莺歌海盆地异常裂后沉降的动力学机制

被引:27
作者
崔涛
解习农
任建业
张成
机构
[1] 中国地质大学资源学院
关键词
莺歌海盆地; 构造沉降; 动力地貌; 异常沉降; 应变速率反演;
D O I
暂无
中图分类号
P618.13 [石油、天然气]; P542 [构造运动];
学科分类号
0709 ; 081803 ; 070904 ;
摘要
为了理解莺歌海盆地形成与演化的动力过程,用回剥法和应变速率反演方法对该区的钻井和地层剖面资料进行了研究.研究结果表明莺歌海盆地观测得到的裂后沉降和模拟预测的理论裂后沉降结果存在较大差异,其中在西北部为300~500m,中部和东南部为900~1200m,其异常裂后沉降明显呈现向东南和向海方向递大的趋势.地幔对流模型预测的结果表明,20Ma以来南海北部边缘的动力地貌沉降量为300m,因此,莺歌海盆地裂后异常沉降在300m左右的地区可以用动力地貌沉降机理来解释,但是盆地中部和东南部的巨厚的异常沉降远大于动力地貌沉降量,它是自晚中新世以来盆缘断层的右旋走滑作用、裂后热回沉和动力地貌沉降共同作用的结果.
引用
收藏
页码:349 / 356
页数:8
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