : 720 -725 . DOI: 10.11764/j.issn.1672-1926.2007.05.720
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