珠江口盆地番禺低隆起油气输导体系及运移脊线

目前勘探成果表明,番禺低隆起具有丰富的油气资源潜力,T5~T2都有油气显示。根据研究区主砂体的时空展布以及目前发现油气的主要层位,确定研究区油气主要输导层为T5、T4~T3、T3~T2三个层位。T5(18.5 Ma)以下珠海组发育三角洲-滨海沉积体系分布广泛,是油气长距离运移的输导体。T4(15.5 Ma)~T3(13.8 Ma),T3(13.8 Ma)~T2(10.0 Ma)发育的浅水三角洲、斜坡扇与低位进积复合体也是有利的油气储集体和侧向输导体。番禺低隆起广泛发育的第三系同沉积反向断层是油气运移的纵向输导体系。利用地震和钻井资料恢复了古构造格局并结合有机包裹体分析明确了油气运移脊线。断层-砂体输导层相互匹配,沿构造脊线呈立体网状阶梯式的运移是研究区油气输导体系最鲜明的特点。

Structure ridge and hydrocarbon migration pathway system of Panyu Low Uplift in the Pearl River Mouth Basin

The present exploration indicates that Panyu Low Massif has abundant oil-gas resource potential.According to the study of main sand space-time distribution and stratum of hydrocarbon finding in this area,we can confirm that three layers(T5,T4-T3,T3-T2) is the main stratum of hydrocarbon migration.The delta-strand deposit system which is developed in Zhuhai Group(T5 18.5 Ma) is the conductor department of hydrocarbon's long distance transport.Also the shallow water delta,slope fan developed in the stratum of T4(15.5 Ma)～T3(13.8 Ma),T3(13.8 Ma)～T2(10.0 Ma) is the favorable reservoir and conductor department.Panyu Low Massif extensively develops syndepositional reverse fault which is the conductor department of hydrocarbon vertical migration.Using earthquake and well datum recover the ancient structure pattern and combine organic fluid inclusion analysis we can open out the structure ridge of hydrocarbon migration.The type of pathway system that hydrocarbon migrates by fault-sand conductor along structure ridge in the form of three-dimensional netted ladder is the most distinct characteristic in this area.