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Characteristics and Genesis of Sequence Boundaries on Subaqueous Gentle Slope of Lacustrine Basin: a case study on Upper Cretaceous in Talaha region of Songliao Basin
Author(s): 
Pages: 77-85
Year: Issue:  1
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  层序地层层序界面成因分析缓坡带松辽盆地;
Abstract: 松辽盆地他拉哈地区在泉头组四段-嫩江组三段沉积时期为长期被湖水覆盖的缓坡带,层序地层学研究结果表明,层序界面在岩性-测井曲线特征上,有7种表现形式:(1)砂岩发育段内正反旋回的分界面;(2)砂岩发育段与含砂泥岩层(组)之间的正反旋回的分界面;(3)含砂泥岩层(组)与砂岩发育段之间的正反旋回的分界面;(4)钙质含量较高层段内正反旋回的分界面;(5)钙质含量较高的层(组)与含砂泥岩层(组)之间的正反旋回的分界面;(6)含砂泥岩层(组)与钙质含量较高的层(组)之间的正反旋回的分界面;(7)含砂泥岩层(组)内部的正反旋回的分界面.二级和三级层序界面以砂岩发育段内正反旋回的分界面为主,分别占92%和39%.四级层序,7种类型的界面出现的概率差别较小,表现形式具有真正的层序界面特征多样性.层序界面的特征取决于湖平面的升降、物源供应强度和蒸发作用的强度.
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