无机成因二氧化碳气成藏研究

STUDY ON FORMATION OF INORGANIC CARBON DIOXIDE GAS RESERVOIRS

在总结不同成因条件下CO2成藏地球化学特征、形成条件、气藏分布以及受控的地质—构造环境的基础上,对松辽盆地不同类型火山岩CO2气体脱气进行实验研究,得出了不同岩性的CO2脱气参数;对韧性和脆性剪切作用的动力变质系统条件下构造变形岩石CO2气体释放量进行了模拟计算;对接触变质作用条件下碳酸盐岩石CO2气体释放量进行了地球化学模拟计算。在上述研究的基础上,提出了在火山脱气、动力变质和接触变质作用条件下CO2的形成机制以及气体释放量的计算模型。指出了我国无机成因CO2气藏的分布规律和勘探目标。

This paper presents the general situation on the geological and geochemical characteristics of CO2 pools,their forming condition and distributions as well as their controlled geological-tectonic environments. The degassing experiment of volcanic rocks in Songliao Basin presents the CO2 releasing parameters for different types of volcanic rocks. Geochemical modeling calculation of CO2 releasing has been done based on dynamic metamorphism caused by ductile-brittle shearing deformation. The amount of CO2 releasing is calculated and its relative calculation model is proposed during the contact metamorphism in carbonate rocks. Based on research,the model for the calculation of CO2 degassing and formation of CO2 pools under the condition of degassing from volcanic rocks,dynamic and contact metamorphism have been established. The distributions of CO2 pools and their exploration localities in China have also been proposed.