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海拉尔—塔木察格盆地的岩浆活动主要分为海西期和燕山期。盆地内岩浆岩年龄分布在84~129Ma之间,岩浆岩主要为安山岩、玄武岩和凝灰岩;在盆地中部断陷带油气勘探中发现了CO2气藏,其CO2稳定碳同位素、伴生稀有气体氦和氩同位素组成特征,指示中部断陷带天然气藏中的CO2主要为壳幔混合成因,CO2气藏主要分布在乌北苏仁诺尔断裂构造带、乌南洼槽和巴彦塔拉断裂构造带,但是其分布范围与燕山期岩浆岩体不太吻合,笔者认为有火山岩浆活动带分布的地区不一定都会有CO2气藏。苏2井CO2气藏的成藏特征,反映了断裂活动对CO2生成和聚集的控制作用,指出由切割南屯组及其以下地层的深大断裂沟通的南屯组和铜钵庙组是寻找具有经济价值CO2气藏的有利层段。
The Halal-Tammuzag magmatism is mainly divided into Hercynian and Yanshanian periods. The age of magmatic rocks in the basin ranges from 84 to 129 Ma. The magmatic rocks are mainly andesite, basalt and tuff. In the central oil-gas exploration in the central basin of the basin, CO2 gas reservoirs were found with stable carbon isotopes of CO2, accompanying rare gas helium and argon Isotopic composition indicates that the CO2 in the natural gas reservoirs in the central depression zone is mainly caused by crust-mantle mixing. The CO2 gas reservoirs are mainly distributed in the Wuyin-Soren Noel fault zone, the Wunan depression and the Bayantala fault zone. However, The distribution range is not consistent with the Yanshanian magmatic rock mass. The author believes that there is not necessarily a CO2 gas reservoir in the area where the volcanic magmatic activity belt distributes. The hydrocarbon accumulation characteristics of CO2 reservoir in Well Su-2 reflect the controlling action of fault activity on the formation and accumulation of CO2. It is pointed out that the Nantun and Tongbomiao formations communicating by deep faults that cut the Nantun Formation and below are looking for A favorable layer of economically valuable CO2 gas reservoir.