火山岩气藏是松辽盆地深层天然气勘探的重要领域。应用显微热台和激光拉曼光谱技术,研究了徐家围子断陷火山岩气藏储层原生包裹体和次生包裹体的流体组成和均一化温度特征后发现:该储层原生和次生包裹体的流体性质有明显差异;次生包裹体组成与目前在储层中见到的天然气相似,其均一化温度可以反映天然气的成藏期。利用次生包裹体形成温度并结合储层的热演化史分析确定的单井成藏期表明:徐家围子断陷火石岭组天然气成藏期为114～68Ma,主要成藏期为90～70Ma,成藏时间一般大于10Ma,从断陷南部向北部,天然气的成藏期呈现逐渐变新的趋势;营城组天然气的成藏期为100～65Ma,主要成藏期为100～80Ma,成藏时间一般小于10Ma,从断陷北部向南部,天然气的成藏期呈现逐渐变新的趋势。徐家围子断陷天然气成藏期的变化主要与烃源岩展布的分割性和埋藏史的差异性有关;该气藏横向分布受源岩区控制。

The igneous reservoir take a very important role in the field of deep buried gas prospecting in Songliao basin. This paper take Xujiaweizi rift igneous gas reservoir as an example, applied micro heat-platform and laser Raman spectrum technology, probe in the fluid composition and impartial temperature characteristic of primary and secondary inclusion, it was discovered that there is a obviously difference in both fluid property and the composition of secondary inclusion is similar to that of reservoir natural gas, it proved that the impartial temperature of secondary package is able to reflect the natural gas reservoir forming period. Used secondary inclusion formed temperature combine with the analysis result of reservoir heat evolution history determined the individual well gas reservoir forming period. It shows that natural gas reservoir forming period of Huoshanling formation in Xujiweizi rift is 114~80 Ma, major period is 90~70 Ma, reservoir forming time is greater than 10 Ma in common, gas reservoir forming period is gradually tend to be more early from south to north of the rift; To Yingcheng formation, the natural gas reservoir forming period is 100~65 Ma, major period is 100~80 Ma, reservoir forming time is less than 10Ma in common, gas reservoir forming period is gradually tend to be more early form north to south of the rift. Natural gas reservoir forming period change in rift are related to the partition of the development of hydrocarbon source rock and the difference of the buried history, the distribution of source rock control the cross development of gas reservoir.