塔里木盆地塔中隆起寒武系深层油气地球化学特征及成因

doi:10.11743/ogg20170210

Abstract

Abstract: The Cambrian carbonate reservoirs of Tazhong uplift is rich in oil and gas.However,there are different opinions on the origin and genetic types of oil and gas in this area due to the complex tectonic setting.In this paper,we studied the origin and genetic types of oil and gas through a detailed analysis of the composition and carbon isotope data of condensate oil and gas in different intervals of the Cambrian in ZS1,ZS1C and ZS5 wells and the geochemical characteristics of the Cambrian-Lower Ordovician and Middle-Upper Ordovician source rocks.The results indicate that the Cambrian gas in the Tazhong uplift is typical cracking gas of sapropelic kerogen.Gas in the Xiaoerbulake Formation is typical over-mature dry gas with a drying coefficient of higher than 0.98 and N₂ content of 2.5%~4.0%.The carbon isotopes of group composition and individual n-alkanes of condensate in the Xiaoerbulake Formation are relatively heavy.The carbon isotope of C₉-C₂₀ n-alkane are -28.8‰~-26.3‰.These geochemistry characteristics indicate that the condensate oil and gas in the Xiaoerbulake Formation originated from the Cambrian-Lower Ordovician source rocks.While the natural gas in the Awatage and Wusonggeer Formations is low-mature wet gas with a drying coefficient of 0.63~0.78 and N₂ content of 0.2%~0.8%.The carbon isotope of group composition and individual n-alkanes of condensate in the Awatage and Wusonggeer Formations are relatively light.The carbon isotopes of C₉-C₂₃ n-alkane are -37.25‰~-32.56‰.These geochemistry characteristics indicate that the condensate oil and gas in the Awatage and Wusonggeer Formations originated from the Middle-Upper Ordovician source rocks.

Key words: gas type, source of oil and gas, organic geochemistry, Cambrian, Tazhong Uplift, Tarim Basin

CLC Number:

TE122.1

Shi Jianglong, Li Jian, Li Zhisheng, Hao Aisheng. Geochemical characteristics and origin of the deep Cambrian oil and gas in the Tazhong Uplift,Tarim Basin[J]. Oil & Gas Geology, 2017, 38(2): 302-310.

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Geochemical characteristics and origin of the deep Cambrian oil and gas in the Tazhong Uplift,Tarim Basin

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