刚果扇盆地X区块中新统深水沉积层序内部结构及划分

The internal structure and division of deep-water sequence of Miocene in the Block X of Congo Fan Basin

本文基于刚果X区块钻井及地震资料,对研究区中新统深水沉积地层的层序内部结构及界面特征进行了系统分析,指明刚果扇盆地中新统深水层序具有“二元结构”特征,其层序界面在地震资料上对应良好的地震反射特征,依据层序内部结构及层序界面特征,并结合西非海岸海平面变化曲线、西非板块构造活动等因素,在研究区中新统识别出2个二级层序和7个三级层序,为研究区中新统油气勘探搭建了具有指导生产意义的层序地层格架。

This article based on drilling and seismic data from Congo Block X,analyzed sequence internal structure and interface characteristics of Miocene in the study area.It is pointed out that Miocene deep-water sequence in Congo fan basin is with dual-structure,and the sequence interface corresponds to good seismic reflection on seismic data.Based on sequence internal structure and sequence interface characteristics,combined with West African coastal sea level and tectonic activity,2 second-order sequences and 7 third-order sequences were identified in Miocene,providing a sequence stratigraphic framework with guiding significance for oil and gas exploration in the study area.