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- W2376310071 abstract "To clarify several questions about the gas origin,regularity of distribution as well as stages of oil and gas accumulations in the Lunnan lower uplift,Tarim Basin,the present paper systematically dealt with geochemical characteristics of natural gases and the homogenization temperature of organic inclusions from the study area.The results showed that hydrocarbon gases in the study area were likely to be a marine sapropel-type dry gas with high to over maturity that could be divided into three types:A cracking gas from crude oils that occurred mainly in the east slope zone of Lungu;a cracking gas from kerogen distributed mainly in the west-middle slope zone of Lungu;and a mixed gas in other areas.Some hydrocarbon gases in the study area showed a reversal of carbon isotopes probably due to two factors:The mixture of natural gases with different maturities and the mechanism of isotopic fractionation by diffusion.Nitrogen in these gases was mainly a pyrolytic product of marine source rocks with high to over maturity,and carbon dioxide showed two possible origins,crust-derived inorganic one or organic one.Additionally,isotope characteristics of the related noble gases indicated that the gas from the Lunnan fault uplift was mixed with a small amount of the mantle-derived gas,whereas gases from other areas were typically crust-derived.Meanwhile,the distributional regularity of natural gases in the study area suggested that the Ordovician gas varied a lot in types that were controlled by faults,besides,the Carboniferous or younger gas was a product of oil cracking.Accordingly,based on the history of oil-gas charging in the study area,the paper proposed that the oil and gas from Ordovician experienced three stages of hydrocarbon charging,namely late Caledonian to early Hercynian,late Hercynian,and mid-late Himalayan,respectively.The Carboniferous oil and gas were mainly accumulated in mid-late Himalayan." @default.
- W2376310071 created "2016-06-24" @default.
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- W2376310071 date "2011-01-01" @default.
- W2376310071 modified "2023-09-24" @default.
- W2376310071 title "Regularity of distribution and accumulation stages of natural gases in the Lunnan lower uplift of the Tarim Basin" @default.
- W2376310071 hasPublicationYear "2011" @default.
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