塔北地区甲烷碳同位素特征与烃类运移方式

doi:10.11743/ogg20050409

Abstract

Abstract:

Various patterns of hydrocarbon migration would result in different fractionation effects of methane carbon isotopes.When hydrocarbons migrate through diffusion,methane carbon isotopes tend to get heavier along with increasing migration distance.For example,methane carbon isotopes in different wells in Tabei area change from-46.98‰—55.98‰ in the deep Triassic to-31.47‰—37.51‰ in the shallow Quaternary.In Forties oilfield in North Sea,the methane carbon isotopes are lighter in the near surface sediments over the oilfield(the value of δ¹³C₁ being-40‰),and they also tend to get heavier along with the increasing migration distance to the periphary(the value of δ¹³C₁ being-30‰).When hydrocarbons migrate through filtration,methane carbon isotopes do not change along with migration distances.For example,the methane carbon isotopes of natural gas in the Ordovician source rocks in Akekumu structure,Tabei area,is in the range of(-34.85‰)—34.98‰.The methane carbon isotopes measured through surface geochemical exploration is in the range of-34.62‰-36.56‰,which is near or equal to that in the subsurface Ordovician,indicating that the surface and subsurface methane carbon isotopes have cogenetic relationship.The reason that causes apparent and regular variation of methane carbon isotopes in various hydrocarbon migration patterns is that the methane molecules with light carbon isotopes would be dissolved during diffusion migration.As a result,the carbon isotopes detected with acidolitic hydrocarbon method would be fractionated,or become heavier upward along the stratigraphic section.While during filtration migration,negligible dissolution of methane in water would not change the methane carbon isotope features in extensive migration,due to the large scale and rapid migration of natural gas.

Key words: methane carbon isotope, migration pattern, diffusion type, filtration type

CLC Number:

TE112.3

Zhu Huaiping, Cheng Tongjin, Li Wu, Wang Guojian. Features of methane carbon isotope and patterns of hydrocarbon migration in Tabei area[J]. Oil & Gas Geology, 2005, 26(4): 450-454,460.

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Features of methane carbon isotope and patterns of hydrocarbon migration in Tabei area

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