摘要
运用盆地分析的技术与方法,通过对渤海湾盆地西南部惠民凹陷典型剖面的回剥,揭示出惠民凹陷新生代构造演化规律,并对剖面上不同部位的沉降做出比较,进而反映该凹陷的构造沉降特征;同时,运用波动分析原理,得出反映凹陷形成与发展的主周期波为57Ma和7.5Ma。研究表明,孔店组-沙二段是惠民凹陷断层的主要活动期,控凹断层沉降峰值出现在孔店组沉积期,而控洼断层主要在沙四、沙三段沉降最为强烈;57Ma周期波正好与盆地总体构造旋回性一致;7.5Ma周期波与凹陷内拉张-沉降、不同沉积期间断面的剥蚀情况有较好的对应关系。
By using the techniques and methods of basin analysis, back stripping the typical profiles of Huimin Depression, the Cenozoic tectonic evolution rules of Huimin Depression were revealed, furthermore, the tectonic subsidence characters were shown up by contrasting the subsidence of different positions of profiles; and using the wave analysis method, the cyclic waves which reflected the formation and development of the depression was 57Ma and 7.5Ma. The results show that the main active periods of faults are from Kongdian Formation to Es2, and the subsidence peak value of the depression-controlled faults is taken place in Kongdian Formation, while Es4 and Es3 are the most powerful subsidence periods of sag controlled faults; the 57Ma cyclic wave is in accordance to the tectonic cycle of Bohai Bay Basin, and the 7.5Ma cyclic wave has a fine relationship with the extension-subsidence and erosion state of different sedimentary intervals of Huimin Depression.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2007年第5期1-7,共7页
Journal of Oil and Gas Technology
基金
"十五"国家重大科技攻关项目(2003BA613A)
关键词
惠民凹陷
平衡剖面
构造演化
沉降速率
伸展量
波动旋回
Huimin Depression
balanced section
tectonic evolution
subsidence rate
extension values
wave cycle
