塔中Ⅰ号坡折带顺西区块顺7井油气地球化学特征及来源

doi:10.11743/ogg20120602

Abstract

Abstract:

Condensate oil and natural gas were tested in the Yingshan Formation of the Lower-Mid Ordovician in well Shun-7 of western Shuntuoguole Block in Tazhong-Ⅰ faulted-slope-break zone,Tarim Basin.The condensate oil features in high content of saturate hydrocarbon and low content of aromatic hydrocarbon and non-hydrocarbon asphaltene.The ratio of saturate hydrocarbon to aromatic hydrocarbon and non-hydrocarbon to asphaltene are 13.51 and 18.50,respectively.The Pr/Ph value is about 1.16 and the heptane and isoheptane values are 33% and 3.8 respectively,indicating high maturity of the condensate oil.As the maturity is high,hopanes series basically disappear and tricyclic terpanes is dominated by C₁₉-tricyclic terpanes.The carbon isotope of the condensate oil from well Shun-7 is -29.6‰ and is similar to that of the Cambrian-sourced oil from well TD-2,indicating the condensate oil of well Shun-7 might originated from the Cambrian source rocks.The wet gas of the well Shun-7 has a methane carbon isotope value of -51.7‰,which is similar to that of the gas from the Ordovician in well TZ-45.The distribution of carbon isotopes of the gas components shows a normal carbon isotope sequence (i e,δ¹³C₁<δ¹³C₂<δ¹³C₃) indicating the gas may come from the Upper Ordovician source rocks.

Key words: maturity, carbon isotope, biomarker, Well Shun-7, Ordovician, Cambrian, Tarim Basin

CLC Number:

TE132.4

Ma Anlai, Jin Zhijun, Li Jingjing, Zhu Xiuxiang. Geochemical characteristics and origin of hydrocarbons in the Well Shun-7 of western Shuntuoguole Block,Tarim Basin[J]. Oil & Gas Geology, 2012, 33(6): 828-835.

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Geochemical characteristics and origin of hydrocarbons in the Well Shun-7 of western Shuntuoguole Block,Tarim Basin

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