塔河油田天然气的碳同位素特征及其成因类型

doi:10.11743/ogg20050510

Abstract

Abstract:

Natural gas in Tahe oilfield is mainly composed of hydrocarbon gas with an average content of(94.09)%.The non-hydrocarbon gas is mainly composed of N₂ and CO₂,with average contents of 4.2% and 1.19%,respectively.Hydrocarbon gas is mainly composed of methane with an average content of 76.23%;while the heavy hydrocarbon has an average content of 17.86%.The drying coefficient(C₁/C_1-5) averages(0.81),indicating typical wet gas as a whole.The δ¹³C₂ values of all samples in this area are less than-30‰,indicating that it is of petroleum gas;and the δ¹³C values are in obvious positive sequence,i.e.δ¹³C₁<δ¹³C₂<δ¹³C₃,indicating that it is typically of organic origin.The associated gas in Tahe oilfield mostly belongs to typical petroleum gas,without any mixture of gas from other sources.The carbon isotope composition of me-thane reveals that the evolution of its source rocks is in the range of mature to over mature stages,and is mainly in highly over-mature stage.Analysis in combination with geologic setting indicates that the source rocks are of Cambrian-Ordovician.The non-linear distribution of some series of carbon isotopes shows that the gas in Tahe oilfield has been charged in two stages.Associated gas has been charged in the early stage,while pyrolysis gas has been charged in the late stage.

Key words: component, carbon isotope, petroleum gas, natural gas, Tahe oilfield

CLC Number:

TE112.1

Gao Bo, Fan Ming, Liu Wenhui, Nan Qingyun, Zhang Dianwei. Carbon isotope features and genetic type of natural gas in Tahe oilfield[J]. Oil & Gas Geology, 2005, 26(5): 618-622.

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Carbon isotope features and genetic type of natural gas in Tahe oilfield

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