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

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