珠江口盆地白云凹陷深水扇沉积相特征

Sedimentary Facies Characters of Baiyun Depression Deep-Water Fan in Pearl River Mouth Basin

珠江口盆地深水扇的发现为中国油气勘探中的重大突破,并以其宏大的规模、典型的结构及巨大的勘探前景引起国内外的关注。在区域地质背景研究基础上,通过白云凹陷X-1气田岩石学特征、地球化学特征和地球物理特征研究,识别出该盆地内深水扇沉积体,将深水扇划分为内扇、中扇和外扇三个亚相和水道颗粒流、碎屑流、水道间、近源和远源浊流等微相。对各微相作了较为详细的描述,结果表明水道砂质碎屑流微相是最有利于优质储集砂体发育的沉积微相。在此基础上提出深水扇理想沉积模式。

The discovery of deep-water fan in Pearl river mouth basin become a breakthrough in chinese exploration activity. It has raised the concern both nationally and internationally for large-scale,typical structure and huge exploration potential,in this paper,on the basis of regional geological background research,through the studies of Petrology,geochemistry and geophysics feature in X-1 gas field,deep-water fan sedimentary bodies is identified,and it is divided into three subfacies and four microfacies,which are inner fan,middle fan,outer fan and grain flow,sandy debris flow,between channels,near-source or distal turbidity current,four microfacies have been gave a more detailed description also,Waterway with sandy debris flows are the most favorable microquality reservoir sands development microfacies,and the ideal model of deep-water fan is established.