Abstract: Igneous rocks and the forming of oil gas pools in the Lishu Dehui depression of the southeast uplift in Songliao Basin has been studied by comprehensive research on the physical properties of igneous rocks,manifested in gravity,magnetic,seismic,well log,and by combining sequence stratigraphy with isotope assay.The forming of the igneous rocks in this area was controlled by deep fault.The intersection position of the fault is the center of volcanic eruption.Volcanic and intrusive faces have been recognized in the seismic sections.The study of igneous rocks in sequence demonstrates that the magma activities in this area was mainly distributed in Huoshiling period and the end of Yingchen period.The research for the relations between magma activities and the formation of oil gas pools,because it increased the temperature of the thermal field,which is favorable to the conversion of organic matter to hydrocarbons.Besides,volcanic rocks could serve as a reservoir and seal,and intrusive rocks only as seal.Neighboring source rocks,development of fractures and faults through the source rocks are the leading conditions for the formation of volcanic reservoirs.

Key words: igneous rocks, geophysieal anomaly, sequence, isotope geological age, Songliao Basin

摘要： 综合火成岩物性在重力、磁力、地震和测井中的反映及层序中火成岩研究,并结合火成岩同位素年龄资料,研究了松辽盆地东南隆起梨树-德惠凹陷覆盖区火成岩发育特征及对油气的影响.东南隆起区火成岩形成机制主要受板内裂谷深大断裂控制,大断裂的交汇处是火山口喷发中心.在地震剖面上分别识别出了火山岩和侵入岩相等几种.层序中火成岩研究表明,该区岩浆活动主要集中分布于火石岭期与营城组末期.探讨了岩浆作用在油气藏形成中的四种作用,认为该区火山活动对油气的形成有利因素为主,它提高了地温场,有利于有机物向烃类转化,并提供储集空间和圈闭.临近生油凹陷、火山岩中次生裂缝的发育及断至源岩的断层是火山岩油气藏形成的先决条件及重要因素.

关键词: 火成岩, 地球物理异常, 层序, 同位素地质年龄, 松辽盆地