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地球学报  2009 

陆相断陷盆地二级层序时限构造沉降与

DOI: 10.3975/cagsb.2009.02.06

Keywords: 陆相断陷盆地,构造沉降,层序地层,湖平面变化

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Abstract:

针对陆相断陷盆地构造沉降与湖平面变化的响应关系问题,笔者通过二维回剥分析,并引入沉降通量和沉降速率通量两个参数以评价盆地沉降的整体特征。黄骅坳陷中区东营组二级层序内三角洲体系发育,可细分为4个三级层序,构造沉降上呈减弱到增强的变化,并具有断陷作用逐渐减弱、坳陷作用加强的特点。拟合构造沉降、沉积演化、层序结构的关系表明,湖平面下降、三角洲的繁盛与快速构造沉降耦合一致,湖平面下降是不均衡的强烈构造沉降导致湖水体积向控凹断层或坳陷中心重新分配、且四周水系的补充滞后于构造沉降产生的新增可容纳空间的结果。相反,湖平面上升和深湖相发育与慢速构造沉降耦合一致。此外,湖平面变化与构造沉降总量的大小无关。

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