摘要
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 Songliao fault basin group include Huoshiling, Shahezi, Yingcheng and Denglouku Formations. From the viewpoints of sequence stratigraphy, this set of strata can be dividing into 3 super-sequences and 11 third-order sequences. The sedimentary facies developed mainly include alluvial fan, fluvial, lake flat, lacustrine, fan delta, delta, lake-floor fan and volcanic rocks. There developed four depositional filling-up stages, i.e., fan delta-lacustrine-volcanic rocks, fan delta-lacustrine-delta, delta-lacustrine-fan delta and delta-lacustrine The authors, therefore, concluded three types of sequence stratigraphic models including fault basin, faultdepression basin and depression basin.
关键词
松辽盆地
深层
沉积相
沉积演化
层序地层学
模式
Songliao basin, deep strata, depositional evolution, sequence stratigraphy, model