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松辽断陷盆地群地层,即深层,主要为一套砾岩、砂砾岩、砂岩、粉砂岩、泥岩夹火山岩、煤层组成,从下到上,一般划分为火石岭组、沙河子组、营城组、登娄库组。从层序地层学观点,从下到上划分为3个超层序、11个三级层序(SQ1～SQ11)。发育的沉积相类型有冲积扇相、河流相、湖漫相、湖泊相、扇三角洲相、三角洲相、湖底扇相和火山岩相。从沉积特征可划分为4个演化阶段,即扇三角洲—湖泊—火山岩充填期、扇三角洲—湖泊—河流三角洲充填期、河流三角洲—湖泊—扇三角洲充填期和河流三角洲—湖泊充填期,从而将本区断陷沉积层序归纳为3种层序地层学模式,即断陷型、断坳并存型、坳陷型层序地层学模式。
The strata of the Songliao rift basin basin, ie, the deep layer, are mainly composed of conglomerate, glutenite, sandstone, siltstone, mudstone and volcanic rock and coal seam. From bottom to top, they are generally divided into Huoshiling Formation, Shahezi Formation, City group, Deng Lou library group. From the perspective of sequence stratigraphy, it is divided into three super-sequences and eleven third-level sequences (SQ1-SQ11) from bottom to top. Sedimentary facies are alluvial fan facies, fluvial facies, lake facies, lacustrine facies, fan delta facies, deltaic facies, sublacustrine fan facies and volcanic facies. Sedimentary characteristics can be divided into four evolution stages: fan delta - lagoon - volcanic filling, fan delta - lagoon delta filling, delta delta - lacustrine - fan delta filling and delta - lagoon filling, The faulted sedimentary sequences in this area are summarized into three kinds of sequence stratigraphic models, that is, fault-type, fault-depression coexistence and depression-type sequence stratigraphy.