新疆石油地质 ›› 2009, Vol. 30 ›› Issue (4): 537-542.

• 讨论与争鸣 • 上一篇    下一篇

松辽盆地天然气成因探讨

魏志平1, 张景廉2, 方乐华2, 杜玉潭2   

  1. 1.中国石油大学(北京) 资源与信息学院,北京 102249;
    2.中国石油 勘探开发研究院 西北分院,兰州 730020
  • 收稿日期:2008-02-23 出版日期:2009-08-01 发布日期:2020-08-25
  • 作者简介:魏志平(1963-),安徽巢湖人,高级工程师,博士,油气勘探, (E-mail)weizp@petrochina.com.cn.

Controversy of the Origins of Natural Gas in Songliao Basin

WEI Zhi-ping1, ZHANG Jing-lian2, FANG Le-hua2, DU Yu-tan2   

  1. 1. Faculty of Resources and Informatien Technology, China University of Petroleum, Beijing 102249,China;
    2. Northwest Branch,Research Institute of Petroleum Exploration and Development, PetroChina, Lanzhou, Gansu 730020, China
  • Received:2008-02-23 Online:2009-08-01 Published:2020-08-25

摘要: 松辽盆地徐家围子断陷的天然气成因备受争议,焦点是有机成因气还是无机成因气。费托合成烃的反应可以发生如光合作用那样的碳同位素分馏作用,但未必显示碳同位素的反序分布。热液条件下费托反应在自然界更普遍,但其碳氢同位素的动力学分馏特征尚不十分清楚,碳同位素组成用于油气物源示踪识别仍有很大的不确定性。松辽盆地深部地壳特征表明,中地壳有一低速高导层,地幔流体 CO2 、H2 可在此进行费托合成烃的反应,这种超临界的流体的反应可形成烃和烃类化合物。根据这一思路,松辽盆地深部(不仅仅是火山岩,还有花岗岩等基底岩石)有更多的天然气尚待勘探与发现,也可在其他盆地寻找大油气田。

关键词: 松辽盆地, 天然气, 无机成因, 费托合成反应, 碳同位素, 中地壳, 低速高导层, 地幔流体

Abstract: The origin of natural gas of Xujiaweizi fault depression in Songliao basin is heavily debatable on that account whether it is biogenetic or abiogenetic. There are different interpretations on the origins of natural gas in the nature. The carbon isotopic fractionation can be taken place in Fischer-Tropsch synthesis just like in plants' photosynthesis possibly without indication of reverse distribution of carbon isotope. Fischer-Tropsch reaction under the hydrothermal conditions is very common in the nature, but the kinetic fractionation mechanism of carbon and hydrogen isotopes is not clear. Carbon isotope used for the trace distinguishing of oil-gas sources is still of great uncertainty. The deep crust structures of Songliao basin show that there exists a low velocity-high conductive layer in the mid-crust, in which the mantle fluids enriched with CO2 , H2 could take part in reactions of Fischer-Tropsch synthesis and generate hydrocarbon compounds. Based on this thought, much more natural gases could be explored and discovered in deep Songliao basin (including volcanic rocks, granites and other basement rocks). In addition, giant oil-gas fields could be found out in other domestic basins by such a thought.

Key words: Songliao basin, natural gas, inorganic origin, Fischer-Tropsch synthesis, carbon isotope, mid-crust, low velocity-high conductive layer, mantle fluid

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