松辽盆地庆深气田储层火山岩锆石地质年代学研究

SHRIMP zircon geochronology of reservoir volcanic rocks in the Qingshen gas field,Songliao Basin

庆深气田储层火山岩由多期火山喷发叠置形成，分布于自垩系下统营城组，以酸性喷发岩为主。火山岩离子探针（sHRIMP）U—Pb锆石年龄测定结果表明，储层火山岩年龄集中在111～115Ma，介于早白垩世晚期阿普第阶（Aptian）和阿尔布阶（Albian）分界线附近。兴城与升平两个天然气产区储层火山岩测年结果对比表明，它们是同一时代火山作用产物，并非以前所认为的兴城地区火山岩属营城组一段，升平地区火山岩属营城组三段。该成果对于松辽盆地火山岩气藏的勘探开发具有重要的实际意义。

The reservoir volcanic rocks of Early Cretaceous Yingcheng Formation in the Qingshen gas field of Songliao Basin are composed mainly of rhyolites. SHRIMP zircon U-Pb ages of nine volcanic rock samples from Xingcheng and Shengping range from lllMa to 115 Ma, falling into the Early Cretaceous Aptian to Albian stage. The volcanic eruption ages of the two regions suggest that all the reservoir volcanics were formed at the same period of volcanism, and this understanding is quite different from the previous opinions on these rocks. In the past, the volcanic rocks were thought to have different ages, and the volcanic reservoir rocks of Shengping were believed to be younger （K1yc^3） than those from Xingcheng （K1yc^1） . It seems that these opinions should be modified according to the authors＇ results. The results achieved in this paper is of great significance in exploring and exploiting volcanic gas pools within the Songliao Basin.