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 C

19

-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

δ

13

C

1

<

δ

13

C

2

<

δ

13

C

3

) indicating the gas may come from the Upper Ordovician source rocks.