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火山岩的脱气实验和对昌德东CO2气藏气源的分析结果表明:加热火山岩到250℃时,脱出挥发分总量为0.0299～0.0790mL/g,其中CO2脱出量为0.0218～0.0706mL/g(0.429～1.387wt%);挥发组分以CO2为主,还含有H2、CO、CH4等还原性气体,以及少量低碳烷烃,CO2含量和总烃呈现反比关系;基性岩的CO2脱出量、脱出率高于中、酸性岩;CO2脱出量与岩石碱质含量正相关。松辽盆地北部昌德东CO2气藏成藏模式为“自生自储”,成藏CO2气主要来自深部被火山岩吸附的气。随岩浆上升,在岩浆冷凝成火山岩的过程中被吸附于火山岩的节理、劈理和晶体位错之中的CO2气,连同火山岩包体中的残留气,成为高纯CO2气藏的主要补给源,并非地幔气体沿大断裂上来直接充注成藏。
The degassing experiment of volcanic rocks and the gas source analysis of Chandongdong CO2 gas reservoir show that when the volcanic rocks are heated to 250 ℃, the total amount of volatilization is 0.0299 ~ 0.0790mL / g, and the CO2 prolapse is 0.0218 ~ 0.0706mL / g (0.429 ~ 1.387wt%). The volatile components were dominated by CO2 and contained reducing gases such as H2, CO and CH4, as well as a small amount of low-carbon alkanes. The CO2 content showed an inverse relationship with the total hydrocarbons. The amount of prolapse and the rate of prolapse are higher than those of medium and acidic rocks. The amount of CO2 pro-out is positively correlated with the content of rock alkali. The hydrocarbon accumulation mode of Changde East CO2 gas pool in the northern part of Songliao Basin is “self-generating and self-reserving”, and hydrocarbon accumulation mainly comes from the gas adsorbed by volcanic rocks in the deep part. As the magma rises, the CO2 gas adsorbed to the joints, cleavages and dislocations of the volcanic rocks during the condensation of the magma into volcanic rocks, together with the residual gas in the volcanic inclusions, becomes the main recharge source for the high-purity CO2 gas reservoir It is not the mantle gas that plunges directly into the reservoir along the fault.