Petroleum Science >2013,??Issue 3:??327-335 DOI: https://doi.org/10.1007/s12182-013-0281-6
Geochemical characteristics of noble gases innatural gas and their application in tracingnatural gas migration in the middle part of thewestern Sichuan Depression, China Open?Access
文章信息
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2 Geology Scientific Research Institute of Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257015, China
文章摘要
reservoirs in the middle part of the western Sichuan Depression, China, were analysed. Results show that
the volume content of crustal noble gases accounts for 97.9% to 99.7% of the total noble gas content,
indicating that the noble gases in the study area are very largely derived from the crust. Moreover, the
40Ar time-accumulating effect of source rocks is used to determine the complex relationship between
gases and source rocks in this area, and the results agree well with that from analysis of source rock
light hydrocarbons. Due to the short migration distance, the separation of 4He and 40Ar is not significant
in Xujiahe natural gas and Lower and Middle Jurassic natural gas, so it is difficult to trace natural gas
migration. However, this separation characteristic of 4He and 40Ar in Middle and Upper Jurassic natural
gas is significant, which indicates that natural gas migration was from the Middle Jurassic to Upper
Jurassic formations. In addition, the variation trends of 3He/4He ratio and δ13C1 value indicates that natural
gas migration is from the Xujiahe formation to the Jurassic layer in the study area.
关键词
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Western Sichuan Depression, noble gas, He and Ar isotopes, natural gas migration