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- Title
柴达木盆地冷湖构造带天然气地球化学特征及 成藏主控因素.
- Authors
周飞; 王波; 李哲翔; 隋国杰; 祁文珍; 崔守凯; 马进业; 成定树
- Abstract
The studies on geochemical characteristics and accumulation controlling elements for natural gas in various structural belts of Lenghu area of Qaidam Basin are quite weak. Here in this paper,the geochemical characteristics of the natural gas were analyzed with natural gas compositions and carbon isotope. The genetic difference and controlling factors to the natural gas and reservoir were discussed combined with the reservoir conditions,technical history and hydrocarbon generation evolution. The results show that the natural gas is dom - inated by methane(66%-97%)while the heavy hydrocarbons is relatively high(2%-11%). The carbon isotope values(δ13C1)of No. 3 to No. 5 belts and No. 5 to No. 7 belts range from - 46.4‰- - 25.4‰ and - 25.4‰- -42.7‰ respectively,suggesting the maturity differences for various technical belts. The ethane carbon isotope values(δ13C2)from Jurassic range from - 27.18‰-- 30.3‰(with an average of - 28.54‰)and the values for Palaogene and Neogene are usually over 28‰,indicating the humic organic matter contribution and coal-gener- ated gas which probably mixed with some oil-typed gas. The different source kitchens and various hydrocarbon generate periods should be responsible for the differences of the natural gas composition. The reservoir in Palao- gene and Neogene is characterized with late dynamic accumulation as the reservoir trap of Palaogene and Neo- gene evolves along with the hydrocarbon generation and charging. Overturn slip faults in shallow layers provide a highway for the natural gas loss with relatively weak hydrocarbon accumulation. The structural trap in deep Ju- rassic and bedrock unconformities developed early and well,which is good for the early hydrocarbon generation and accumulation. The results also indicate that the deep layers were likely the prospecting exploration areas.
- Subjects
GAS reservoirs; PROSPECTING; CARBON isotopes; ORGANIC compounds; NATURAL gas; NEOGENE Period; HYDROCARBONS
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 10, p1496
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.06.003