松辽盆地沉积地层与成藏响应

SEDIMENTARY STRATA AND HYDROCARBON ACCUMULATION RESPONSE OF SONGLIAO BASIN

松辽盆地发育断陷、坳陷及反转-萎缩3个一级构造层序，10个二级层序。断陷构造层序以火山岩、冲积扇、扇三角洲和滨浅湖相沉积为主，坳陷构造层序以河流、大型三角洲和半深湖-深湖相沉积为主，反转-萎缩构造层序以河流、小型三角洲和滨浅湖相沉积为主。断陷构造层序煤系源岩与砂砾岩及火山岩构成深部含气组合，坳陷构造层序深湖相泥岩与大型三角洲及河流相砂岩构成下部油气共存、中部及上部含油组合，反转-萎缩构造层序滨浅湖泥岩与河流砂岩构成以次生气藏及生物气藏为主的浅层含气组合。深部断陷控制了深部组合气藏分布，坳陷构造层深湖相成熟烃源岩控制了下部、中部及上部组合油藏分布。

Three first-order stratigraphic sequences including rift, sag and reverse-abortion, and ten second-order stratigraphic sequences were developed in Songliao basin. Stratigraphic sequence of rift is dominated by volcanic reservoir, alluvial fan, fan delta and shore-shallow lake facies. Stratigraphic sequence of sag is dominated by fiver facies, large-scale delta and semi deep lake-deep lake facies. Stratigraphic sequence of reverse-abortion is dominated by fiver facies, small delta and shore-shallow lake facies. In the stratigraphic sequence of rift, coal source rock, glutenite and volcanic reservoir constitute the deep gas-bearing combination. In the stratigraphic sequence of sag, deep lake facies, large-scale delta and river facies sandstone constitute the middle and upper oil-beating combination, with oil and gas co-existing at the lower part. In the stratigraphic sequence of reverse- abortion, shoreshallow lake facies mudstone and river facies sandstone constitute the shallow gas-bearing combination, dominated by secondary gas reservoir and bioelimatic reservoir. Deep rift controls the distribution of gas reservoir of deep combination. Deep lake facies mature source rocks in stratigraphie sequence of sag control the distribution of hydrocarbon at the top, middle and lower part.