湖盆无曝露缓坡带层序界面特征及成因——以松辽盆地他拉哈地区上白垩统为例

永颉同心

摘　要：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.
关键词：层序地层;层序界面;成因分析;缓坡带;松辽盆地

基金项目：国家自然科学基金项目(批准号:40272057)资助.
作者简介：辛仁臣 男 1964年出生 副教授 层序地层学、沉积学
作者单位：辛仁臣（中国地质大学,海洋学院,北京,100083）　
　　　　　张雪辉（中国地质大学,海洋学院,北京,100083）　
　　　　　张翼（中国地质大学,海洋学院,北京,100083）　
　　　　　郭涛（中国地质大学,海洋学院,北京,100083）　
　　　　　张春卉（中国地质大学,海洋学院,北京,100083）
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