Geochemical characteristics of deep-seated natural gas accumulation of the Keshen large gas field in the Kuqa Depression,Tarim Basin

Wei Qiang, Li Xian-qing, Sun Ke-xin, Li Jin, Xiao Zhong-yao, Liang Wan-le, Zhang Ya-chao,

doi:10.11764/j.issn.1672-1926.2019.04.008

2019 , Vol. 30 >Issue 6: 897 - 907

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.04.008

Geochemical characteristics of deep-seated natural gas accumulation of the Keshen large gas field in the Kuqa Depression,Tarim Basin

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1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology (Beijing),
Beijing 100083,China;2.College of Geoscience and Surveying Engineering,China University of Mining and
Technology (Beijing),Beijing 100083,China;3.Institute of Natural Gas Geology,Research Institute of
Petroleum Exploration and Development,PetroChina,Langfang 065007,China;4.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2019-03-20

Revised date: 2019-04-18

Online published: 2019-08-05

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Abstract

The geochemical characteristics and genesis of deep-seated natural gas,type features and homogenization temperature of fluid inclusions,charge time of hydrocarbon and accumulation process of the Keshen large gas field in the Kuqa Depression,Tarim Basin were studied,by using the data of the quantification of gas components,carbon isotope compositions,micro temperature measurement of fluid inclusion,and hydrocarbon generation kinetics.The results show that deep-seated natural gas in the Keshen large gas field is dominated by alkanes,of which methane accounts for 87.30%-98.33%,the C₂+ content is 0%-0.66%,and the dryness coefficient is 0.99%-1.0%.The δ¹³C₁ and δ¹³C₂ values are from -29.3‰ to -26.4‰ and from -21.4‰ to -16.1‰,respectively,indicative of the over mature coal-derived gas.There are two episodes of hydrocarbon inclusions in the Cretaceous Bashijiqike Formation reservoirs in the Keshen large gas field.The first phase inclusion is liquid inclusion with blue-white fluorescence color,which means that the early light oil was charged.The second phase inclusion is gas inclusion with non-fluorescence color.The homogenization temperature of aqueous inclusion symbiosis with gas inclusion is 145-160℃,which indicates that the late gas was charged.The Keshen large gas field has experienced large-scale natural gas charging history since the Late Kuche Formation sedimentary period (about 2.5Ma).Natural gas in the Keshen large gas field is mainly originated from Jurassic coal-bearing source rocks in the Keshen well area and center of Baicheng Sag,which is the late accumulation under the actions of rapid hydrocarbon-generation in the deep-buried strata and strong pressure difference gradient of resource-reservoir.

Key words： Kuqa Depression; Keshen large gas field; Genesis of natural gas; Fluid inclusion; Hydrocarbon generation kinetics; Accumulation process

Cite this article

Wei Qiang, Li Xian-qing, Sun Ke-xin, Li Jin, Xiao Zhong-yao, Liang Wan-le, Zhang Ya-chao, . Geochemical characteristics of deep-seated natural gas accumulation of the Keshen large gas field in the Kuqa Depression,Tarim Basin[J]. Natural Gas Geoscience, 2019 , 30(6) : 897 -907 . DOI: 10.11764/j.issn.1672-1926.2019.04.008

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