The gas origin in Changxing-Feixianguan gas pools of Longgang Gasfield in Sichuan Basin
Received date: 2015-03-04
Revised date: 2015-04-27
Online published: 2016-01-10
The origin of natural gas in Changxing-Feixianguan Formations of Longgang Gasfield was studied in detail using geochemical methods in this paper.The gas has a very high dryness coefficient,very low ethane and other heavy hydrocarbons.Apart from a small amount of N2 and CO2,the non-hydrocarbon gases,it generally contains H2SWithin the field location,Changxing-Feixianguan Formations themselves do not have hydrocarbon-generation potential.Near the edge of the Kaijiang-Liangping Trough,there developed Dalong Formation,but it also has very low TOC content in the area of Longgang Gasfield,cannot act as effective source rock.The geochemistry of natural gas is much different from the gases generated by Silurian and Cambrian source rocks.So it is impossible that the gas in Longgang Gasfield is from Silurian and Cambrian source rocks.Gas reservoirs generally contain bitumen,which is considered a product of crude oil cracking.That the carbon isotope fractionation between the bitumen and methane is not distinct indicates that the gas is not directly from oil cracking.The carbon of methane and ethane has isotopically heavy value,which is considered from high-over mature coal-formed gas,mainly from Longtan Formation coal measures.Compared with the gas from high-over mature Xujiahe coal measure source rock in western Sichuan Depression,the methane in Longgang Gasfield has abnormal heavier carbon isotopic value.It is due to the superposition of these two factors together:Higher evolution of source rocks and mixing of gas degassing from water.It is not caused by TSR that most researchers believed at present because the methane carbon isotopic values have no relationship with H2S content.
Qin Sheng-fei，Yang Yu，Lv Fang，Zhou Hui，Li Yong-xin . The gas origin in Changxing-Feixianguan gas pools of Longgang Gasfield in Sichuan Basin[J]. Natural Gas Geoscience, 2016 , 27(1) : 41 -49 . DOI: 10.11764/j.issn.1672-1926.2016.01.0041
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